Air Bag Restraint System

2003 ACCESSORIES/SAFETY EQUIPMENT

General Motors Corp. - Air Bag Restraint Systems

DESCRIPTION & OPERATION

Supplemental Inflatable Restraint (SIR) system is designed to supplement protection provided by driver-side and passenger-side seat belts. A frontal collision of sufficient force will deploy driver-side and passenger-side air bag modules. Steering column and knee bolsters also absorb collision energy. SDM maintains a 23 Volt Loop Reserve (VLR) to deploy air bag modules for up to one minute after loss of battery voltage.

SIR system consists of Sensing and Diagnostic Module (SDM), driver-side and passenger-side single stage or dual stage air bag modules, passenger-side air bag module disable switch, front end discriminating sensor, also known as Electronic Frontal Sensor (EFS), driver and passenger front Seat Position Sensors (SPS), Passenger Presence System (PPS), SIR coil assembly and AIR BAG warning light.

COMPONENT LOCATIONS

COMPONENT LOCATIONS

SYSTEM OPERATION CHECK

If SIR system is functioning normally, AIR BAG warning light flashes 7 times and then turns off when ignition is turned on. System malfunction is indicated when light does not illuminate at all, light comes on while vehicle is driven, light flashes 7 times and remains on or light does not flash but remains on when ignition is turned on.

AIR BAG SAFETY PRECAUTIONS

Observe the following precautions when working with SIR system:

WARNING: Accidental air bag deployment is possible. Personal injury may result. To avoid accidental air bag deployment or injury, read and carefully follow all WARNINGS and AIR BAG SAFETY PRECAUTIONS .

Component LocationAIR BAG warning light Instrument Panel Cluster (IPC)Driver-side air bag module On steering wheelElectronic Frontal Sensors (EFS) Lower frame railPassenger Presence Detection (PPD) switch Under passenger front seatPassenger-side air bag module Passenger-side of instrument panelPassenger-side air bag module disable switch Center of instrument panelSeat Position Sensors (SPS) Under driver and front passenger seatSensing & Diagnostic Module (SDM) Under driver seatSIR coil assembly Under steering wheel

2003 Chevrolet Silverado 1500

2003 ACCESSORIES/SAFETY EQUIPMENT General Motors Corp. - Air Bag Restraint Systems



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April-29-08 2:09:43 PM Page 1 2005 Mitchell Repair Information Company, LLC.

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SDM maintains sufficient voltage to cause air bag deployment for up to one minute after ignition is turned off, battery is disconnected or fuse powering SDM is removed. Disable air bag system before working on vehicle. See DISABLING & ACTIVATING AIR BAG SYSTEM . If vehicle interior is exposed to moisture and becomes soaked up to level of SDM, SDM and harness connector must be replaced. SDM could be activated when powered, causing air bag deployment. After repairs, ensure AIR BAG warning light is working properly and no system faults are indicated. See SYSTEM OPERATION CHECK . Always wear safety glasses when servicing or handling an air bag module. Air bag modules must be stored in original special containers until used for service. Store in a clean, dry place, away from sources of extreme heat, sparks, or high electrical energy. SIR components should not be subjected to temperatures greater than 150F (65C). SIR components should not be used if they have been dropped from a height of 3 feet (0.9 m) or more. When placing a live air bag module on a bench or other surface, always make certain that trim cover faces up. This will reduce motion of module if accidentally deployed. After deployment, air bag surface may contain deposits of sodium hydroxide, which can irritate skin. Always wear safety glasses, rubber gloves and long-sleeved shirt during clean-up and wash hands using mild soap and water. Follow correct disposal procedures. See DISPOSAL PROCEDURES . At no time should any electrical source be allowed near inflator on back of air bag module. DO NOT apply power to SIR system unless all components are connected or a diagnostic chart requests it, as this will set a Diagnostic Trouble Code (DTC). When carrying a live air bag module, trim cover should be pointed away from body to minimize injury in case of accidental deployment. DO NOT service SIR components. If defective, components must be replaced. DO NOT probe a wire through insulator. Wire will be damaged and eventually fail due to corrosion. When performing electrical tests, prevent accidental shorting of terminals. Such mistakes can damage fuses or components and may cause a second Diagnostic Trouble Code (DTC) to set, making diagnosis of original problem more difficult. When using diagnostic charts to diagnose SIR system, under no circumstances should a volt/ohmmeter, test light or any type of electrical equipment not specified by manufacturer be used. If SIR system is not fully functional for any reason, vehicle should not be driven until system is repaired. DO NOT remove bulbs, modules, sensors or other components or in any way disable system from operating normally.

ADJUSTMENTS

CENTERING SIR COIL ASSEMBLY

With Centering Window & Service Lock

Hold SIR coil face up. See Fig. 1 . While depressing service lock, rotate coil hub clockwise until it stops. Rotate coil hub counterclockwise slowly until centering window appears Yellow and line-up marks are aligned. Release service lock.



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With Centering Window & No Service Lock

Hold SIR coil face up. See Fig. 1 . Rotate coil hub clockwise until it stops. Rotate coil hub counterclockwise slowly until centering window appears Yellow and both line-up marks are aligned. Prevent coil hub from moving until installed on steering column.

With Service Lock And & Centering Window

Hold SIR coil assembly with rear side facing up. See Fig. 1 . While depressing service lock, rotate coil hub in direction indicated by directional arrow until it stops. Rotate coil hub in opposite direction 2 1/2 turns. Release service lock.

Without Centering Window & Service Lock

Hold SIR coil assembly face up. See Fig. 1 . Rotate coil hub in direction of arrow until it stops. Rotate coil hub in opposite direction 2 1/2 turns. Prevent coil hub from moving until installed on steering column.



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Fig. 1: Identifying SIR Coil Assembly TypesCourtesy of GENERAL MOTORS CORP.

DISABLING & ACTIVATING AIR BAG SYSTEM

Fig. 2: Identifying SRS Component Disabling & Activating Zones (Typical) Courtesy of GENERAL MOTORS CORP.

DISABLING SYSTEM

NOTE: SIR components are placed in various zones. Work being performed will determine applicable disabling and activating procedure. See REMOVAL & INSTALLATION . To identify disabling and activating component zones, refer to illustration. See Fig. 2 .

WARNING: Accidental air bag deployment is possible. Personal injury could occur. Read and follow service precautions. See AIR BAG SAFETY PRECAUTIONS .

NOTE: When SIR fuse is removed and ignition is on, AIR BAG warning light will be on.



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Zone 1

1. Turn steering wheel to place vehicle wheels in straight-ahead position. Turn ignition off and remove key. Remove SIR fuse (15-amp) from underhood fuse block.

2. Remove Connector Position Assurance (CPA) clips from driver-side and passenger-side Electronic Frontal Sensors (EFS), also known as front end discriminating sensors. Disconnect both EFS connectors.

Fig. 3: Identifying Electronic Frontal Sensor (EFS) Courtesy of GENERAL MOTORS CORP.

This does not indicate a system malfunction.



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Zone 3


2. Remove Connector Position Assurance (CPA) clip from driver-side air bag module connector. See Fig. 4 . Disconnect driver-side air bag module connector.

Fig. 4: Identifying Driver-side Air Bag Module Connector Courtesy of GENERAL MOTORS CORP.



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Zone 5


2. Remove Connector Position Assurance (CPA) clip from passenger-side air bag module connector. See Fig. 5 . Disconnect passenger-side air bag module connector.

Fig. 5: Identifying Passenger-side Air Bag Module Connector Courtesy of GENERAL MOTORS CORP.

Zone 7


2. Remove Connector Position Assurance (CPA) clip from driver-side air bag module connector. See Fig.



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4 . Disconnect driver-side air bag module connector. 3. Remove Connector Position Assurance (CPA) clip from passenger-side air bag module connector. See

Fig. 5 . Disconnect passenger-side air bag module connector.

ACTIVATING SYSTEM

Zone 1

1. Ensure ignition is off and key is removed. Connect driver-side and passenger-side front end discriminating sensor connectors, also known as Electronic Frontal Sensors (EFS). Install Connector Position Assurance (CPA) clips.

