Electrical Component Locator

2003 GENERAL MOTORS

Sierra & Silverado

BUZZERS, RELAYS & TIMERS

BUZZERS, RELAYS & TIMERS LOCATION

CIRCUIT PROTECTION DEVICES

CIRCUIT PROTECTION DEVICES LOCATION

CONTROL UNITS

CONTROL UNITS LOCATION

Component LocationA/C COMP Relay In underhood fuse block.Auxiliary Battery Relay At right rear of engine compartment. See Fig. 9 .DEFOG RELAY In I/P relay block.DRL Relay In underhood fuse block.DRIVER UNLOCK Relay In left I/P fuse block.Engine Glow Plug Relay (6.6L VIN 1) At left rear of engine. See Fig. 11 .FOG LP Fuse In underhood fuse block.F/PMP Relay In underhood fuse block.Fuel Pump Relay (Secondary) On underhood fuse block bracket.HDLP-HI Relay In underhood fuse block.HDLP-LOW Relay In underhood fuse block.HORN Relay In underhood fuse block.IGN 1 Relay In underhood fuse block.LOCK Relay In left I/P fuse block.PARK LP Relay In underhood fuse block.Power Take-Off Relay On underhood fuse block bracket.Roof Beacon Relay At lower left "B" pillar.STARTER Relay In underhood fuse block.UNLOCK Relay In left I/P fuse block.W/S WASH Relay In underhood fuse block.

Component LocationI/P Relay Block Below left side of dash, left of steering column.Left I/P Fuse Block On lower left side of dash.Right I/P Fuse Block On lower right side of dash.Underhood Fuse Block At left side of engine compartment, near battery.

2003 Chevrolet Silverado 1500

2003 GENERAL MOTORS Sierra & Silverado



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April-29-08 10:47:15 AM © 2005 Mitchell Repair Information Company, LLC.

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April-29-08 10:47:18 AM Page 1 © 2005 Mitchell Repair Information Company, LLC.

MOTORS

MOTORS LOCATION

Component LocationBlower Motor Control Processor Behind right side of dash, on HVAC assembly.Body Control Module On lower left side of dash, below steering column.Cruise Control Module In left rear of engine compartment, on firewall.Driver Door Module Behind driver's door trim panel, below switch assembly.Electronic Brake Control Module On left side of inner frame.Engine Control Module (6.6L VIN 1) At left front of engine compartment.Front Passenger Door Module Behind front passenger's door trim panel, below switch

assembly.Fuel Injector Control Module (6.6L VIN 1) Under engine air intake duct.HVAC Control Module Behind center of dash.Ignition Control Module (4.3L VIN W) At right rear of engine, near ground strap.Inflatable Restraint I/P Module Behind right side of dash.Inflatable Restraint Sensing/Diagnostic Module

Under left front seat.

Memory Seat Module Underside of left front seat.Powertrain Control Module (PCM) On left front of engine compartment. See Fig. 10 .Rear Wheel Steering Control Module At left rear of vehicle, near spare tire bracket.Throttle Actuator Control Module (Except 4.3L)

At left rear of engine compartment.

Transfer Case Shift Control Module Behind headlamp switch.Transmission Control Module At left front of engine compartment.Vehicle Communication Interface Module Behind passenger air bag module.Windshield Wiper Motor Module Under windshield cowl, between wiper arms.

Component LocationAir Temperature Actuator (Left) At bottom center of HVAC control

assembly.Air Temperature Actuator (Right) At top center of HVAC control assembly.Front Axle Actuator On right side of center, on axle housing.Fuel Pump (6.6L VIN 1) In left side frame rail.Fuel Pump & Sender Assembly (Primary) (Gas engines) In primary fuel tank.Fuel Pump & Sender Assembly (Secondary) (Gas engines)

In secondary fuel tank.

Fuel Transfer Pump (6.6L VIN 1) In rear fuel tank.Mode Actuator On left side of HVAC module.Recirculation Actuator On top center of HVAC module.Supplemental Brake Assist Pump Motor Mounted to power brake booster.



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SENDING UNITS & SENSORS

SENDING UNITS & SENSORS LOCATION

Windshield Washer Fluid Pump In washer fluid reservoir.

