Audio System - Diagnostics: Diagnosis Toyota Sequoia I рестайлинг

PROBLEM SYMPTOMS TABLE

Note. For the troubleshooting procedures of the audio system with a navigation system, refer to the navigation system (See PROBLEM SYMPTOMS TABLE ).

DIAGNOSTIC TROUBLE CODE CHART

TERMS MEANING CHART

HINT

Titles for each unit are stated in the following order: parts name (physical address) and [Name indicated on the DTC display]

Scheme 1

Scheme 2

Scheme 3

Scheme 4

Scheme 5

Scheme 6

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Scheme 12

1. Radio receiver assy (physical address: 190) [AUDIO H/U] Logical address: 01 (Communication control) Logical address: 01 (Communication control) continued DIAGNOSIS VERIFICATION CHART DTC Name Diagnosis Verification E0 (1) Registration Completion Instruction Error "Registration Completion Instruction" command from master cannot be received. Since this DTC is provided for engineering purposes, it may be detected when no actual failure exists. E2 ON/OFF Instruction Parameter Error Error occurs in ON/OFF controlling command from master component. Replace radio receiver assy. E3 (1) Registration Request Transmission Receiving Connection Check Instruction, Registration Request command is output from sub-master component. Since this DTC is provided for engineering purposes, it may be detected when no actual failure exists. E3 (1) Registration Request Transmission Registration Request command is output from component shown by sub code. Since this DTC is provided for engineering purposes, it may be detected when no actual failure exists. E3 (1) Registration Request Transmission Receiving Connection Check Instruction, Registration Request command is output from sub-master component. Since this DTC is provided for engineering purposes, it may be detected when no actual failure exists. E4 (1) Multiple Frame Abort Multiple frame transmission is aborted. Since this DTC is provided for engineering purposes, it may be detected when no actual failure exists. (1) This code may be recorded depending on the battery condition or engine start voltage even if no failure is detected. Logical address: 61 (Cassette switch) Logical address: 62 (CD player) Logical address: 63 (In-dash CD changer)
2. Stereo component amplifier assy (physical address: 440) [DSP-AMP] Logical address: 01 (Communication control) Logical address: 01 (Communication control) continued
3. Multi-display controller sub-assy (Physical address: 1F6) [RSE ECU, MAIN] Logical address: 01 (Communication control) Rear seat audio controller (Physical address: 1F4) [RSA] Logical address: 01 (Communication control)

CIRCUIT DESCRIPTION

This circuit provides power to the radio receiver assy.

Scheme 13

Scheme 14

Scheme 15

Scheme 16

1. Inspect radio receiver assy. PREPARATION: Disconnect the radio receiver assy connector. CHECK: Measure the resistance according to the value(s) in the table below. OK: TERMINAL CONDITION SPECIFICATION CHART Symbol (Tester connection) Condition Specified condition GND (R2-7, R4-20) - Body ground Always Below 1 ohm CHECK: Measure the voltage according to the value(s) in the table below. OK: TESTER CONDITION SPECIFICATION CHART Symbol (Tester connection) Condition Specified condition BU+B (R2-4, R4-1) - GND (R2-7, R4-20) Always 10 to 14 V ACC+B (R2-3, R4-11) - GND (R2-7, R4-11) Ignition SW ACC 10 to 14 V NG: Repair or replace harness or connector (Radio receiver assy - battery or body ground). OK: Proceed to next circuit inspection shown in problem symptoms table or diagnostic trouble code chart (See «PROBLEM SYMPTOMS TABLE»(ref-227578-S20896547072006040600000) or «DIAGNOSTIC TROUBLE CODE CHART»(ref-227578-S07112227772006040600000) ).

This circuit provides power to the stereo component amplifier assy.