2. Install SIR fuse in underhood fuse block. Staying well away from air bag modules, turn ignition on. Check air bag system for proper operation. See SYSTEM OPERATION CHECK .

Zone 3

1. Ensure ignition is off and key is removed. Connect driver-side air bag module connector. See Fig. 4 . Install Connector Position Assurance (CPA) clip.


Zone 5

1. Ensure ignition is off and key is removed. Connect passenger-side air bag module connector. See Fig. 5 . Install Connector Position Assurance (CPA) clip.


Zone 7

1. Ensure ignition is off and key is removed. Connect driver-side air bag module connector. See Fig. 4 . Install Connector Position Assurance (CPA) clip.

2. Connect passenger-side air bag module connector. See Fig. 5 . Install Connector Position Assurance (CPA) clip.


DISPOSAL PROCEDURES

WARNING: Accidental air bag deployment is possible. Personal injury may result. Read and follow service precautions. See AIR BAG SAFETY PRECAUTIONS .

NOTE: If vehicle is to be scrapped, perform on-vehicle air bag deployment procedure. See ON-VEHICLE DEPLOYMENT . If vehicle will remain in service, perform off-



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ON-VEHICLE DEPLOYMENT

Single Stage AIR Bag Modules

1. Before proceeding, see AIR BAG SAFETY PRECAUTIONS . Turn ignition off and remove key. Put on safety glasses.

2. Disconnect driver-side and passenger-side air bag module connectors. See Fig. 4 & Fig. 5 . Cut air bag module harness connectors from vehicle leaving at least 6" (152 mm) of wire at each connector.

3. Strip 0.50" (13 mm) of insulation from each connector wire lead. Cut two 15-foot (4.6 m) deployment wires from 18-gauge multi-strand wire. Strip 0.50" (13 mm) of insulation from both ends of wires. Twist wires together at one end to short.

4. Twist together one connector wire lead to other end of each deployment wire. See Fig. 6 . Bend twisted connection flat and wrap tightly with electrical tape to insulate. Repeat this step for other connector wire lead.

5. Remove all loose objects from front seat. Ensure no one is in vehicle. Connect deployment wire connector to driver-side air bag module connector. Stretch wires away from car as far as possible.

6. Repeat steps 3 through 5 for passenger-side air bag module. Cover windshield and front door openings with a drop cloth.

7. Separate wire ends. Connect each pair of wires to a 12-volt battery. Air bag modules should deploy. If air bag modules did not deploy, go to next step. If air bag modules did deploy, disconnect deployment wires from battery. DO NOT touch air bag module area for at least 10 minutes due to heat generated during deployment. Wear gloves and safety glasses before handling deployed air bag module. Wash hands with mild soap and water afterwards.

8. If air bag modules DO NOT deploy, carefully remove from vehicle. See AIR BAG MODULES under REMOVAL & INSTALLATION. Temporarily store air bag module with trim facing up. Contact manufacturer for additional instructions.

vehicle deployment procedure. See OFF-VEHICLE DEPLOYMENT .



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Fig. 6: Preparing Deployment Harness For Driver-side & Passenger-side On-vehicle Deployment Courtesy of GENERAL MOTORS CORP.

Dual Stage AIR Bag Modules



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1. Before proceeding, see AIR BAG SAFETY PRECAUTIONS . Disable air bag system. See DISABLING & ACTIVATING AIR BAG SYSTEM . Put on safety glasses.

2. Cut air bag module harness connectors from vehicle leaving at least 6" (152 mm) of wire at the connector for each wire lead. See Fig. 4 & Fig. 5 . Strip 0.50" (13 mm) of insulation from each wire lead to the connector. Cut 2 deployment wires at least 15 feet (4.6 m) long from 18-gauge multi-strand wire. Strip 0.50" (13 mm) of insulation from each connector wire lead. Twist wires together at one end to short.

3. Twist together wires for driver-side Stage 1 and Stage 2 high-side deployment loops. See WIRING DIAGRAMS . Connect twisted wire pair to end of one deployment wire. See Fig. 7 . Bend twisted connection flat and wrap tightly with electrical tape. Repeat procedure for driver-side Stage 1 and Stage 2 low-side deployment loop leads. Repeat for passenger-side air bag module connector.

4. Remove all loose objects from front seat. Ensure no one is in vehicle. Connect deployment harnesses to driver-side and passenger-side air bag module connectors. Stretch wires away from vehicle as far as possible. Cover windshield and front door openings with a drop cloth. Separate driver-side air bag module deployment harness wire ends. Connect driver-side air bag module deployment lead wires to a 12-volt battery. Driver-side air bag module should deploy. Repeat procedure for passenger-side air bag module.

5. If either air bag module does not deploy, go to next step. If air bag modules did deploy, disconnect wires from battery. DO NOT touch metal surfaces of air bag module for at least 10 minutes due to heat generated during deployment. Wear gloves and safety glasses when handling deployed air bag modules. Wash hands with mild soap and water.

6. Carefully remove non deployed air bag modules from vehicle. See AIR BAG MODULES under REMOVAL & INSTALLATION. Temporarily store module with trim cover facing up. Contact manufacturer for additional instructions.



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Fig. 7: Preparing Deployment Harness For Driver-side & Passenger-side Dual Stage Air Bag Module Deployment Courtesy of GENERAL MOTORS CORP.

OFF-VEHICLE DEPLOYMENT

1. Before proceeding, see AIR BAG SAFETY PRECAUTIONS . Turn ignition off and remove key. Put on safety glasses. Short 2 SIR Deployment Harness (J-38826) leads together by fully seating one banana plug into the other. Connect appropriate pigtail adapter to SIR deployment harness. See Fig. 8 .

2. Remove driver-side air bag module. See AIR BAG MODULES under REMOVAL & INSTALLATION. Place driver-side air bag module in center of a cleared area, at least 6 feet (1.8 m) in diameter (preferably paved surface outdoors), with vinyl trim cover facing up, away from any loose or flammable objects. Extend SIR deployment harness and pigtail adapter to full length away air bag module. Place a 12-volt battery near shorted end of SIR deployment harness.



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3. Connect air bag module to SIR deployment harness using pigtail adapter. Ensure area around driver-side air bag module is clear of people or loose objects. Verify that air bag module is resting with trim cover facing up.

4. Separate 2 banana plugs on SIR deployment harness. Connect SIR deployment harness wires to battery. Air bag module should deploy immediately. If air bag module does not deploy, go to step 6 . If air bag module did deploy, disconnect SIR deployment harness from battery. Short 2 SIR deployment harness leads together.

5. DO NOT touch metal surfaces of air bag module for at least 10 minutes due to heat generated during deployment. Wear gloves and safety glasses when handling deployed air bag module. Wash hands with mild soap and water after handling. Using Deployment Fixture (J-39401-B) to hold passenger-side air bag module, repeat deployment procedure. Dispose of deployed air bag modules as you would any other part. Inspect pigtail adapter and SIR deployment harness for damage after each use.

6. If air bag module fails to deploy, ensure that SIR deployment harness is disconnected from battery and that 2 banana plugs have been shorted together. Disconnect pigtail adapter from air bag module. Temporarily store air bag module with trim cover facing up. Contact manufacturer for additional instructions.

Fig. 8: Preparing Deployment Harness For Off-vehicle Deployment Courtesy of GENERAL MOTORS CORP.

POST-COLLISION INSPECTION



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When a vehicle has been involved in a collision, certain components of the passive restraint system must be inspected or replaced. See AIR BAG/SRS COMPONENT INSPECTION & REPLACEMENT TABLES article in the GENERAL INFORMATION section.

REMOVAL & INSTALLATION

AIR BAG MODULES

Removal & Installation (Driver-side)

1. Before proceeding, see AIR BAG SAFETY PRECAUTIONS . Disable air bag system. See ZONE 3 under DISABLING & ACTIVATING AIR BAG SYSTEM.

2. Turn steering wheel 90 degrees to gain access to rear steering wheel holes. Insert flat-blade screw driver into each hole and push leaf springs to release air bag module retaining pins. See Fig. 9 . Turn steering wheel 180 degrees to access remaining 2 holes. Pull air bag module away from steering wheel. Disconnect air bag wire module wire harness from clips on air bag module and steering wheel. Remove Connector Position Assurance (CPA) clips from driver-side air bag module connectors. Disconnect connectors. Remove driver-side air bag module.