Component LocationA/C Refrigerant Pressure Sensor In air conditioning muffler hose assembly.Accelerator Pedal Position Sensor (Except 4.3L) Driver's floor board, behind accelerator pedal.Air Temperature Sensor Assembly (Inside) In headliner, above driver.Air Temperature Sensor (Lower Left) In lower left floor duct assembly.Air Temperature Sensor (Lower Right) At bottom center of HVAC box, in floor duct.Air Temperature Sensor (Outside) At center of core support, behind grille.Air Temperature Sensor (Upper) Below dash trim panel, in upper duct.Ambient Air Temperature Sensor In right front bumper filler assembly.Ambient Light Sensor On top center of dash.Automatic Transmission Fluid Temperature Sensor In automatic transmission.Automatic Transmission Input Shaft Speed Sensor In automatic transmission.Automatic Transmission Turbine Speed Sensor In upper left of transmission.Barometric Pressure Sensor (6.6L VIN 1) On left side of engine.Boost Sensor (6.6L VIN 1) On right side of engine, on intake manifold.Camshaft Position Sensor (4.3L VIN W) In distributor.Camshaft Position Sensor (4.8L VIN V) On top center rear of engine.Camshaft Position Sensor (5.3L VIN T) On top center rear of engine.Camshaft Position Sensor (6.0L VIN U) On top center rear of engine.Camshaft Position Sensor (6.6L VIN 1) On front of engine, near cooling fan pulley.Camshaft Position Sensor (8.1L VIN G) On left side of timing cover.Crankshaft Position (CKP) Sensor (4.3L VIN W) On bottom front of engine, near crank pulley. See

Fig. 2 .Crankshaft Position (CKP) Sensor (4.8L VIN V) On lower right rear of engine block. See Fig. 7 .Crankshaft Position (CKP) Sensor (5.3L VIN T) On lower right rear of engine block. See Fig. 7 .Crankshaft Position (CKP) Sensor (6.0L VIN U) On lower right rear of engine block. See Fig. 7 .Crankshaft Position (CKP) Sensor (6.6L VIN 1) On right side of engine front cover.Crankshaft Position (CKP) Sensor (8.1L VIN G) On top left rear of engine block, near bellhousing.

See Fig. 8 .Engine Coolant Temperature (ECT) Sensor (4.3L VIN W)

On rear side of left cylinder head. See Fig. 3 .

Engine Coolant Temperature (ECT) Sensor (4.8L VIN V)

On front side of left cylinder head. See Fig. 5 .

Engine Coolant Temperature (ECT) Sensor (5.3L VIN T)


Engine Coolant Temperature (ECT) Sensor (6.0L VIN U)




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Engine Coolant Temperature (ECT) Sensor (6.6L VIN 1)

On top front of engine. See Fig. 11 .

Engine Coolant Temperature Sensor (8.1L VIN G) At middle of right cylinder head.Engine Oil Pressure (EOP) Sensor (4.8L VIN V) On top rear of engine.Engine Oil Pressure (EOP) Sensor (5.3L VIN T) On top rear of engine.Engine Oil Pressure (EOP) Sensor (6.0L VIN U) On top rear of engine.Engine Oil Pressure (EOP) Sensor (8.1L VIN G) On top rear of engine. See Fig. 8 .Fuel Composition Sensor At left side of engine compartment, attached to fuel

lines.Fuel Level Sensor (Primary) In primary fuel tank.Fuel Level Sensor (Secondary) In secondary fuel tank.Fuel Pump & Sender Assembly (Primary) In primary fuel tank.Fuel Pump & Sender Assembly (Secondary) In secondary fuel tank.Fuel Rail Pressure Sensor (6.6L VIN 1) Under intake manifold shield, on fuel rail.Fuel Tank Pressure Sensor On fuel tank, integral to fuel pump & sender

assembly.Heated Oxygen Sensor Bank No. 1 Sensor No. 1 In left exhaust pipe, before catalytic converter.Heated Oxygen Sensor Bank No. 1 Sensor No. 2 In left exhaust pipe, after catalytic converter.Heated Oxygen Sensor Bank No. 2 Sensor No. 1 In right exhaust pipe, before catalytic converter.Heated Oxygen Sensor Bank No. 2 Sensor No. 2 In right exhaust pipe, after catalytic converter.Inflatable Restraint Front End Discriminating Sensor (Left)

On left front of vehicle, by core support.

Inflatable Restraint Front End Discriminating Sensor (Right)

On right front of vehicle, by core support.

Intake Air Temperature (IAT)/Mass Airflow (MAF) Sensor

In air induction tube. See Fig. 9 .

