Mr2 Audio System

AUDIO SYSTEMPARTS LOCATION

−BODY ELECTRICAL SYSTEM AUDIO SYSTEMBE−114

2. SERVICE AREAThere are great differences in the size of the servicearea for AM, FM monaural, and FM stereo broadcastscannot be received even though AM comes in veryclearly.Not only does FM stereo have the smallest servicearea, but it also picks up static and other types of inter-ference (”noise”) easily.

3. RECEPTION PROBLEMSBesides the problem of static, there are also the prob-lems called ”fading”, ”multipath” and ”fade out”. Theseproblems are caused not by electrical noise but by thenature of the radio waves themselves.

FadingBesides electrical interference, AM broadcastsare also susceptible to other types of interference,especially at night. This is because AM radiowaves bounce off the ionosphere at night. Theseradio waves then interfere with the signals fromthe same transmitter that reach the vehicle’s an-tenna directly. This type of interference is called”fading”.

LF: low Frequency MF: Medium Frequency HF: High Frequency VHF: Very High Frequency

SYSTEM DESCRIPTION1. RADIO WAVE BAND

The radio wave bands used in radio broadcasting are as follows:


Fade OutBecause FM radio waves are of higher frequenciesthan AM radio waves, they bounce off buildings, moun-tains, and other obstructions. For this reason, FMsignals often seem to gradually disappear or fadeaway as the vehicle goes behind a building or otherobstruction. This is called ”fade out”.

4. COMPACT DISC PLAYERCompact Disc (hereafter called ”CD”) Players use alaser beam pick−up to read the digital signals recordedon the CD and reproduce analog signals of the music,etc. There are 4.7 in. (12 cm) and 3.2 in. (8 cm)discs in the CD player.HINT: Never attempt to disassemble or oil any part ofthe player unit. Do not insert any object other than adisc into the magazine.NOTICE: CD players use an invisible laser beam whichcould cause hazardous radiation exposure. Be sure to op-erate the player correctly as instructed.

MAINTENANCETape Player/Head Cleaning(a) Raise the cassette door with your finger.

Next using a pencil or like object, push in the guide.(b) Using a cleaning pen or cotton applicator soaked in

cleaner, clean the head surface, punch rollers andcapstans.

MultipathOne type of interference caused by the bouncing ofradio waves off of obstructions is called ”multipath”.Multipath occurs when a signal from the broadcasttransmitter antenna bounces off buildings andmountains and interferes with the signal that is re-ceived directly

CD Player/Disc CleaningIf the disc gets dirty, clean the disc by wiping thesurfaces from the center to outside in the radialdirections with a soft cloth.NOTICE: Do not use a conventional record cleaner oranti−static preservative.


TROUBLESHOOTINGNOTICE: When replacing the internal mechanism (computer part) of the audio system. be careful that nopart of your body or clothing comes in contact with the terminals of the leads from the IC, etc. of the re-placement part (spare part).

HINT: This inspection procedure is a simple troubleshooting which should be carried out on the ve-hicle during system operation and is based on the assumption that the cause of trouble lies with thesystem components (except for the wires and connectors, etc.).Always inspect the trouble taking the following items into consideration.

• Open or short circuit of the wire harness

• Connector or terminal connection fault

• Troubleshooting items marked *indicate that ”Troubleshooting for ANTI −THEFT SYSTEM”should be carried out first.

Tape jammed, malfunction with tape speed or auto−reverse.

Noise produced by vibration or shock while driving.

Power coming in, but tape player not operating.

Power coming in, but CD player not operating.

Noise present, but AM − FM not operating.

Power coming in, but radio not operation.

APS, SKIP, RPT buttons not operating.

Cassette tape inserts, but no power.

Noise produced when engine starts.

Sound quality poor (Volume faint).

Sound quality poor (Volume faint).

Cassette tape cannot be inserted.

Reception poor (Volume faint).

Cannot set station select button.

Either AM or FM does not work.

Either speaker does not work.



Cassette tape will not eject.

Preset memory disappears.

Few preset turning bands.

CD inserts, but no power.

CD cannot be inserted.