3. To install, reverse removal procedure. Ensure leaf springs are securely connected on all notched pins. Activate air bag system. See ZONE 3 under DISABLING & ACTIVATING AIR BAG SYSTEM.

WARNING: Accidental air bag deployment is possible. Personal injury may result. Read and follow service precautions.



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Fig. 9: Identifying Driver-side Air Bag Module Leaf Spring & Pin Courtesy of GENERAL MOTORS CORP.

Removal & Installation (Passenger-side)


2. Remove instrument panel upper trim pad. See INSTRUMENT PANEL UPPER TRIM PAD . Remove Connector Position Assurance (CPA) clip from passenger-side air bag module connector. See Fig. 5 . Disconnect passenger-side air bag module connector. Remove passenger-side air bag module bolts. Remove passenger-side air bag module from instrument panel. See Fig. 10 .

3. To install, reverse removal procedure. Tighten passenger-side air bag module bolts and trim panel screws to specification. See TORQUE SPECIFICATIONS . Activate air bag system. See ZONE 5 under DISABLING & ACTIVATING AIR BAG SYSTEM.



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Fig. 10: Identifying Passenger-side Air Bag Module Courtesy of GENERAL MOTORS CORP.

ELECTRONIC FRONTAL SENSOR (EFS) (PASSENGER-SIDE)

Removal & Installation

NOTE: Electronic Frontal Sensor (EFS) is also known as front end discriminating sensor.



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2. Loosen mounting bolt from applicable EFS. See Fig. 3 . Remove EFS and mounting bolt. 3. To install, reverse removal procedure. Tighten EFS mounting bolt to specification. See TORQUE

SPECIFICATIONS . Activate air bag system. See ZONE 1 under DISABLING & ACTIVATING AIR BAG SYSTEM.

INSTRUMENT PANEL CLUSTER (IPC)


Before proceeding, see AIR BAG SAFETY PRECAUTIONS . Remove Instrument Panel Cluster (IPC) trim plate by pulling gently rearward on corners of trim plate. Remove IPC retaining screws. Remove IPC from instrument panel by tilting bottom of IPC upward. Disconnect IPC electrical connector. To install, reverse removal procedure. Tighten IPC retaining screws to specification. See TORQUE SPECIFICATIONS .

INSTRUMENT PANEL UPPER TRIM PAD


1. Before proceeding, see AIR BAG SAFETY PRECAUTIONS . Set parking brake. On models with automatic transmission, move shift lever to down-most position. On all models, tilt steering wheel to full down position.

2. Remove Instrument Panel Cluster (IPC) trim plate by pulling gently rearward on corners of trim plate. Remove left and right instrument panel end panels. Remove passenger-side air outlets. Remove assist handle by depressing release tabs accessed through air outlet duct holes.

3. Remove driver-side and passenger-side A-pillar trim. Remove screws from instrument panel upper trim pad. Lift upper trim pad up. Disconnect ambient light sensor electrical connector. Remove instrument panel upper trim pad. See Fig. 11 .

4. To install, reverse removal procedure. Tighten instrument panel upper trim pad screws to specification. See TORQUE SPECIFICATIONS .



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Fig. 11: Identifying Instrument Panel Upper Trim Pad Courtesy of GENERAL MOTORS CORP.

PASSENGER PRESENCE SYSTEM (PPS)


1. Before proceeding, see AIR BAG SAFETY PRECAUTIONS . Remove front passenger seat cushion trim cover and pad.

2. Disconnect electrical connectors. Remove screws retaining PPS ECU to bottom of passenger seat frame. See Fig. 12 . Remove pressure switch from bottom of seat frame. Remove push in retainers that secure PPS bladder to seat cushion frame. See Fig. 13 . Remove PPS system from seat.

3. To install, reverse removal procedure. Tighten PPS ECU screws to specification. See TORQUE SPECIFICATIONS . Rezero PPS. See PASSENGER PRESENCE SYSTEM REZEROING PROCEDURE under DIAGNOSTICS. Check system for proper operation. See SYSTEM OPERATION CHECK .

NOTE: Replace PPS as a complete assembly, using all parts provided in service kit.



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Fig. 12: Identifying Passenger Presence System (PPS) ECU Courtesy of GENERAL MOTORS CORP.



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Fig. 13: Identifying PPS Bladder Courtesy of GENERAL MOTORS CORP.

PASSENGER-SIDE AIR BAG DISABLE SWITCH


1. Before proceeding, see AIR BAG SAFETY PRECAUTIONS . Ensure ignition is off and key is removed. Remove Instrument Panel Cluster (IPC) trim plate by pulling gently rearward on corner of trim plate.

2. Remove passenger-side air bag disable switch from instrument panel. See Fig. 14 . Disconnect electrical connector from rear of air bag disable switch. To install, reverse removal procedure.



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Fig. 14: Identifying Passenger-side Air Bag Module Disable Switch Courtesy of GENERAL MOTORS CORP.

REAR VIEW MIRROR


1. Remove wire harness cover from lighted rear view mirror cover, if equipped. Using a small flat-blade screwdriver, remove rear view mirror from rear view mirror support. Disconnect electrical connectors. Remove rear view mirror.

2. To install, reverse removal procedure. Calibrate mirror. See COMPASS CALIBRATION & COMPASS MAGNETIC VARIATION ADJUSTMENT .

SEAT BELT RETRACTOR



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1. Move applicable front seat to full forward position. Remove seat back cover and pad. Separate seat foam from cardboard to gain access to retainer on side of seat belt.

2. Remove seat belt side cardboard retainers. Move cardboard outwards to gain access to lower seat belt retractor bolt. Remove seat belt retractor lower bolt. See Fig. 15 . Remove retractor tower retaining screw. Remove retractor tower cover. See Fig. 16 .

3. Remove upper anchor bolt. See Fig. 17 . Remove seat belt retractor from seat. 4. To install, reverse removal procedure. Tighten upper and lower retractor retainer bolts and tower cover

screw to specification. See TORQUE SPECIFICATIONS .



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Fig. 15: Identifying Seat Belt Retractor Courtesy of GENERAL MOTORS CORP.

Fig. 16: Identifying Retractor Tower Cover Courtesy of GENERAL MOTORS CORP.



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Fig. 17: Identifying Upper Anchor Bolt Courtesy of GENERAL MOTORS CORP.

SEAT POSITION SWITCH (SPS)


1. Before proceeding, see AIR BAG SAFETY PRECAUTIONS . Disconnect applicable under seat electrical connectors. Remove seat bolts and nuts. Remove seat from vehicle.

2. Disconnect electrical connector from SPS. See Fig. 18 . Drill out rivets that retain SPS to seat track.



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Remove SPS. 3. To install, reverse removal procedure. Tighten seat mounting bolts and nuts to specification. See

TORQUE SPECIFICATIONS .

Fig. 18: Identifying Seat Position Switch (SPS) Courtesy of GENERAL MOTORS CORP.

SENSING & DIAGNOSTIC MODULE (SDM)



2. Disconnect driver seat electrical connectors. Remove driver seat bolts and nuts. Remove driver seat. Remove driver-side door sill plate. Fold back carpet to access SDM. See Fig. 19 . Remove Connector Position Assurance (CPA) clip from SDM connector. Disconnect SDM connector. Remove SDM mounting nuts. Remove SDM.



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3. To install, reverse removal procedure. Tighten SDM nuts and driver seat bolts and nuts to specification. See TORQUE SPECIFICATIONS . Activate air bag system. See ZONE 7 under DISABLING & ACTIVATING AIR BAG SYSTEM.

Fig. 19: Identifying Sensing & Diagnostic Module (SDM) Courtesy of GENERAL MOTORS CORP.

SIR COIL ASSEMBLY



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2. Remove driver-side air bag module. See AIR BAG MODULES . Remove steering wheel. See STEERING WHEEL . Remove upper and lower steering column covers.

3. Remove wire harness assembly from wire harness strap. Remove wire harness straps from wire harness. See Fig. 20 . Disconnect SIR coil connector. Remove retaining ring. Remove SIR coil assembly. Remove wave washer.