Knock Sensor (KS) (4.3L VIN W) On rear of engine block. See Fig. 1 .Knock Sensors (KS) (4.8L VIN V) In valley, under intake manifold. See Fig. 6 .Knock Sensors (KS) (5.3L VIN T) In valley, under intake manifold. See Fig. 6 .Knock Sensors (KS) (6.0L VIN U) In valley, under intake manifold. See Fig. 6 .Knock Sensor Bank No. 1 (8.1L VIN G) On left side of engine, forward of oil filter.Knock Sensor Bank No. 2 (8.1L VIN G) On right side of engine, forward of starter.Manifold Absolute Pressure (MAP) Sensor (4.3L VIN W)

On top rear of engine, on intake manifold. See Fig. 4 .

Manifold Absolute Pressure (MAP) Sensor (4.8L VIN V)


Manifold Absolute Pressure (MAP) Sensor (5.3L VIN T)


Manifold Absolute Pressure (MAP) Sensor (6.0L VIN U)


Manifold Absolute Pressure (MAP) Sensor (8.1L VIN G)

On top rear of engine, on intake manifold.



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SOLENOIDS & SOLENOID VALVES

SOLENOIDS & SOLENOID VALVES LOCATION

SWITCHES

SWITCHES LOCATION

Propshaft Speed Sensor (Front) On left front side of transfer case.Propshaft Speed Sensor (Rear) On transfer case extension housing.Throttle Position (TP) Sensor (4.3L VIN W) On throttle body assembly. See Fig. 1 .Vehicle Speed Sensor (2WD) On left rear side of transmission.Vehicle Speed Sensor (4WD) On left side of transfer case.Washer Fluid Level Sensor In washer fluid reservoir.Water In Fuel Sensor (6.6L VIN 1) On fuel filter element.Wheel Speed Sensor (Left Front) On left front wheel hub assembly.Wheel Speed Sensor (Right Front) On right front wheel hub assembly.

Component LocationEvaporative Emissions (EVAP) Canister Purge Solenoid (4.3L VIN W)

At right side of engine, attached to intake manifold. See Fig. 1 .

Evaporative Emissions (EVAP) Canister Purge Solenoid (4.8L VIN V)

Behind throttle body, near front of engine. See Fig. 5 .

Evaporative Emissions (EVAP) Canister Purge Solenoid (5.3L VIN T)


Evaporative Emissions (EVAP) Canister Purge Solenoid (6.0L VIN U)


Evaporative Emissions (EVAP) Canister Purge Solenoid (8.1L VIN G)

Left side of throttle body, near left of engine.

Evaporative Emissions Canister Vent Solenoid On right front side of fuel tank.Exhaust Gas Recirculation (EGR) Valve (8.1L VIN G) On top rear center of engine. See Fig. 8 .Idle Air Control Valve (4.3L VIN W) Mounted to throttle body. See Fig. 1 .Pressure Control Solenoid Valve In automatic transmission.Shock Absorber Solenoid (Left Front) Part of left front shock.Shock Absorber Solenoid (Left Rear) Part of left rear shock.Shock Absorber Solenoid (Right Front) Part of right front shock.Shock Absorber Solenoid (Right Rear) Part of right rear shock.Torque Converter Clutch Pulse Width Modulation Solenoid Valve

In automatic transmission.

Torque Converter Clutch Solenoid Valve In automatic transmission.Trim Solenoid A In automatic transmission.Trim Solenoid B In automatic transmission.

Component Location



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MISCELLANEOUS

MISCELLANEOUS LOCATION

CONNECTORS

CONNECTORS LOCATION

A/C High Pressure Switch (6.6L VIN 1) On right side of compressor. See Fig. 11 .

A/C Low Pressure Switch On right side of accumulator. See Fig. 9 .

Automatic Transmission Fluid Pressure Manual Valve Position Switch

In automatic transmission.

Back-Up Lamp Switch On left side of transmission.Brake Fluid Level Switch On left side of brake fluid reservoir.Brake Pressure Differential Switch In brake line under master cylinder.Clutch Start Switch On top of clutch pedal assembly.Coolant Level Switch In coolant reservoir.Engine Oil Level Switch (Except 6.6L) On right side of oil pan.Engine Oil Level Switch (6.6L VIN 1) On left rear of oil pan.Engine Oil Pressure (EOP) Switch (4.3L VIN W) On top rear of engine. See Fig. 1 .Park Brake Switch Part of park brake assembly.Park/Neutral Position Switch On left side of transmission.Pressure Switch Manifold In automatic transmission.Stoplamp Switch On top of brake pedal bracket.Surge Tank Switch (6.6L VIN 1) On surge tank.