Scheme 17

Scheme 18

1. Inspect stereo component amplifier assy (B+, B2+, ACC, GND, E). PREPARATION: Disconnect the stereo component amplifier assy connector. CHECK: Measure the resistance according to the value(s) in the table below. OK: TESTER CONDITION SPECIFICATION CHART Symbol (Tester connection) Condition Specified condition E (S9-16) - Body ground Always Below 1 ohm GND (S9-15) - Body ground Always Below 1 ohm CHECK: Measure the voltage according to the value(s) in the table below. OK: TESTER CONDITION SPECIFICATION CHART Symbol (Tester connection) Condition Specified condition B+ (S9-1) - GND (S9-15) Always 10 to 14 V B2+ (S9-10) - GND (S9-15) Always 10 to 14 V ACC (S10-12) - GND (S9-15) Ignition SW ACC 10 to 14 V NG: Repair or replace harness or connector (Stereo component amplifier assy - battery or body ground). OK: Proceed to next circuit inspection shown in problem symptoms table or diagnostic trouble code chart (See «PROBLEM SYMPTOMS TABLE»(ref-227578-S20896547072006040600000) or «DIAGNOSTIC TROUBLE CODE CHART»(ref-227578-S07112227772006040600000) ).

This circuit sends an operation signal from the steering pad switch to the radio receiver assy.

If there is an open in the circuit, the audio system cannot be operated by the steering pad switch.

If there is a short in the circuit, the same condition as when the switch is continuously depressed occurs.

Therefore, not only the steering pad switch cannot operate the radio receiver assy, but also the radio receiver assy itself cannot function.

Scheme 19

INSPECTION PROCEDURE

Note. The vehicle is equipped with SRS (Supplemental Restraint System) such as airbags. Before servicing (including removal or installation of parts), be sure to read the precautionary notice for the supplemental restraint system (see SRS AIRBAG ).

Scheme 20

Scheme 21

Scheme 22

Scheme 23

1. Inspect steering pad switch assy. PREPARATION: Disconnect the radio receiver assy connector. CHECK: Measure the resistance according to the value(s) in the table below. OK: TESTER CONDITION SPECIFICATION CHART Symbol (Tester connection) Condition Specified condition SW1 (R19-7) - GND (R19-6) No switch is pushed Approx. 100 k ohm SW1 (R19-7) - GND (R19-6) SEEK+ switch: push Approx. 0 ohm SW1 (R19-7) - GND (R19-6) SEEK- switch: push Approx. 0.3 k ohm SW1 (R19-7) - GND (R19-6) VOL+ switch: push Approx. 1 k ohm SW1 (R19-7) - GND (R19-6) VOL- switch: push Approx. 3.2 k ohm SW2 (R19-8) - GND (R19-6) No switch is pushed Approx. 100 k ohm SW2 (R19-8) - GND (R19-6) MODE switch: push Approx. 0 ohm NG: Go to step 2. OK: Proceed to next circuit inspection shown in problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(ref-227578-S20896547072006040600000) ).
2. Inspect steering pad switch assy. PREPARATION: Disconnect the steering pad switch assy connector. CHECK: Measure the resistance according to the value(s) in the table below. OK: TESTER CONDITION SPECIFICATION CHART Symbol (Tester connection) Condition Specified condition AU1 (A-12) - EAU (A-10) No switch is pushed Approx. 100 k ohm AU1 (A-12) - EAU (A-10) SEEK+ switch: push Approx. 0 ohm AU1 (A-12) - EAU (A-10) SEEK- switch: push Approx. 0.3 k ohm AU1 (A-12) - EAU (A-10) VOL+ switch: push Approx. 1 k ohm AU1 (A-12) - EAU (A-10) VOL- switch: push Approx. 3.2 k ohm AU2 (A-11) - EAU (A-10) No switch is pushed Approx. 100 k ohm AU2 (A-11) - EAU (A-10) MODE switch: push Approx. 0 ohm NG: Replace steering pad switch assy. OK: Go to next step.
3. Inspect spiral cable sub-assy. PREPARATION: Disconnect the spiral cable sub-assy connector. CHECK: Measure the resistance according to the values in the table below. OK: TESTER CONDITION SPECIFICATION CHART Symbol (Tester connection) Specified condition EAU (A-10) - EAU (A-10) Below 1 ohm AU1 (A-12) - AU1 (A-12) Below 1 ohm AU2 (A-11) - AU2 (A-11) Below 1 ohm NG: Replace spiral cable sub-assy. OK: Repair or replace harness or connector (Radio receiver assy - spiral cable).