4. To install, reverse removal procedure. If necessary, center SIR coil assembly. See CENTERING SIR COIL ASSEMBLY under ADJUSTMENTS. Tighten steering column cover screws and steering wheel nut to specification. See TORQUE SPECIFICATIONS . Activate air bag system. See ZONE 3 under DISABLING & ACTIVATING AIR BAG SYSTEM.

NOTE: New coil assemblies are pre-centered and include a centering tab that is removed once coil is installed.



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Fig. 20: Identifying SIR Coil Assembly Courtesy of GENERAL MOTORS CORP.

STEERING WHEEL





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2. Remove driver-side air bag module. See AIR BAG MODULES . Remove horn contact from steering column. Remove steering wheel nut. Scribe a mark on steering wheel and steering wheel shaft for use during installation. Using Steering Wheel Puller (J-1859-A), remove steering wheel.

3. To install, reverse removal procedure. Tighten steering wheel nut to specification. See TORQUE SPECIFICATIONS . Activate air bag system. See ZONE 3 under DISABLING & ACTIVATING AIR BAG SYSTEM.

DIAGNOSTICS

DIAGNOSTIC TROUBLE CODES (DTC'S)

Sensing & Diagnostic Module (SDM) provides a record of each DTC, stored according to type. SDM performs diagnostic monitoring of SIR system electrical components and sets a DTC when a malfunction is detected. Current DTC's are stored in SDM and are erased when fault is corrected. Current DTC's can be read using a scan tool such as Tech 2.

SCAN TOOL DIAGNOSTICS

Scan Tool (Tech 2) reads and clears current and history codes. Ensure scan tool contains correct software cartridge for SIR diagnostics. To use scan tool, connect it to Data Link Connector (DLC), located near base of steering column. Plug in power source and turn ignition on. Follow scan tool manufacturer instructions for communication with SIR system.

DIAGNOSTIC PROCEDURES

Diagnostic procedures are designed to find and repair SIR malfunctions. It is important to use diagnostic tests and follow sequence listed below:

Perform SIR Diagnostic System Check

SIR diagnostic system check should always be starting point for any SIR diagnostics. It checks for proper AIR BAG warning light operation and DTC's using both flash code and scan tool methods. See SIR DIAGNOSTIC SYSTEM CHECK .

Refer To Proper Diagnostic Test

SIR diagnostic system check indicates correct test to diagnose SIR problems. Bypassing procedures may result in extended diagnostic time, incorrect diagnosis and incorrect parts replacement.

Repeat SIR Diagnostic System Check

Performing SIR diagnostic system check after all repair or diagnostic procedures ensures that repair has been

WARNING: Accidental air bag deployment is possible. Personal injury may result. Read and follow service precautions. See AIR BAG SAFETY PRECAUTIONS .



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made correctly and that no other conditions exist.

SIR DIAGNOSTIC SYSTEM CHECK

Diagnostic Procedure

1. Observe AIR BAG warning light when turning ignition on. If AIR BAG warning light flashes 7 times, go to next step. If AIR BAG warning light does not flash 7 times, inspect vehicle for damage to wiring system, visible body damage, faulty or intermittent electrical connections or addition of aftermarket devices which could affect SIR operation. Diagnose AIR BAG warning light malfunction. See AIR BAG WARNING LIGHT CIRCUIT MALFUNCTION .

2. Install scan tool to Data Link Connector (DLC), located under left side of instrument panel. If scan tool powers up, go to next step. If scan tool does not power up, inspect and repair data link communication circuits.

3. If scan tool communicates with SDM, go to next step. If scan tool does not communicate with SDM, inspect and repair data link communications circuits.

4. Using scan tool, request SIR DTC display. If scan tool displays history or current SIR DTC's, go to next step. If scan tool does not display any SIR DTC's, system is okay.

5. If scan tool displays any DTC's that begin with "U", inspect and repair applicable data link communication circuits and components. If no DTC's are displayed that begin with "U", go to next step.

6. If scan tool displays DTC B1000, go to DTC B1000 . If scan tool does not display DTC B1000, go to next step.

7. If scan tool displays DTC B0092 or B0098, go to next step. If scan tool displays other DTC's, diagnose and repair applicable SIR DTC's. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION table.

8. Using scan tool, request PPS to flash DTC's several times. See PASSENGER PRESENCE FLASH CODE PROCEDURE . If PPS flashes any current or history DTC's, diagnose and repair applicable SIR DTC's. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION table.

PASSENGER PRESENCE FLASH CODE PROCEDURE

Circuit Description

When ignition is turned on, Sensing and Diagnostic Module (SDM) performs tests to diagnose critical internal malfunctions. When SDM has completed power up mode, SDM will establish communication with Passenger Presence System (PPS). PPS will respond by performing diagnostic tests to check for proper circuit continuity and for shorts to ground or voltage with PPS. If PPS detects a malfunction, PPS will set a Diagnostic Trouble Code (DTC) and send a message to SDM, requesting that SDM disable passenger-side air bag module deployment loop.

NOTE: If may be necessary to request Passenger Presence System (PPS) to flash DTC's more than once. To ensure no DTC's are present, perform following procedure several times.



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Action Taken

SDM disables passenger-side air bag module deployment loop, sets DTC B0092 or B0098 and turns on AIR BAG warning light.

Flash Code Procedure

1. Ensure passenger front seat is empty. Install scan tool to Data Link Connector (DLC), located under left side of instrument panel.

2. Turn ignition on. Using scan tool, request PPS to flash DTC's. When PPS receives a valid request to flash DTC's PPS will do the following:

Illuminate both PASSENGER AIR BAG ON and OFF indicators, located on inside rear view mirror, for one second. Turn off both PASSENGER AIR BAG ON and OFF indicators for one second. Flash the first digit of DTC using the OFF indicator. Count number of flashes to determine first DTC digit. Flash the second digit of DTC using ON indicator. Count number of flashes to determine second DTC digit. When flashing procedure is initiated, PPS will flash all current and history DTC's. After all DTC's have been flashed, PPS will re-flash DTC's that are stored as current DTC's. Any DTC that is not re-flashed is a history DTC.

3. If flashing procedure was unsuccessful, repeat flashing procedure. Due to communication status between SDM and PPS, procedure may need to be repeated until a successful flash sequence has been achieved. Diagnose and repair applicable SIR DTC's. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION table.

COMPASS CALIBRATION & COMPASS MAGNETIC VARIATION ADJUSTMENT

Compass Calibration

1. Ensure mirror has correct compass variation zone number. See COMPASS MAGNETIC VARIATION ADJUSTMENT .

2. Start engine. Locate compass switch button. Depending on mirror model, switch button will be marked with COMP, COMPASS or ON/OFF. Press and hold switch button until "C" or "CAL" is displayed in mirror.

3. Drive vehicle in circles at a speed less than 5 mph (8 km/h) until "C" or "CAL" is replaced by a proper vehicle heading. Calibration is complete.

Compass Magnetic Variation Adjustment

NOTE: Before calibrating compass, drive vehicle to an area that is magnetically clean and free of large metallic objects such as high tension wires or steel buildings. Ensure there are no magnetized items on inside or outside of vehicle near mirror.



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1. Locate current geographic location (zone map) using world magnetic variation map. See Fig. 21 . Locate compass switch button. Depending on mirror model, switch button will be marked with COMP, COMPASS or ON/OFF.

2. Turn ignition on, with engine off. Press and hold switch until a zone number appears on compass display. Depress compass switch to select desired zone map number. Wait 5 seconds. Mirror display will return to a compass reading. Variance procedure is complete. Calibrate compass. Go to COMPASS CALIBRATION .

Fig. 21: Identifying Compass Variation Zones Courtesy of GENERAL MOTORS CORP.

PASSENGER PRESENCE SYSTEM REZEROING PROCEDURE

Rezeroing Procedure

1. Ensure passenger front seat is empty. Verify that all SIR and PPS components, connectors and Connector Position Assurance (CPA) clips are installed correctly. Install scan tool to Data Link Connector (DLC), located under left side of instrument panel.

NOTE: Rezeroing procedure must be completed whenever PPS has been serviced or components have been replaced. Read all instructions carefully before beginning procedure.