Component LocationAudio Amplifier Under rear of center console.Back-Up Alarm At rear bumper.Cellular & Navigation Antenna Mounted to roof, near left "A" pillar.Data Link Connector Under left side of dash, below steering column.Fuel Heater (6.6L VIN 1) On top of fuel filter element.Ignition Coil (4.3L VIN W) On top right side of engine. See Fig. 1 .Ignition Coil (4.8L VIN V) On top of left & right valve covers.Ignition Coils (5.3L VIN T) On top of left & right valve covers.Ignition Coils (6.0L VIN U) On top of left & right valve covers.Ignition Coils (8.1L VIN G) On top of left & right valve covers.Intake Air Heater (6.6L VIN 1) Under intake manifold sight shield, inside air intake pipe.

Component LocationC100 (Black, 16 Pin) Under underhood fuse block.



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C102 (Black, 8 Pin) Under underhood fuse block.C104 (Black, 12 Pin) Front side of fuse block.C105 (Black, 10 Pin) Near underhood fuse block.C107 (6.6L VIN 1) (Black, 38 Pin) On top of left valve cover. See Fig. 11 .C108 (6.6L VIN 1) (Black, 24 Pin) On top of left valve cover. See Fig. 11 .C109 (Black, 4 Pin) On top of valve cover.C110 (Black, 4 Pin) On top of valve cover.C111 (Black, 4 Pin) On top of valve cover.C112 (Black, 4 Pin) At left rear of engine compartment.C115 (Black, 24 Pin) At left rear of engine compartment.C116 (Black, 1 Pin) Attached to underhood fuse block.C125 (Light Gray, 8 Pin) On radiator support.C127 (Light Gray, 7 Pin) On radiator support.C148 (Light Gray, 7 Pin) On top left side of engine.C149 (Light Gray, 7 Pin) On top right side of engine.C150 (Black, 4 Pin) On left inner fender.C151 (Black, 12 Pin) On left inner fender.C152 (Blue, 12 Pin) Under underhood fuse block.C153 (Black, 3 Pin) On left inner fender.C154 (Black, 3 Pin) On left inner fender.C155 (Black, 10 Pin) Near left top front of engine.C198 (Black, 1 Pin) On left inner fender.C201 (Black, 32 Pin) On steering column.C202 (Black, 12 Pin) Behind left side of dash.C206 (Light Gray, 22 Pin) Behind left kick panel.C210 (Black, 2 Pin) Behind left side of dash.C214 Behind upper left side of dash.C220 (Gray, 24 Pin) Behind center of dash.C221 (Yellow, 4 Pin) Behind left kick panel.C222 (Yellow, 4 Pin) Behind right kick panel.C223 (Black, 16 Pin) Behind left kick panel.C230 (Black, 2 Pin) Behind upper right side of dash.C249 (Black, 4 Pin) Behind center of dash.C250 (Gray, 6 Pin) Behind left side of dash.C305 (Black, 16 Pin) Under left front seat.C306 (Black, 40 Pin) Under front floor console.C310 (Natural, 17 Pin) At left "B" pillar.C320 (Light Gray, 13 Pin) Under left front seat.C321 (24 Pin) Under left front seat.C322 (Natural, 10 Pin) Under left front seat.C323 (Black, 6 Pin) Under left front seat.



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GROUNDS

GROUNDS LOCATION

C324 (Black, 8 Pin) Under left front seat.C325 (Gray, 6 Pin) Under left front seat.C326 (Gray, 6 Pin) Under right front seat.C329 (Gray, 4 Pin) Under right front seat.C350 (Black, 2 Pin) At top of transfer case.C388 (Black, 6 Pin) Under right front seat.C396 (Black, 17 Pin) At right "B" pillar.C399 (Black, 16 Pin) Under right front seat.C404 (Black, 2 Pin) Under rear bumper.C405 (Black, 2 Pin) Under rear bumper.