Power is supplied to the radio receiver panel illumination when the light control switch is in the TAIL or HEAD position. The body ECU determines the external brightness based on the brightness level detected by the automatic light control sensor, and then operates the tail relay. Power can also be supplied by operating the relay.

The intensity of the radio receiver panel illumination can be adjusted by the rheostat switch.

Scheme 24

Note. The vehicle is equipped with SRS (Supplemental Restraint System) such as airbags. Before servicing (including removal or installation of parts), be sure to read the precautionary notice for the supplemental restraint system (See SRS AIRBAG ).

Scheme 25

Scheme 26

Scheme 27

Scheme 28

Scheme 29

Scheme 30

Scheme 31

Scheme 32

Scheme 33

Scheme 34

Scheme 35

Scheme 36

Scheme 37

Scheme 38

1. Check illumination. CHECK: Check if the illumination for the radio receiver assy, steering pad switch assy or others (A/C switch, cigarette lighter, etc.) comes on when the light control switch is turned to the HEAD or TAIL position. RESULT: COMPONENTS WITH ILLUMINATION CHART Components with illumination Go to step Illumination comes on for all components except radio receiver assy. A Illumination comes on for all components except steering pad switch does not come on. B Illumination comes on for all components except radio receiver assy, steering pad switch, Rear heater control panel, each switch, etc. C All illumination does not come on. (Radio receiver assy, steering pad switch, Combination meter, Rear heater control panel, each switch, etc.) D HINT: If the illuminations have malfunctions, check the rheostat switch. B: Go to step 4. C: Go to step 8. D: Go to combination meter system (See «OPERATING LIGHT CONTROL RHEOSTAT DOES NOT CHANGE LIGHT BRIGHTNESS»(ref-227584-S23623265822006040600000) ). A: Go to next step.
2. Check radio receiver assy (ILL+). PREPARATION: Disconnect the radio receiver assy connector. CHECK: Measure the voltage according to the value(s) in the table below. OK: TESTER CONDITION SPECIFICATION CHART Symbol (Tester connection) Condition Specified condition ILL+ (R2-10) - Body ground (1) Light control switch TAIL 10 to 14 V ILL+ (R4-2) - Body ground (2) Light control switch TAIL 10 to 14 V (1) Built-in Type Amplifier (2) Separate Type Amplifier *1: Separate Type Amplifier *2: Built-in Type Amplifier NG: Repair or replace harness or connector (Radio receiver assy - battery) OK: Go to next step.
3. Check harness and connector (Radio receiver assy - Light control rheostat). PREPARATION: Disconnect the radio receiver assy connector and light control rheostat connector. CHECK: Measure the resistance according to the value(s) in the table below. OK: TESTER CONDITION SPECIFICATION CHART Symbol (Tester connection) Specified condition ILL- (R3-5) - ILL- (R6-6) ( (2) ) Below 1 ohm ILL- (R4-12) - ILL- (R6-6) ( (1) ) Below 1 ohm ILL- (R6-6) - Body ground ( (1) ) 10 k ohm or higher (1) Separate Type Amplifier (2) Built-in Type Amplifier NG: Repair or replace harness or connector. OK: Replace radio receiver assy.
4. Check radio receiver assy. PREPARATION: Disconnect the radio receiver assy connector. CHECK: Measure the voltage according to the value(s) in the table below. OK: TESTER CONDITION SPECIFICATION CHART Symbol (Tester connection) Condition Specified condition GND (R19-6) - Body ground Light control switch TAIL 10 to 14 V OK: Replace radio receiver assy. NG: Go to next step.
5. Inspect steering pad switch assy. PREPARATION: Disconnect the steering pad switch connector. Connect the positive (+) lead to terminal 1 and the negative (-) lead to terminal 10 of steering pad switch assy connector. CHECK: Check if the illumination for the steering pad switch assy comes on. OK: Illumination for the steering pad switch assy comes on. NG: Replace steering pad switch assy. OK: Go to next step.
6. Inspect spiral cable sub-assy. PREPARATION: Remove the spiral cable sub-assy. CHECK: Measure the resistance according to the value(s) in the table below. OK: TESTER CONDITION SPECIFICATION CHART Tester connection Condition Specified condition A-1 - C9-1 Always Below 1 ohm A-10 - C9-10 Always Below 1 ohm NG: Replace spiral cable sub-assy. OK: Go to next step.
7. Check harness and connector (Radio receiver assy - Spiral cable sub-assy). PREPARATION: Disconnect the spiral cable sub-assy connector. CHECK: Measure the resistance according to the value(s) in the table below. OK: TESTER CONDITION SPECIFICATION CHART Symbol (Tester connection) Condition Specified condition GND (R19-6) - Spiral cable terminal 10 Always Below 1 ohm GND (R19-6) - Body ground Always 10 k ohm or higher NG: Repair or replace wire harness or connector (Radio receiver assy - spiral cable sub-assy). OK: Repair or replace wire harness or connector (Battery - spiral cable sub-assy).
8. Check light control rheostat. PREPARATION: Reconnect the light control rheostat switch connector. Ignition switch is ON. Light control switch is TAIL or HEAD. CHECK: Measure the voltage according to the value(s) in the table below. OK: TESTER CONDITION SPECIFICATION CHART Symbol (Tester connection) Condition Specified condition ILL- (R6-6) - Body ground Rheostat knob to fully counterclockwise --> fully clockwise Below 1 V --> 10 to 14 V NG: Replace light control rheostat. OK: Go to next step.
9. Check harness and connector (Light control rheostat - Body ground). PREPARATION: Disconnect the light control rheostat connector. CHECK: Measure the resistance according to the value(s) in the table below. OK: TESTER CONDITION SPECIFICATION CHART Symbol (Tester connection) Specified condition E (R6-5) - Body ground Below 1 ohm NG: Repair or replace harness or connector. OK: Repair or replace wire harness or connector (Battery - spiral cable sub-assy).