No power coming in.

Sound quality poor.

Antenna − related.

CO will not eject.

Sound jumps.

Tape player

CD Player

Problem

Antenna

Radio

Noise

’15

No.


HINT:

• Refer to Owner’s Manual for operation details of ANTI−THEFT SYSTEM,

• When the ID number has been cancelled, reset the same number after completing the opera-tion, or inform the customer that it has been cancelled.

ANTI−THEFT SYSTEM operation condition.(ID number input error 9 times or less).Input ID number to cancel ANTI−THEFT SYSTEM, and check display.

Display E:ANTI−THEFT SYSTEMoperation condition.(ID number input error 10times or more.)

TROUBLESHOOTING FOR ANTI−THEFT SYSTEM

ANTI−THEFT SYSTEM notcancelled. (ID number inputerror 9 times or less).

Turn ignition key from LOCK position to ACC position.

ANTI−THEFT SYSTEM cancelled.Check audio system again.

Cancel ID number, refer to each malfunction item.

Cancel ID number, refer to each malfunction item.

(Liquid Crystal Display (LCD) for Audio System)

[SEC] display disappearsafter 1 second.

Take to designated radioservice station.

Refer to eachMalfunctionitem.

Take to designated radio service station.

Refer to eachmalfunction item.

Display A:ID Number is set.

Normal operation.

Normaloperation.

Normal operation.

Radio switch ON.

Radio switch ON.

Radio switch ON.

Display A − B Display C − A

Display D

Display D

Display B

Display6

Display B

Display E

Yes


Radio Radio −Tape Player Unit (Built−in Power Amplifier)Radio −Tape Player Unit (Separate Power Amplifier)

Is ACC for the radio assemblybeing output from the poweramplifier?

Check if GND (wire harness side) to power amplifier is OK?

Check if GND (wire harness side) toradio is OK?

NO POWER COMING IN

Check if GND (wire harness side) to radio is OK?

Is there continuity in GNDwire harness?

Is ACC applied to power amplifier?

Is tape player operating normally?

Is ACC applied to radio assembly?

Check if RAD CIG fuse is OK?

Power amplifierfaulty.

Is ACC applied to radio?ACC wire harness faulty.

ACC wire harness faulty.

Radio assembly faulty.

Power amplifier faulty.


Replace fuse.

Radio faulty.

Radio

GND faulty.

Yes

Yes

Yes

Yes

Yes

Yes


[R] Radio [U] Radio −Tape Player Unit (Built−in Power Amplifier)[P] Radio −Tape Player Unit (Separate Power Amplifier)[A] Antenna w/o Motor [M] Motor Antenna [D] Motor Antenna and Glass Printed Antenna

POWER COMING IN, BUT RADIO NOT OPERATING

Do speakers pops when the volume switch isturned to maximum and then the power isswitched ON?

Is power for the antennabeing output from thepower amplifier?

Is power for the antennabeing output from the radioor radio assembly?

Temporarily install another speakerFunction OK?

Is there continuity in speaker wireharness?

Power amplifier faulty. Recheck system after repair.

Radio assembly faulty. Recheck system after repair.

Is power for the antenna beingoutput from the radio?

is tape player operating normally?

Hissing sound from speaker?

Speaker wire harness faulty.

Radio assemblyfaulty.

Radio amplifierfaulty.



If radio sidefaulty

If radio side faulty


Speaker faulty.

Radio faulty.

Radio faulty.

Go to No.23.

Go to No.23.

Go to No.23.

Radio

Yes

Yes

Yes

Yes

Yes

Yes

Yes




NOISE, PRESENT, BUT AM−FM NOT OPERATING

EITHER SPEAKER DOES NOT WORK

Is power for the antenna being outputfrom the power amplifier?

Is power for the antenna being output fromthe radio or radio assembly.

Temporarily install another speaker.Function OK?





Is hiss produced by non−functioning speaker?

Is there continuity in speaker wire harness?


Is tape player operating normally? Radio or radio assembly faulty.

Radio or radio assembly faulty.









Speaker faulty.

Radio faulty.

Radio faulty.