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2. Turn ignition on. Using scan tool, clear SIR and PPS DTC's. Request PPS rezeroing procedure using scan tool.

3. When rezeroing procedure is initiated, PPS will illuminate both PASSENGER AIR BAG ON and OFF indicators, located on rear view mirror until rezeroing procedure in completed:

When rezeroing procedure has been successfully completed, PPS will display current system status in rear view mirror indicator. If rezeroing procedure was unsuccessful, both PASSENGER AIR BAG ON and OFF indicators, located on rear view mirror will alternate from no illumination to full illumination in one second intervals for 5 seconds. PPS will treat an unsuccessful rezero attempt as a system fault.

4. If rezeroing procedure was unsuccessful, repeat this procedure. Due to communication status between SDM and PPS, rezeroing procedure may need to be repeated until a successful flash sequence has been achieved. Go to SIR DIAGNOSTIC SYSTEM CHECK .

DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION

NOTE: All SIR and PPS DTC's must be cleared before rezeroing PPS. Presence of current or history DTC's will prevent PPS from rezeroing.

Trouble Code Possible Cause023 Passenger seat belt tension retractor sensor signal voltage low or high024 PPS detects low voltage033 Disable switch voltage high or low063 PPS out of calibration064 PPS has lost communication with SDM065 PPS voltage out of rangeB0012 Passenger stage 2 deployment loop resistance lowB0013 Passenger stage 2 deployment loop resistance highB0014 Passenger stage 2 deployment loop voltage short to ground or voltageB0016 Passenger stage 1 deployment loop resistance lowB0017 Passenger stage 1 deployment loop resistance highB0018 Passenger stage 1 deployment loop voltage short to ground or voltageB0022 Driver stage 1 deployment loop resistance lowB0024 Driver stage 1deployment loop short to ground or voltageB0026 Driver stage 1 deployment loop resistance highB0042 Driver stage 2 deployment loop resistance lowB0043 Driver stage 2 deployment loop short to ground or voltageB0044 Driver stage 2 deployment loop resistance highB0051 Deployment commandedB0053 Deployment commanded with loop malfunctionB0083 Passenger SPS circuit amperage out of rangeB0084 Driver SPS circuit amperage out of rangeB0092 Incorrect PPS verification identificationB0098 Incorrect PPS verification identification



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CONNECTOR IDENTIFICATION

Fig. 22: Identifying SDM Connector Terminals Courtesy of GENERAL MOTORS CORP.

B0100 Driver-side EFS valid identification not receivedB0101 Driver-side EFS NOK messageB0102 Driver-side EFS incorrect identification messageB0103 Passenger-side EFS valid identification not receivedB0104 Passenger-side EFS NOK messageB0105 Passenger-side EFS incorrect identification messageB1000 SDM malfunctionB1001 Option configuration error

NOTE: Refer to illustrations to identify SIR connector terminals. See Fig. 22 , Fig. 23 , Fig. 24 , Fig. 25 , Fig. 26 , Fig. 27 , Fig. 28 , Fig. 29 , Fig. 30 & Fig. 31 .



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Fig. 23: Identifying Front End Discriminating Sensor Connector Terminals Courtesy of GENERAL MOTORS CORP.



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Fig. 24: Identifying Driver-side Dual Stage Air Bag Module Connector Terminals Courtesy of GENERAL MOTORS CORP.



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Fig. 25: Identifying Passenger-side Dual Stage Air Bag Module Connector Terminals Courtesy of GENERAL MOTORS CORP.



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Fig. 26: Identifying Driver-side Single Stage Air Bag Connector Terminals Courtesy of GENERAL MOTORS CORP.



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Fig. 27: Identifying Seat Position Sensor (SPS) Connector Terminals Courtesy of GENERAL MOTORS CORP.



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Fig. 28: Identifying Passenger Seat Belt Tension Retractor Sensor Connector Terminals Courtesy of GENERAL MOTORS CORP.



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Fig. 29: Identifying Passenger Presence Detection (PPD) Sensor Connector Terminals Courtesy of GENERAL MOTORS CORP.



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Fig. 30: Identifying Passenger Presence Detection (PPD) ECU Connector Terminals Courtesy of GENERAL MOTORS CORP.

Fig. 31: Identifying Passenger-side Air Bag Module Disable Switch Connector Terminals Courtesy of GENERAL MOTORS CORP.

DIAGNOSTIC TESTS

AIR BAG WARNING LIGHT CIRCUIT MALFUNCTION



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Circuit Description

When ignition is turned on, Sensing and Diagnostic Module (SDM) commands Instrument Panel Cluster (IPC) to flash AIR BAG warning light 7 times while SDM checks SIR system for malfunctions. If SIR system is okay, AIR BAG warning light will then turn off.

Diagnostic Aids

If ignition voltage is outside normal operating range, (9-16 volts), AIR BAG warning light will turn on with no DTC's set.


1. If SIR diagnostic system check has been performed, go to next step. If SIR diagnostic system check has not been performed, go to SIR DIAGNOSTIC SYSTEM CHECK .

2. If IPC is functioning correctly, go to next step. If IPC is not functioning correctly, diagnose and repair IPC.

3. Turn ignition off. Observe AIR BAG warning light while turning ignition on. If AIR BAG warning light flashes 7 times, go to next step. If AIR BAG warning light does not flash 7 times, go to step 10 .

4. Turn ignition off. Install scan tool to Data Link Connector (DLC), located below driver-side instrument panel. Turn ignition on. If scan tool indicates ignition voltage is more than 9 volts, go to next step. If ignition voltage is 9 volts or less, go to step 6 .

5. If ignition voltage is more than 16 volts, inspect vehicle charging system. If ignition voltage is 16 volts or less, go to step 9 .

6. Turn ignition off. Check Yellow wire between SDM connector terminal 1 and fuse block connector terminal A7 for an open or high resistance. In an open or high resistance is found and corrected, go to step 13 . See WIRE REPAIR . If an open or high resistance is not found, go to next step.

7. Check voltage feed circuit from battery to AIR BAG fuse for an open or high resistance. If an open or high resistance is found, go to step 13 . If an open or high resistance is not found, go to next step.

8. Check Black wire between SDM connector terminal 32 and ground for an open or high resistance. If an open or high resistance is found and corrected, go to step 13 . If an open or high resistance is not found, go to next step.

9. Disconnect SDM connector. Inspect SDM connector for corrosion or damage. If corrosion or damage is found, replace SDM connector. See WIRE REPAIR . Go to step 13 . If corrosion or damage is not found, go to step 11 .

10. DIsconnect IPC connector. See INSTRUMENT PANEL CLUSTER (IPC) under REMOVAL & INSTALLATION. If IPC connector is damaged or corroded, replace connector. Go to step 13 . If IPC connector is okay, go to step 12 .

NOTE: For circuit number and wire color identification, see WIRING DIAGRAMS .

NOTE: Use Digital Multimeter (J-39200) and Connector Test Adapter Kit (J-35616-A) or Flat WIre Probe Adapter Kit (J-42675) when performing electrical tests.



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11. Replace SDM. See SENSING & DIAGNOSTIC MODULE (SDM) under REMOVAL & INSTALLATION. Go to step 13 .

12. Replace IPC. See INSTRUMENT PANEL CLUSTER (IPC) under REMOVAL & INSTALLATION. Go to next step.

13. Reconnect all SIR components. Ensure all components are installed and connected properly. Go to SYSTEM OPERATION CHECK .

PASSENGER PRESENCE SYSTEM (PPS) INDICATOR CIRCUIT MALFUNCTION

Circuit Description

PASSENGER AIR BAG ON and OFF indicators, located on rear view mirror, are used to notify driver when PPS has enabled or disabled the passenger-side air bag module. PPS indicators also inform driver of any PPS malfunctions. When ignition is turned on, PPS module is supplied with ignition voltage and commands both PASSENGER AIR BAG ON and OFF indicators on for 5 seconds. PPS module conducts tests on PPS components and circuits while both lights are on. If no malfunctions are detected, PPS will turn PASSENGER AIR BAG indicator on or off depending on status of PPS. If a malfunction is detected, PPS will store a Diagnostic Trouble Code (DTC), default PPS to off position and communicate to SDM that a DTC has been set.