This circuit sends a signal to the stereo component amplifier to mute noise. Because of that, the noise produced by changing the sound source ceases.

If there is an open in the circuit, noise can be heard from the speakers when changing the sound source. If there is a short in the circuit, even though the stereo component amplifier assy is normal, no sound or only an extremely small sound can be produced.

Scheme 39

Scheme 40

Scheme 41

Scheme 42

Scheme 43

1. Inspect stereo component amplifier assy. PREPARATION: Make sure that the stereo component amplifier assy connector is connected. CHECK: Measure the voltage according to the value in the table below. OK: TESTER CONDITION SPECIFICATION CHART Symbol (Tester connection) Condition Specification MUTE (S10-1) - Body ground Turn ignition switch to ACC, Audio system is playing --> Changing mode Above 3.5 V --> Below 1 V OK: Proceed to next circuit inspection shown in problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(ref-227578-S20896547072006040600000) ). NG: Go to next step.
2. Check harness and connector (Radio receiver assy - Stereo component amplifier assy). PREPARATION: Disconnect the radio receiver assy and stereo component amplifier assy connector. CHECK: Measure the resistance according to the value(s) in the table below. OK: TESTER CONDITION SPECIFICATION CHART Symbol (Tester connection) Condition Specified condition MUTE (R4-7) - MUTE (S10-1) Always Below 1 ohm MUTE (R4-7) - Body ground Always 10 kohm or higher NG: Repair or replace harness or connector. OK: Go to next step.
3. Inspect radio receiver assy. PREPARATION: Reconnect the radio receiver assy connector. CHECK: Measure the voltage according to the value(s) in the table below. OK: TESTER CONDITION SPECIFICATION CHART Symbol (Tester connection) Condition Specified condition MUTE (R4-7) - Body ground Ignition switch ON Above 3.5 V OK: Replace stereo component amplifier assy. NG: Replace radio receiver assy.