Component LocationG100 On lower left of radiator core support.G102 (4.3L VIN W) On lower right front of engine block.G102 (4.8L VIN V) On left side of engine block. See Fig. 5 .G102 (5.3L VIN T) On left side of engine block. See Fig. 5 .G102 (6.0L VIN U) On left side of engine block. See Fig. 5 .G102 (8.1L VIN G) On left side of engine block.G103 (4.3L VIN W) On right rear of engine block. See Fig. 1 .G103 (4.8L VIN V) On right rear of engine block.G103 (5.3L VIN T) On right rear of engine block.G103 (6.0L VIN U) On right rear of engine block.G103 (8.1L VIN G) On right rear of engine block.G104 (4.3L VIN W) On left rear of engine block. See Fig. 1 .G104 (4.8L VIN V) On left rear of engine block.G104 (5.3L VIN T) On left rear of engine block.G104 (6.0L VIN U) On left rear of engine block.G104 (8.1L VIN G) On left rear of engine block.G105 On lower right front of engine block.G106 On right front of engine block.G110 On left front body mount.G200 Behind right side of dash, near right "A" pillar.G203 Behind left side of dash, near left "A" pillar.G302 On left rear body mount.G304 Under left front seat.G305 On left "B" pillar.G306 On right "B" pillar.G390 Near "C" pillar.



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SPLICES

SPLICES LOCATION

G401 On spare tire hoist bracket.G403 On left rear frame body mount bracket.G410 On right rear inner side body panel.

Component LocationSP205 In I/P harness.SP207 In I/P harness.SP250 In infotainment jumper harness.S100 In forward lamp harness.S101 In engine harness.S102 In engine harness.S103 In engine harness.S104 In engine harness.S107 In forward lamp harness.S110 In engine harness.S111 In chassis harness.S119 In engine harness.S150 In chassis harness.S151 In ignition coil jumper harness.S152 In injector jumper harness.S153 In ignition coil jumper harness.S154 In injector jumper harness.S156 In engine harness.S157 In engine harness.S159 In engine harness.S160 In ignition coil jumper harness.S161 In I/P harness.S162 In I/P harness.S163 In engine harness.S165 In engine harness.S197 In battery positive cable.S200 At roof marker lights.S201 At roof marker lights.S202 In I/P harness.S205 In I/P harness.S206 In I/P harness.S207 In headliner harness.S212 In I/P harness.



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COMPONENT LOCATION GRAPHICS

S213 In I/P harness.S214 In I/P harness.S215 In brake clutch harness.S216 In steering column harness.S217 In steering column harness.S218 In I/P harness.S219 In brake clutch harness.S240 In steering column harness.S241 In steering column harness.S301 In console harness.S307 In console harness.S309 In driver seat harness.S310 In driver seat harness.S311 In driver seat harness.S314 In driver seat harness.S315 In driver seat harness.S316 In driver seat harness.S322 In driver seat harness.S328 In passenger seat harness.S329 In passenger seat harness.S333 In console harness.S350 In chassis harness.S408 In left rear lamp harness.S412 In left rear lamp harness.S413 In right rear lamp harness.S480 In right rear lamp harness.S710 In left rear door harness.S810 In right rear door harness.

NOTE: Figures may show multiple component locations. Refer to appropriate table for proper figure references.



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Fig. 1: Rear Of Engine (4.3L VIN W) Courtesy of GENERAL MOTORS CORP.



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Fig. 2: Lower Front Of Engine (4.3L VIN W) Courtesy of GENERAL MOTORS CORP.



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Fig. 3: Left Side Of Engine (4.3L VIN W) Courtesy of GENERAL MOTORS CORP.



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Fig. 4: Top Of Engine (4.3L VIN W) Courtesy of GENERAL MOTORS CORP.



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Fig. 5: Left Side Of Engine (4.8L VIN V, 5.3L VIN T & 6.0L VIN U)Courtesy of GENERAL MOTORS CORP.

Fig. 6: Center Of Engine (4.8L VIN V, 5.3L VIN T & 6.0L VIN U) Courtesy of GENERAL MOTORS CORP.



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Fig. 7: Lower Right Rear Of Engine (4.8L VIN V, 5.3L VIN T & 6.0L VIN U) Courtesy of GENERAL MOTORS CORP.



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Fig. 8: Rear Of Engine (8.1L VIN G) Courtesy of GENERAL MOTORS CORP.



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Fig. 9: Right Rear Of Engine Compartment Courtesy of GENERAL MOTORS CORP.



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Fig. 10: Left Front Of Engine Compartment (4.8L VIN V, 5.3L VIN T, 6.0L VIN U & 8.1L VIN G) Courtesy of GENERAL MOTORS CORP.



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Fig. 11: Left Side Of Engine (6.6L VIN 1) Courtesy of GENERAL MOTORS CORP.



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Electrical Component Locator

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