Go to No.23.

Radio

Radio

Yes

Yes

Yes

Yes

Yes

Yes

Yes

No

Yes


EITHER AM OR FM DOES NOT WORK, RECEPTIONPOOR (VOLUME FAINT), FEW PRESET TUNING BANDS

Radio Radio −Tape Player Unit (Built−in Power Amplifier)Radio−Tape Player Unit (Separate Power Amplifier)

Is power for the antenna being output fromthe power amplifier?

Is power for the antenna being output fromthe radio or radio assembly?

Temporarily install another speaker.Functions OK?

Problem with radio wave signals orlocation?




Are both AM and FM defective?


Poor signals, poor location.






Speaker faulty.

Radio faulty.

Radio faulty.

G o to N o. 23.

Radio

Yes

Yes

Yes

Yes

Yes

Yes

Yes


Radio Radio −Tape Player Unit (Built−in Power Amplifier)Radio − Tape Player Unit (Separate Power Amplifier)

Radio assembly or power amplifier faulty. Recheck system after repair.

Is power for the antenna beingoutput from the powerassembly?

Is power for the antenna beingoutput from the radio or radioassembly?

Temporarily install another speaker.Function OK?

SOUND QUALITY POOR

Is sound quality bad incertain areas only?


Is sound quality always bad?

Is speaker properly installed?

Poor signals, poorlocation.

Power amplifierfaulty.

Radio or radioassembly faulty.




If radio sidefaulty


Speaker faulty.

Install properly.

Radio faulty.

Radio faulty.

Go to No.23.

Go to No.23.

Radio

Yes

Yes

Yes

Yes

Yes

Yes

Yes

[R] [U] [P]



CANNOT SET STATION SELECT BUTTON, PRESETMEMORY DISAPPEARS

Check if GND (wire harness side) to radio orradio assembly?

Check if G N D (wire harness side) to power amplifier?

Can cassette tape be inserted i n tape player?

Is + B applied to radio or radio assembly?

Is +6 applied to power amplifier?


Check if DOME fuse is OK?

+6 wire harness faulty.

+ B wire harness faulty.




Replace fuse.

GND faulty.

G ND faulty.

Radio

Yes

Yes

Yes


Radio − Tape Player Unit (Built−in Power Amplifier)Radio − Tape Player Unit (Separate Power Amplifier)

Check if GND (wire harness side) to power amplifier Is OK?

Check If GND (wire harness side) to radioassembly is OK?

Is there a foreign object inside tapeplayer?

CASSETTE TAPE CANNOT BE INSERTED−

Is auto search button of radiooperating normally?

Is +B applied to power amplifier?

Is +B applied to radio assembly?


Remove foreign object.

+B wire harness faulty.






Tape Player

Replace fuse.

GND faulty.

GND faulty.

Yes

Yes

Yes

Yes

[P]



Is power for the radio assemblybeing output from the poweramplifier?

CASSETTE TAPE INSERTS, BUT NO POWER


Is ACC applied radio assembly?

Check if CIG & RAD fuse if OK?

Is radio operating normally?






Tape Player

Replace fuse.

Yes

Yes

Yes

Yes




POWER COMING IN, BUT TAPE PLAYER NOTOPERATING


1s hiss produced by non−functioningspeaker?




Functions OK if different cassette tapeinserted?





Radio amplifier faulty. Recheck system after repair.











Cassette tape faulty.

Tape Player

Tape Player

Speaker faulty.

Speaker faulty.

Yes

Yes

YesYes

Yes

Yes

Yes

Yes

Yes

No


Cassette tape faulty. (Less than 3 secs. of silence between songs (APS, RPT). Less than 15 seas. of silence (SKIP).)

TAPE JAMMED, MALFUNCTION WITH TAPE SPEED ORAUTO−REVERSE

[U] : Radio − Tape Player Unit (Built−in Power Amplifier)[P] : Radio − Tape Player Unit (Separate Power Amplifier)

SOUND QUALITY POOR (VOLUME PAINT)

APS, SKIP, RPT BUTTONS NOT OPERATING

Function OK if different cassette tapeinserted?