The radio receiver assy sends a sound signal to the stereo component amplifier assy through this circuit. The sound signal that has been sent is amplified by the stereo component amplifier assy, and then sent to the speakers.

If there is an open or short in the circuit, sound cannot be heard from the speakers even if there is no malfunction in the stereo component amplifier assy or the speakers.

Scheme 44

Scheme 45

Scheme 46

1. Check harness and connector (Radio receiver assy - Stereo component amplifier assy). PREPARATION: Disconnect the radio receiver assy and stereo component amplifier assy connector. CHECK: Measure the resistance according to the value(s) in the table below. OK: TESTER CONDITION SPECIFICATION CHART Symbol (Tester connection) Specified condition L+ (R4-9) - L+ (S10-3) Below 1 ohm L- (R4-19) - L- (S10-2) Below 1 ohm R+ (R4-8) - R+ (S10-5) Below 1 ohm R- (R4-18) - R- (S10-4) Below 1 ohm L+ (R4-9) - Body ground 10 k ohm or higher L- (R4-19) - Body ground 10 k ohm or higher R+ (R4-8) - Body ground 10 k ohm or higher R- (R4-18) - Body ground 10 k ohm or higher NG: Repair or replace harness or connector. OK: Proceed to next circuit inspection shown in problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(ref-227578-S20896547072006040600000) ).

The sound signal that has been amplified by the stereo component amplifier is sent to the speakers from the stereo component amplifier through this circuit.

If there is a short in this circuit, the stereo component amplifier assy (built-in amp) detects it and stops output to the speakers.

Thus sound cannot be heard from the speakers even if there is no malfunction in the stereo component amplifier assy (built-in amp) or the speakers.