Diagnostic Aids

A short, open or high resistance in circuits 2307 or 2308 could cause condition.


1. If SIR diagnostic system check has been performed, go to next step. If SIR diagnostic system check has not been performed, go to SIR DIAGNOSTIC SYSTEM CHECK .

2. Turn ignition off. Disconnect PPS ECU connector. See Fig. 12 . If PPS ECU connector shows signs of corrosion or damage, replace connector. See WIRE REPAIR . Go to step 10 . If connector is okay, go to next step.

3. Disconnect inside rear view mirror connector, located at rear of mirror assembly. If mirror connector shows signs of damage or corrosion, replace connector. See WIRE REPAIR . Go to step 10 . If mirror connector is okay, go to next step.

4. Turn ignition off. Inspect Yellow wire between mirror connector terminal No. 13 and SIR fuse for a short to ground, an open or high resistance. If a short to ground, an open or high resistance is found in circuit 1139 and corrected, go to step 10 . If a short to ground, an open or high resistance is not found and corrected, go to next step.

5. Inspect Dark Green wire between mirror connector terminal No. 4 and PPS ECU connector terminal "M"





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for a short to ground, an open or high resistance. See Fig. 30 . If a short to ground, an open or high resistance is found in circuit 2308 and corrected, go to step 10 . If a short to ground, an open or high resistance is not found and corrected, go to next step.

6. Inspect Dark Blue wire between mirror connector terminal No. 3 and PPS module connector terminal "L" for a short to ground, an open or high resistance. If a short to ground, an open or high resistance is found in circuit 2307 and corrected, go to step 10 . If a short to ground, an open or high resistance is not found and corrected, go to next step.

7. Turn ignition off. Connect a test light between ignition voltage circuit 1139 and PPS OFF air bag indicator circuit 2308. Ensure passenger seat is empty. Turn ignition on. If test light illuminates, go to next step. If test light does not illuminate, go to step 9 .

8. Replace rear view mirror. See REAR VIEW MIRROR under REMOVAL & INSTALLATION. Go to step 10 .

9. Replace PPS. See PASSENGER PRESENCE SYSTEM (PPS) under REMOVAL & INSTALLATION. Go to next step.

10. Reconnect all PPS and rear view mirror components. Ensure all components and connectors are connected properly. Using scan tool, clear all SIR and PPS DTC's. Rezero PPS. See PASSENGER PRESENCE SYSTEM REZEROING PROCEDURE . If condition is not corrected, go to step 2 . If condition is corrected, system is okay.

DTC 023 : PASSENGER SEAT BELT TENSION RETRACTOR SENSOR SIGNAL VOLTAGE LOW OR HIGH

Circuit Description

Seat belt tension retractor sensor is used to enhance Passenger Presence System (PPS) when an infant car seat is properly restrained on front outboard passenger seat. Seat tension retractor sensor is a 3-wire potentiometer mounted on lower seat belt anchor, providing input to PPS module. When infant car seat is properly restrained, seat belt is tightly secured through car seat. Seat belt pulls on tension sensor and changes voltage signal to PPS sensor. PPS uses voltage signal to help determine if a tightly belted infant car seat is installed. PPS uses inputs from seat belt tension retractor sensor and PPS pressure sensor to determine if passenger-side air bag module should be suppressed or enabled. PPS monitors seat belt tension retractor sensor circuits and sets DTC 023 if a fault is detected.

Conditions For Setting DTC

DTC sets when PPS detects voltage at passenger seat belt tension retractor sensor signal is less than 0.05 volts or greater than 4.5 volts for 500 milliseconds, when PPS detects voltage at passenger seat belt tension retractor sensor 5-volt reference is less than 4.5 volts or greater than 9.1 volts for 500 milliseconds or when PPS detects amperage at passenger seat belt tension retractor sensor low reference is 25 ma or greater for 500 milliseconds.

Action Taken

SDM disables passenger-side air bag module deployment loop and turns on AIR BAG warning light.

Conditions For Clearing DTC



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Current DTC clears when condition responsible for setting DTC no longer exists and scan tool CLEAR DTC command has been used to clear DTC's. History DTC clears when 255 malfunction-free ignition cycles have occurred.

Diagnostic Aids

Condition can be caused by a short between any combination of circuits 904, 905 and 906. An open or high resistance in any circuit could also cause condition.


1. If SIR Diagnostic System Check has been performed, go to next step. If SIR Diagnostic System Check has not been performed, go to SIR DIAGNOSTIC SYSTEM CHECK .

2. Turn ignition off. Disconnect seat belt tension retractor sensor connector. If seat belt tension retractor sensor connector shows signs of corrosion or damage, go to next step. If connector is okay, go to step 4 .

3. If seat belt tension retractor sensor terminals are damaged, replace seat belt retractor. See SEAT BELT RETRACTOR under REMOVAL & INSTALLATION. If harness connector is damaged, replace connector. See WIRE REPAIR . Go to step 15 .

4. Disconnect PPS module connector. If PPS module connector shows signs of corrosion or damage, replace connector. See WIRE REPAIR . Go to step 15 . If connector is okay, go to next step.

5. Inspect Yellow wire between seat belt tension retractor sensor terminal "C" and PPS module terminal No. 4 for a short to ground, an open or high resistance. See Fig. 30 . If a short to ground, an open or high resistance is found and corrected in circuit 904, go to step 15 . If short to ground, open or high resistance is not found, go to next step.

6. Inspect Light Blue wire between seat belt tension retractor sensor terminal "A" and PPS module terminal No. 16 for a short to ground, an open or high resistance. If short to ground, an open or high resistance is found and corrected in circuit 906, go to step 15 . If a short to ground, open or high resistance is not found, go to next step.

7. Inspect Tan wire between seat belt tension retractor sensor terminal "B" and PPS module terminal No. 14 for a short to ground, an open or high resistance. If a short to ground, open or high resistance is found and corrected in circuit 905, go to step 15 . If short to ground, open or high resistance is not found, go to next step.

8. Turn ignition on. Test circuit 904 for a short to voltage. If a short to voltage is found and corrected, go to step 15 . If a short to voltage is not found and corrected, go to next step.

9. Test seat belt tension retractor sensor signal circuit input voltage. If voltage is 0.05-4.5 volts, go to next step. If voltage is not 0.05-4.5 volts, go to step 12 .

10. Test circuit 906 for a short to voltage. If a short to voltage is found and corrected, go to step 15 . If a short





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to voltage is not found and corrected, go to next step. 11. Test circuit 905 for a short to voltage. If a short to voltage is found and corrected, go to step 15 . If a short

to voltage is not found and corrected, go to next step. 12. Replace seat belt tension retractor sensor. See SEAT BELT RETRACTOR under REMOVAL &

INSTALLATION. Go to next step. 13. Reconnect all SIR and PPS components. Ensure all components are properly mounted. Using scan tool,

clear SIR and PPS DTC's. Road test vehicle, then check for DTC's. If DTC is retrieved, go to next step. If DTC is not retrieved, system is okay.


15. Reconnect all SIR components. Ensure all components are properly mounted. Using scan tool, clear all SIR and PPS DTC's. Rezero PPS. See PASSENGER PRESENCE SYSTEM REZEROING PROCEDURE under DIAGNOSTICS. Road test vehicle, then check for DTC's. If DTC's retrieved, go to step 2 . If DTC is not retrieved, system is okay.

DTC 024 : PPS DETECTS LOW VOLTAGE

Circuit Description

Passenger Presence System (PPS) is used to monitor weight of an occupant on front outboard passenger seat and communicate status to SDM as to whether to enable or suppress passenger-side air bag module deployment loop. PPS consists of an Electronic Control Unit (ECU), silicone filled sensor pad, also known as PPS bladder, pressure sensor, seat belt tension retractor sensor, wiring harness and PASSENGER AIR BAG ON and OFF indicators. Weight of front passenger seat occupant is measured as a pressure change within bladder. If pressure is less than a specified value, PPS will send a signal to suppress passenger-side air bag module deployment loop. If pressure is more than a specified value, PPS will send a signal to enable passenger-side air bag module deployment loop. PPS will notify driver of status via PASSENGER AIR BAG ON and OFF indicators, located on inside rear view mirror. PPS monitors itself for faults and will set DTC is fault is detected. PPS will also notify SDM of fault. SDM will respond by setting either DTC B0092 or DTC B0098.