Operates normally after cleaning theheads?

Is there a foreign object inside tapeplayer?

Temporarily Install another speaker.Functions OK?

Functions OK if different tape flossthan 120 mins.) Is inserted?

Functions OK if different cassette tapeinserted?

Operates normally after cleaningthe heads?

Radio assembly or power amplifier faulty.

Is speaker properly Installed?


Remove foreign object.







Tape Player

Tape Player

Tape Player

Install properly.

Speaker faulty.

Head dirty.

Head dirty.

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes


: Radio − Tape Player Unit (Built−in Power Amplifier): Radio − Tape Player Unit (Separate Power Amplifier)


CASSETTE TAPE WILL NOT EJECT










Cassette tape jammed.

Tape Player

Replace fuse.

Yes

Yes

Yes

Yes


Is there continuity in ACC wire harnessbetween the radio assembly and thepower amplifier?

Check if GND (wire harness side) to radioassembly is OK?

Check if GND (wire harness side) topower amplifier is OK?


Check if GND (wire harnessside) to CD player is OK?

CD INSERTS, BUT NO POWER


Is ACC applied to radio assembly?

CD CANNOT BE INSERTED



Check If CIG & RAD fuse is OK?

Is ACC applied to CD player?Is radio operating normally?

Is +B applied to CD player?










Is CD already inserted?

CD player faulty.

CD player faulty.

CD Player

CD Player

Replace fuse.

Replace fuse.

G N D faulty.

Eject CD.

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes


POWER COMING IN, BUT CD PLAYER NOT OPERATING

Temporarily Install another speaker.Functions OK?




Has sudden temperature changeoccurred inside cabin?

Formation of condensation due to temp, change.

Does sound jump only duringstrong vibration?

Has sudden temperaturechange occurred inside cabin?

Functions OK if different CDinserted?

Formation of condensationdue to temp. change

Functions OK if different CD inserted?

Is temperature inside cabin hot?


Protective circuit inoperation.

Is CD player properly installed?

Is CD inserted correct side up?

Jumping caused by vibration.



SOUND JUMPS

CD player faulty.

CD player faulty.

Install properly.

Insert correctly.

Speaker faulty.

CD Player

CD Player

CD faulty.

CD faulty.

Yes

Yes

Yes

Yes

Yes

YesYes

Yes

Yes

Yes

Yes

Yes


SOUND QUALITY POOR (VOLUME FAINT)

Is hiss produced by non−functioningspeaker?


Temporarily install another speaker.Functions OK.

Radio assembly, CD player or power amplifier faulty.





Functions OK if different CDinserted?




Is radio operating normally? CD player faulty.

CD player faulty.

Install properly.

Speaker faulty.

Speaker faulty.

CD Player

CD Player

CD faulty.

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes


Is there continuity in +8wire harness between theradio assembly and the poweramplifier?


Is +B applied to power assembly?


Is +B applied to CD player? Radio assemblyfaulty.

CD WILL NOT EJECT

Check If DOME fuse is OK?





CD player faulty.

CD Player

Replace fuse.

Yes

Yes

Yes

YesYes


Is power related to the antenna beinginput to the antenna motor control relay?

Check continuity between antenna motorcontrol relay and radio.

Temporarily install another antenna.Functions OK?

Temporarily install another antenna.Functions OK?

Does antenna extend when radioswitch ON?

: Motor Antenna and Glass Printed Antenna

Inspect antenna control relay.(Relay circuit)

Inspect antenna motor. (See page BE−138)

Inspect glass printed antenna

Motor antennafaulty.

ANTENNA−RELATED

Glass printedantenna faulty.

: Antenna w/o Motor

Antenna motor faulty.

Is antenna extended?

Wire harness faulty.

Relay circuit faulty.

Radio side faulty.

Radio side faulty.

: Motor Antenna

Radio side faulty.

Antenna faulty.

Relay faulty.

Extend fully.

Antenna

YesYes

Yes

Yes

Yes


NOISE PRODUCED BY VIBRATION OR SHOCK WHILEDRIVING

Clicking sound heard when horn button ispressed, then released. Whirring/grating sound when pushed continuously.