Scheme 47

Scheme 48

Scheme 49

Scheme 50

Scheme 51

Scheme 52

Scheme 53

Scheme 54

Scheme 55

Scheme 56

1. Check apparatus. CHECK: Choose the apparatus to be inspected. APPARATUS CHART Apparatus Go to step Separate type amplifier A Built-in type amplifier B B: Go to step 6 . A: Go to next step.
2. Check harness and connector (Stereo component amplifier assy - Speaker assy). PREPARATION: Disconnect the connectors from the radio receiver assy and speakers. CHECK: Measure the resistance between the speaker and the stereo component amplifier to check for an open circuit in the wire harness. OK: Below 1 ohm CHECK: Measure the resistance between each speaker and body ground to check for a short circuit in wire harness. OK: 10 k ohm or higher HINT: Refer to the wiring diagram for connection of each terminal. NG: Repair or replace harness or connector. OK: Go to next step.
3. Inspect front door speaker and woofer. CHECK: Measure the resistance according to the value(s) in the table below. NOTE: The speaker should not be removed for checking. OK: TESTER CONDITION SPECIFICATION CHART Tester connection Specified condition 1 - 2 Approx. 3.15 ohm 3 - 4 Approx. 2.78 ohm NG: Replace front door speaker and woofer. OK: Go to next step.
4. Inspect tweeter. CHECK: Check that malfunction disappears when another tweeter in good condition is installed. OK: Malfunction disappears. HINT: Connect all the connectors to the speakers. When there is a possibility that either right or left front speaker is defective, inspect by interchanging the right one and the left one. OK: Replace tweeter. NG: Go to next step.
5. Inspect rear speaker assy. CHECK: Measure the resistance between the terminals of the speaker. NOTE: The speaker should not be removed for checking. OK: 2.6 +/- 0.2 ohm NG: Replace rear speaker assy. OK: Proceed to next circuit inspection shown in problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(ref-227578-S20896547072006040600000) ).
6. Check harness and connector (Radio receiver assy - Speaker assy). PREPARATION: Disconnect the connectors from the radio receiver assy and speakers. CHECK: Measure the resistance between the speaker and the radio receiver assy to check for an open circuit in the wire harness. OK: Below 1 ohm CHECK: Measure the resistance between each speaker and body ground to check for a short circuit in wire harness. OK: 10 kohm or higher HINT: Refer to the wiring diagram for connection of each terminal. NG: Repair or replace harness or connector. OK: Go to next step.
7. Inspect front door speaker assy. CHECK: Measure the resistance between the terminals of the speaker. NOTE: The speaker should not be removed for checking. OK: Approximately 4 ohm NG: Replace front door speaker assy. OK: Go to next step.
8. Inspect tweeter assy. CHECK: Check that malfunction disappears when another tweeter in good condition is installed. OK: Malfunction disappears. HINT: Connect all the connectors to the speakers. When there is a possibility that either right or left front speaker is defective, inspect by interchanging the right one and the left one. OK: Replace tweeter. NG: Go to next step.
9. Inspect rear speaker assy. CHECK: Measure the resistance between the terminals of the speaker. NOTE: The speaker should not be removed for checking. OK: Approximately 4 ohm NG: Replace rear speaker assy. OK: Proceed to next circuit inspection shown in problem symptoms table (See «PROBLEM SYMPTOMS TABLE»(ref-227578-S20896547072006040600000) ).

Each unit of the audio system connected to the AVC-LAN (communication bus) transfers the signal of each switch by communication.

When a short to +B or short to ground occurs in this AVC- LAN, the audio system will not function normally as communication is discontinued.

In this AVC-LAN, the radio receiver assy becomes the master of the communication, and the radio receiver assy has resistance necessary for communication.

Scheme 57

Scheme 58

Scheme 59

Scheme 60

1. Inspect radio receiver assy. PREPARATION: Disconnect the radio receiver assy connector. CHECK: Measure the resistance according to the value(s) in the table below. OK: TESTER CONDITION SPECIFICATION CHART Symbol (Tester connection) Condition Specified condition TX+(R4-5) - TX- (R4-15) Always 60 to 80 ohm NG: Replace radio receiver assy. OK: Go to next step.
2. Check harness and connector (Radio receiver assy - Stereo component amplifier assy). PREPARATION: Disconnect the stereo component amplifier assy connector. CHECK: Measure the resistance according to the values in the table below. OK: TESTER CONNECTION SPECIFIED CONDITION Symbol (Tester connection) Specified condition TX+ (R4-5) - TX+ (S10-20) Below 1 ohm TX- (R4-15) - TX- (S10-19) Below 1 ohm TX+ (R4-5) - Body ground 10 kohm or higher TX- (R4-15) - Body ground 10 kohm or higher NG: Repair or replace harness or connector. OK: Proceed to next circuit inspection shown on problem symptoms table or diagnostic trouble code chart (See «PROBLEM SYMPTOMS TABLE»(ref-227578-S20896547072006040600000) or «DIAGNOSTIC TROUBLE CODE CHART»(ref-227578-S07112227772006040600000) ).

1. Adjust sound quality. CHECK: Set "BASS" and "TREB" to the initial values and check if sounds is normal. OK: Malfunction disappears. OK: System is OK. NG: Go to next step.
2. Replace stereo component amplifier assy. Replace the stereo component amplifier assy and check if it operates normally. OK: Malfunction disappears. NG: Replace radio receiver assy. OK: End.