DTC sets when PPS detects ignition voltage is less than 8 volts for 500 milliseconds.

Action Taken




Diagnostic Aids



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Condition could be caused by a short, an open or high resistance in ignition voltage circuit between PPS module and body relay block.



2. Turn ignition off. Disconnect PPS module connector. If PPS module connector shows signs of damage or corrosion, replace connector. See WIRE REPAIR . Go to step 7 . If PPS module connector is okay, go to next step.

3. Disconnect main seat harness connector, located under seat. Inspect both halves of connector for damage or signs of corrosion. If damage or corrosion is found, replace connector. See WIRE REPAIR . Go to step 7 . If damage or corrosion is not found, go to next step.

4. Test Black wire between PPS connector terminal No. 5 and ground for an open or high resistance. See Fig. 30 . If an open or high resistance is found in circuit 2351 and corrected, go to step 7 . If an open or high resistance is not found and corrected, go to next step.

5. Test Yellow wire between PPS connector terminal No. 9 and SIR fuse for a short to ground, an open or high resistance. If a short to ground, an open or high resistance is found in circuit 1139 and corrected, go to step 7 . If an open or high resistance is not found and corrected, go to next step.


7. Reconnect all SIR and PPS components. Verify all components and connectors are properly mounted and connected. Using scan tool, clear all DTC's. Rezero PPS. See PASSENGER PRESENCE SYSTEM REZEROING PROCEDURE under DIAGNOSTICS. Road test vehicle, then check for DTC's. If DTC's are retrieved, go to step 2 . If DTC's are not retrieved, system is okay.

DTC 033 : DISABLE SWITCH VOLTAGE HIGH OR LOW

Circuit Description

Passenger-side air bag module disable switch circuit consists of disable switch, disable switch indicator, disable switch circuit and suppression indicator control circuit. When ignition is turned on, Passenger Presence System (PPS) module performs tests to diagnose critical internal malfunctions. PPS will set DTC's if faults are detected. PPS will also notify SDM of fault. SDM will respond by setting DTC B0092 or DTC B0098 and requesting Instrument Panel Cluster (IPC) to turn on AIR BAG warning light.

PPS module monitors voltage levels of passenger-side air bag module disable switch signal and suppression indicator control circuits to determine the position of passenger-side air bag module disable switch. If a





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malfunction is detected, PPS will set DTC 033.


DTC will set when voltage at passenger-side air bag module disable switch signal and suppression indicator control circuits is low or high with disable switch indicator OFF for 500 milliseconds. DTC can also be set when voltage in passenger-side disable switch signal circuit is low with disable switch indicator ON and voltage in indicator control circuit high for 500 milliseconds.

Action Taken

SDM disables passenger-side air bag module deployment loop. PPS will turn passenger-side air bag module disable switch indicator light on and off every 5 seconds and will command PASSENGER AIR BAG indicator to turn OFF.



Diagnostic Aids

Condition could be caused by a short between passenger-side air bag module disable switch signal and suppression circuits.



2. Turn ignition off. Turn passenger-side air bag module disable switch to ON position. Turn ignition on. If passenger-side air bag module ON indicator is illuminated in disable switch, go to step 8 . If ON indicator is not illuminated, go to next step.

3. Turn ignition off. Disconnect passenger-side air bag module disable switch connector. See PASSENGER-SIDE AIR BAG DISABLE SWITCH under REMOVAL & INSTALLATION. If harness side of connector is damaged, replace connector. See WIRE REPAIR . Go to step 13 . If disable switch side of connector is damaged, replace switch. Go to step 13 . If both sides of connector are okay, go to next step.

4. Disconnect main seat harness connector, located under passenger front seat. If either side of connector shows signs of corrosion or damage, replace connector. See WIRE REPAIR . Go to step 13 . If connector is okay, go to next step.

5. Disconnect PPS module connector. If PPS module connector shows signs of corrosion or damage, replace connector. See WIRE REPAIR . Go to step 13 . If PPS connector is okay, go to next step.




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6. Inspect Yellow wire between passenger-side air bag module disable switch terminal "A" and underhood fuse block for an open or high resistance. If an open or high resistance is found and corrected, go to step 13 . If an open or high resistance is not found and corrected, go to next step.

7. Inspect Black wire between passenger-side air bag module disable switch terminal "F" and ground for an open or high resistance. If an open or high resistance is found and corrected, go to step 13 . If an open or high resistance is not found and corrected, go to next step.

8. Turn ignition off. Inspect passenger-side air bag module disable switch circuit (Tan/Black wire) for an open, short or high resistance. If an open, short or high resistance is found and corrected, go to step 13 . If an open, short or high resistance is not found, go to next step.

9. Inspect passenger-side air bag module suppression indicator control circuit (Pink wire) for an open, short or high resistance. If an open, short or high resistance is found and corrected, go to step 13 . If an open, short or high resistance is not found, go to next step.

10. Replace passenger-side air bag module disable switch. See PASSENGER-SIDE AIR BAG DISABLE SWITCH under REMOVAL & INSTALLATION. Go to next step.

11. Reconnect all SIR and PPS components. Verify all components and connectors are properly mounted and connected. Using scan tool, clear all DTC's. Road test vehicle, then check for DTC's. If DTC is retrieved, go to next step. If DTC is not retrieved, system is okay.


13. Reconnect all SIR and PPS components. Verify all components and connectors are properly mounted and connected. Using scan tool, clear all DTC's. Rezero PPS. See PASSENGER PRESENCE SYSTEM REZEROING PROCEDURE under DIAGNOSTICS. Road test vehicle, then check for DTC's. If DTC's are retrieved, go to step 2 . If DTC's are not retrieved, system is okay.

DTC 063 : PPS OUT OF CALIBRATION

Circuit Description

Passenger Presence System (PPS) is used to monitor weight of an occupant on front outboard passenger seat and communicate status to SDM whether to enable or suppress passenger-side air bag module deployment. PPS consists of an Electronic Control Unit (ECU), silicone filled sensor pad (PPS bladder), pressure sensor, seat belt tension retractor sensor, wiring harness and PASSENGER AIR BAG ON and OFF indicators. Weight of seat occupant is measured as a pressure change within bladder by pressure sensor.

If pressure from occupants weight is less than a specified value, PPS module will send a suppress signal to SDM to disable passenger-side air bag module deployment loop. If pressure from occupants weight is more than a specified value, PPS module will send an enable signal to SDM to enable passenger-side air bag module deployment loop. PPS will notify driver of enable/suppress status by turning on PASSENGER AIR BAG ON or OFF indicator, located on rear view mirror. PPS monitors itself for faults and will set a DTC if fault is detected. PPS will also notify SDM of fault. SDM will respond by setting DTC B0092 and requesting Instrument Panel Cluster (IPC) to turn on AIR BAG warning light. PPS will set DTC 063 as an indication that PPS is out of




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calibration.

Action Taken



DTC is an indication PPS is out of calibration. PPS cannot be recalibrated. Replace PPS after following diagnostic procedure.

Diagnostic Aids

Presence of current or history DTC's while attempting to rezero PPS will cause PPS module to set DTC B063. Verify all SIR and PPS DTC's have been cleared before rezeroing PPS.



2. Install a scan tool to Data Link Connector (DLC), located under left side of instrument panel. Turn ignition on. Using scan tool, clear all SIR and PPS DTC's. Rezero PPS. See PASSENGER PRESENCE SYSTEM REZEROING PROCEDURE . Road test vehicle. If DTC resets, go to next step. If DTC does not reset, go to SIR DIAGNOSTIC SYSTEM CHECK .


4. Reconnect all SIR and PPS components. Verify all components and connectors are properly mounted and connected. Using scan tool, clear all DTC's. Rezero PPS. See PASSENGER PRESENCE SYSTEM REZEROING PROCEDURE under DIAGNOSTICS. Road test vehicle. Go to SIR DIAGNOSTIC SYSTEM CHECK .