Whistling noise which becomes high−pitched whenaccelerator strongly depressed, disappears shortlyafter engine stops.

Scratching noise occurs during suddenacceleration, driving on rough roads or whenignition switch is turned on.

Noise produced by static electricity accumulating in the vehicle body.

Scratching noise occurs while engine is running,continues a while even after engine stops.

With vehicle stopped, lightly tap each system.Is noise produced?

Tick−tock noise, occurs in co−ordination withblinking of flasher.

NOISE PRODUCED WHEN ENGINE STARTS

Noise occurs during window washer operation.

Whining noise occurs when A/C is operating.

Murmuring sound, stops when engine stops.

Scraping noise in time with wiper beat.

Is each system correctly installed?


Water temp. gauge noise.

Other type of noise.

Each system faulty.

Turn signal noise.

Fuel gauge noise.

Install properly.

Alternator noise.

Ignition noise.

Washer noise.

Wiper noise.

Horn noise.

A/C noise.

Noise

Noise

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes

Yes


ANTENNA ROD REMOVAL ANDINSTALLATION1. REMOVE ANTENNA ROD

HINT: Perform this operation with the negative (−)terminal cable connected to the battery.(a) Turn the ignition switch to ”LOCK” position.(b) Remove the antenna nut.(c) Press the ”AM” button on the radio receiver, and simul-

taneously turn the ignition switch to ”ACC” position.HINT:

• The rod will extend fully and be released from themotor antenna.

• After removing the antenna rod, leave the ignitionswitch at ”ACC”.

NOTICE: To prevent body damage when the antenna rodis released, hold the rod while it comes out.

2. INSTALL ANTENNA ROD(a) Insert the cable of the rod until it reaches the bottom.HINT: When inserting the cable, the teeth on the cablemust face toward the rear of the vehicle.(b) Wind the cable to retract the rod by turning the ignition

switch to ”LOCK” position.HINT:

• If the ignition switch is already in ”LOCK” position,perform step 1 (c) first, then turn the ignition switchto ”ACC” position.

• In case the cable is not wound, twist it as shown inthe illustration.

• Even if the rod has not retracted fully, install the an-tenna nut and inspect the antenna rod operation. Itwill finally retract fully.

(c) Inspect the antenna rod operation by pushing the ra-dio wave band select buttons.


ANTENNA MOTOR CONTROL RELAYINSPECTION

INSPECT ANTENNA MOTOR CONTROL RELAY CIR−CUITDisconnect the connector from the relay and inspectthe connector on wire harness side, as shown in thechart.

If circuit is as specified, replace the relay.

Ignition switch position ACC or ONRadio switch of cassette ON

Ignition switch position ACC or ONRadio switch and cassette OFF

Ignition switch position ACC or ONRadio switch ON and cassette OFF

Ignition switch position ACC or ONRadio switch OFF or cassette ON

Ignition switch position LOCK or ACC

Tester connection toterminal number

Ignition switch position ACC or ON

Ignition switch position LOCK



Ignition switch position ON

Battery positive voltage





Specified condition

No voltage

No voltage

No voltage

No voltage

No voltage

No voltage

Continuity

Continuity

Condition

Constant

Constant

Constant


ANTENNA MOTOR INSPECTIONINSPECT ANTENNA MOTOR OPERATION(a) Connect the positive (+) lead from the battery to termi-

nal 1 and the negative (−) lead to terminal 4.(b) Check that the motor turns (moves upward).NOTICE: These tests must be performed quickly (within 3− 5 seconds) to prevent the coil from burning out.

(c) Then, reverse the polarity, check that the motor turnsthe opposite way (moves downward) to prevent thecoil from burning out.If operation is not as specified, replace the motor.

GLASS PRINTED ANTENNA INSPECTION1. INSPECT GLASS PRINTED ANTENNA

Use same procedure as for ”INSPECT DEFOGGERWIRES” on page BE−55.

2. REPAIR GLASS PRINTED ANTENNAUse same procedure as for ” REPAIR DEFOGGERWIRES” on page BE−56.


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