1. Check of speaker installation. CHECK: Check if each speaker is securely installed. OK: Each speaker is securely installed. HINT: The radio is equipped with a noise prevention system that blocks excessively loud noise. If such noise occurs, check the all wiring is proper and that the antenna installation part ground and noise-prevention equipment are installed. NOISE OCCURS CHART Condition in which noise occurs Noise type Noise increases when the accelerator pedal is depressed, but stops when the engine is stopped. Generator noise Noise occurs during A/C or the heater operation. Blower motor noise Noise occurs when the vehicle accelerates rapidly on an unpaved road or after the ignition switch is turned on. Fuel pump noise Noise occurs when the horn switch is pressed and released or when pressed and held. Horn noise Quiet noise occurs while the engine is running, but stops when the engine is stopped. Ignition noise Noise occurs synchronously with the blink of the turn signal. Flasher noise Noise occurs during window washer operation. Washer noise Noise occurs while the engine is running, and it continues even after the engine is stopped. Water temperature sensor noise Noise occurs during wiper operation. Wiper noise Noise occurs when the brake pedal is depressed. Stop light switch noise Others. Static electricity stored on the vehicle HINT: Identify the condition under which the noise occurs, and check the noise filter on the related part. First ensure that the noise is not coming from the outside. Failure to do so makes noise source detection difficult and may lead to a misdiagnosis. Noise should be removed in descending order of loudness. NG: Install it properly. OK: Identification of noise source (See «IDENTIFICATION OF NOISE SOURCE»(ref-227578-S04114843422006040600000) ).

Scheme 61

1. Check if radio auto-search functions properly. CHECK: Check if the radio auto-search functions properly. Perform the auto-search of the radio and check that it functions normally. OK: The radio auto-search functions properly. OK: Replace radio receiver assy. NG: Go to next step.
2. Check optional component. CHECK: Check for any optional component (sun shade film, telephone antenna etc.). Check whether or not any optional component such as a sun shade film and telephone antenna is installed. OK: Optional component is not installed. NG: Effect from optional component. OK: Go to next step.
3. Check antenna for noise production. CHECK: Noise Check with Antenna With the ignition switch in the ACC position, turn on the radio and choose the AM mode. Place the tip of a screwdriver on the antenna of the rear glass antenna, and check that noise is heard from the speakers. OK: Noise occurs. OK: Replace radio receiver assy. NG: Go to next step.
4. Inspect radio receiver assy (Antenna). CHECK: Preparation for Check Remove the antenna plug of the radio receiver assembly. Noise Check With the radio receiver assy connector connected, turn the ignition switch to the ACC position. Turn on the radio and choose the AM mode. Place a screwdriver or a piece of metal such as thin wire on an antenna jack of the radio receiver assy and check that noise is heard from the speaker. OK: Noise occurs. NG: Replace radio receiver assy. OK: Replace antenna cord sub-assy.

Scheme 62

1. Check if a normal CD is inserted. CHECK: Check if a normal CD is inserted. Make sure that the CD is a normal audio CD, and that there is no deformation, flaw, stain, burr or other defects on the CD. OK: Normal audio CD is inserted. HINT: Translucent or oddly-shaped CDs cannot be played. Computer CD-ROMs (even those with music) and CD-R discs cannot be played. Playing an 8-cm (3.2 in.) CD does not require an adapter. NG: End. OK: Go to next step.
2. Check if a CD is inserted properly. CHECK: Check if a CD is inserted properly. Check whether or not the CD is inserted upside down. OK: Not upside down. NG: Set disc correctly. OK: Go to next step.
3. Disc cleaning. PREPARATION: Disc cleaning If the disc gets dirty, clean the disc by wiping the surface from the center to outside in a radial direction with a soft cloth. NOTE: Do not use a conventional record cleaner or anti-static preservative. OK: Malfunction disappears. OK: End. NG: Go to next step.
4. Replace CD with another and recheck. PREPARATION: Replace the CD with another and recheck. CHECK: Replace the CD with another normal one to see if the same trouble occurs again. OK: Malfunction disappears. NG: Replace radio receiver assy. OK: End.