DTC 064 : PPS HAS LOST COMMUNICATION WITH SDM

Circuit Description

Passenger Presence System (PPS) is used to monitor weight of an occupant on front outboard passenger seat and communicate status to SDM whether to enable or suppress passenger-side air bag module deployment. PPS consists of an Electronic Control Unit (ECU), silicone filled sensor pad (pressure bladder), pressure sensor, seat belt tension retractor sensor, wiring harness and PASSENGER AIR BAG ON and OFF indicators, located on rear view mirror. Weight of seat occupant is measured as a pressure change within bladder by pressure sensor. Pressure sensor sends a signal to PPS module.

If pressure from occupant weight is less than a specified value, PPS module will send a suppress signal to SDM to disable passenger-side air bag module deployment loop. If pressure from occupant weight is more than a




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specified value, PPS module will send an enable signal to SDM to enable passenger-side air bag module deployment loop. PPS will notify driver of enable/suppress status by turning on PASSENGER AIR BAG ON or OFF indicator, located on rear view mirror. PPS monitors itself for faults and will set a DTC if fault is detected. PPS will also notify SDM of fault. SDM will respond by setting either DTC B0092 or B0098 and requesting Instrument Panel Cluster (IPC) to turn on AIR BAG warning light.


DTC sets when PPS has lost communication with SDM or when PPS verification identification does not match verification identification in SDM.

Action Taken




Diagnostic Aids

DTC B0092 or B0098 will set if PPS has a current malfunction and has set DTC 064. SDM will set DTC B0092 or B0098 as current and command AIR BAG warning light to turn on, notifying driver of any PPS malfunctions. When DTC B0092 or B0098 are present, it is important to check PPS for any current DTC's. See PASSENGER PRESENCE FLASH CODE PROCEDURE .



2. Install a scan tool to Data Link Connector (DLC), located under left side of instrument panel. Turn ignition on. Using scan tool, request PPS to flash DTC's. See PASSENGER PRESENCE FLASH CODE PROCEDURE . If PPS indicates DTC 064 is current, go to next step. If DTC 064 is not current, go to step 13 .

3. If scan tool indicates that DTC B0098 is current, go to DTC B0098 . If DTC B0098 is not current, go to next step.

4. Turn ignition off. Disconnect PPS module connector. Inspect PPS terminals and connector for signs of damage or corrosion. If damage or corrosion are found, go to next step. If damage or corrosion are not found, go to step 6 .

5. If PPS module terminals are damaged, replace PPS. See PASSENGER PRESENCE SYSTEM (PPS) under REMOVAL & INSTALLATION. Go to step 13 . If PPS connector is damaged, replace connector. See WIRE REPAIR . Go to step 13 .




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6. Disconnect main seat harness connector, located under passenger front seat. Inspect both halves of connector for corrosion or damage. If connector is damaged, replace connector. See WIRE REPAIR . Go to step 13 . If connector is okay, go to next step.

7. Disconnect SDM connector. See Fig. 19 . If SDM connector terminals are damaged or corroded, replace connector. See WIRE REPAIR . Go to step 13 . If SDM connector is okay, go to next step.

8. Inspect PPS serial data circuit for a short to ground, an open or a high resistance. If a short to ground, an open or a high resistance is found and corrected, go to step 13 . If a short to ground, an open or a high resistance is not found and corrected, go to next step.

9. Turn ignition on. Inspect PPS serial data circuit for a short to voltage. If a short to voltage is found and corrected, go to step 13 . If a short to voltage is not found and corrected, go to next step.


11. Reconnect all SIR and PPS components. Verify all components and connectors are properly mounted and connected. Using scan tool, clear all SIR and PPS DTC's. Rezero PPS. See PASSENGER PRESENCE SYSTEM REZEROING PROCEDURE under DIAGNOSTICS. Road test vehicle, then check for DTC's. If DTC's are retrieved, go to next step. If DTC's are not retrieved, system is okay.

12. Replace SDM. See SENSING & DIAGNOSTIC MODULE (SDM) under REMOVAL & INSTALLATION. Go to next step.

13. Reconnect all SIR and PPS components. Verify all components and connectors are properly mounted and connected. Using scan tool, clear all SIR and PPS DTC's. Rezero PPS. See PASSENGER PRESENCE SYSTEM REZEROING PROCEDURE under DIAGNOSTICS. Road test vehicle, then check for DTC's. If DTC's are retrieved, go to step 2 . If DTC's are not retrieved, system is okay.

DTC 065 : PPS VOLTAGE OUT OF RANGE

Circuit Description

Passenger Presence System (PPS) is used to monitor weight of an occupant on front outboard passenger seat and communicate status to SDM whether to enable or suppress passenger-side air bag module deployment. PPS consists of an Electronic Control Unit (ECU), silicone filled sensor pad (pressure bladder), pressure sensor, seat belt tension retractor sensor, wiring harness and PASSENGER AIR BAG ON and OFF indicators, located on rear view mirror. Weight of seat occupant is measured as a pressure change within bladder by pressure sensor. Pressure sensor sends a signal to PPS module.

If pressure from occupant weight is less than a specified value, PPS module will send a suppress signal to SDM to disable passenger-side air bag module deployment loop. If pressure from occupant weight is more than a specified value, PPS module will send an enable signal to SDM to enable passenger-side air bag module deployment loop. PPS will notify driver of enable/suppress status by turning on PASSENGER AIR BAG ON or OFF indicator, located on rear view mirror. PPS monitors itself for faults and will set a DTC if fault is detected. PPS will also notify SDM of fault. SDM will respond by setting DTC B0092 and requesting Instrument Panel




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Cluster (IPC) to turn on AIR BAG warning light.


DTC sets when PPS detects voltage in PPS sensor signal circuit is less than 0.05 volts or more than 4.5 volts for 500 milliseconds. DTC will also set when PPS detects voltage at PPS sensor 5-volt reference circuit is less than 4.5 volts or more than 9.1 volts for 500 milliseconds or when PPS detects amperage at PPS sensor low reference circuit is 25 ma or more for 500 milliseconds.

Action Taken




Diagnostic Aids

Condition can be caused by a short between any combination of circuits 904, 905 and 906. An open or high resistance in any circuit could also cause condition.



2. Turn ignition off. Disconnect PPS pressure sensor connector. If pressure sensor terminals or wire harness connector show signs of corrosion, go to next step. If pressure sensor terminals and wire harness connector are okay, go to step 4 .

3. If PPS pressure sensor terminals are damaged, replace PPS. See PASSENGER PRESENCE SYSTEM (PPS) under REMOVAL & INSTALLATION. Go to step 13 . If harness connector is damaged, replace harness connector. See WIRE REPAIR . Go to step 13 .

4. Disconnect PPS module connector. If PPS module connector shows signs of corrosion or damage, replace module connector. See WIRE REPAIR . Go to step 13 . If PPS module connector is okay, go to next step.

5. Inspect PPS sensor signal circuit for a short to ground, an open or a high resistance. If a short to ground, an open or a high resistance condition is found and corrected, go to step 13 . If a short to ground, an open





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or a high resistance is not found, go to next step. 6. Inspect PPS sensor 5-volt reference circuit for a short to ground, an open or a high resistance. If a short to

ground, an open or a high resistance condition is found and corrected, go to step 13 . If a short to ground, an open or a high resistance is not found, go to next step.

7. Inspect PPS sensor 5-volt reference circuit for a short to ground, an open or a high resistance. If a short to ground, an open or a high resistance condition is found and corrected, go to step 13 . If a short to ground, an open or a high resistance is not found, go to next step.

8. Turn ignition on. Inspect PPS sensor signal circuit for a short to voltage. If a short to voltage is found and corrected, go to step 13 . If a short to voltage is not found, go to next step.

9. Measure PPS signal circuit input voltage. If voltage is 0.05 to 4.5 volts, go to next step. If voltage is not 0.05 to 4.5 volts, go to step 12 .

10. Inspect PPS 5-volt reference circuit for a short to voltage. If a short to voltage is found and corrected, go to step 13 . If a short to voltage is not found, go to next step

11. Inspect PPS low reference circuit for a short to voltage. If a short to voltage is found and corrected, go to step 13 . If a short to voltage is not found, go to next step.


13. Reconnect all SIR and PPS components. Verify all components and connectors are properly connected and installed. Using scan tool, clear all SIR and

Air Bag Restraint System

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