1. Press "EJECT" and check operation. CHECK: Press "EJECT" and check the operation. Press the CD EJECT switch of the radio receiver assembly for 2 seconds or more to see if the CD is ejected. OK: CD is ejected. HINT: If the CD is not ejected, bring the vehicle in for repair. Do not attempt to remove it by force. NG: Replace radio receiver assy. OK: Go to next step.
2. Replace CD with another and recheck. CHECK: Insert another CD and check if it is ejected. OK: The disc is ejected. NG: Replace radio receiver assy. OK: End.

1. Replace CD with another and recheck. CHECK: Insert another CD and check if it is ejected. OK: Malfunction disappears. NG: Replace radio receiver assy. OK: End.

1. Check for any foreign object. CHECK: Check for any foreign objects. Check that no foreign objects or defects are detected in the cassette tape player of the radio receiver assembly. OK: No foreign objects or defects are detected. NG: Remove foreign object. OK: Go to next step.
2. Check cassette tape. CHECK: Check the cassette tape. Check that the cassette tape is a normal tape with music or voice recorded. OK: Proper cassette tape with music or voice recorded. NG: End. OK: Go to next step.
3. Replace cassette tape with another and recheck. CHECK: Replace the cassette tape with another one and recheck. Replace the cassette tape with another normal one to see if the same trouble occurs again. OK: The function returns to be normal. NG: Replace radio receiver assy. OK: End.

1. Press "EJECT" and check operation. CHECK: Press "EJECT" and check the operation. Press the cassette tape EJECT switch of the radio receiver assembly for 2 seconds or more and check that the cassette tape is ejected. OK: The cassette tape is ejected. NG: Replace radio receiver assy. OK: Go to next step.
2. Check cassette tape. CHECK: Check the cassette tape. Check that the ejected cassette tape does not have a peeled label, a cassette body deformation or any other defect. OK: No fault on the cassette tape. NG: End. OK: Go to next step.
3. Replace cassette tape with another and recheck. CHECK: Replace the cassette tape with another and recheck. Replace the cassette tape with another normal one to see if the same trouble occurs again. OK: Malfunction disappears. NG: Replace radio receiver assy. OK: End.

Scheme 63

1. Replace cassette tape with another and recheck. CHECK: Replace the cassette tape with another one and recheck. Replace the cassette tape with another normal one to see if the same trouble occurs again. OK: Malfunction disappears. OK: End. NG: Go to next step.
2. Check for any foreign object. CHECK: Check for foreign objects. Check that no foreign objects or defects are detected in the cassette tape player. OK: No foreign objects or defects are detected. NG: Remove foreign objects. OK: Go to next step.
3. Clean head and check operation. PREPARATION: Head cleaning Raise the cassette door with your finger. Using a pencil or similar object, push in the guide. Using a cleaning pen or cotton applicator soaked in cleaner, clean the head surface, pinch rollers and capstans. CHECK: Check if the same trouble occurs again. OK: Malfunction disappears. NG: Replace radio receiver assy. OK: End.

Scheme 64

1. Check for any foreign object. CHECK: Check for any foreign objects. Check that no foreign objects or defects are detected in the cassette tape player of the radio receiver assy. OK: No foreign objects or defects are detected. NG: Remove foreign object. OK: Go to next step.
2. Replace cassette tape with another and recheck (90 min. or less). CHECK: Replace the cassette tape with another one and recheck. Replace the cassette tape with another normal one (90 minutes or less) to see if the same trouble occurs again. OK: Malfunction disappears. OK: End. NG: Go to next step.
3. Clean head and check operation. PREPARATION: Head cleaning Raise the cassette door with your finger. Using a pencil or similar object, push in the guide. Using a cleaning pen or cotton applicator soaked in cleaner, clean the head surface, pinch rollers and capstans. CHECK: Check if the same trouble occurs again. OK: Malfunction disappears. NG: Replace radio receiver assy. OK: End.

See also:
• ADJUSTMENT