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NO.4 NO SOUND FROM CERTAIN SPEAKER

id0903a1803300

4 | No sound from certain speaker/Possible DTC: -
TROUBLESHOOTING HINTS
• Speaker malfunction (e.g., any foreign material. broken). • Poor connection of audio unit connector, terminal damage. • BOSE amplifier unit malfunction. • Audio unit malfunction. • Short circuit in wiring harness between BOSE amplifier unit and speaker. • Short circuit inside speaker. • Open circuit in wiring harness between BOSE amplifier unit and speaker. • Open or short circuit in wiring harness between BOSE amplifier unit and audio unit. • Poor connection of BOSE amplifier unit connector.

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | • Turn the audio unit to ON. • Press AUDIO CONT button more than one second (BAL/FAD cancel mode). • Press both POWER and AUTO-M buttons more than 1 second at the same time. Note The sounded speaker now changes in the order of left -front speaker, right-front speaker, right-rear speaker and left-rear speaker. • Is there any speaker with no sound? | Yes | If no sound from some speaker • Go to the next step. If no sound at all • Go to the troubleshooting of "No.3 No sound at all"
No | The troubleshooting is completed.
2 | • Does the same speaker have no sound if changing the sound source? (radio, CD, cassette tape). | Yes | Go to the next step.
No | Replace the audio unit. Note • If the different speaker has no sound now, the audio unit is malfunctioning.
3 | • Turn the ignition switch to the LOCK position. • Inspect the connection of the audio unit connector (24-pin). (for sound signal line). • Is the connector connected securely? | Yes | Go to the next step.
No | Connect the audio unit connector (24-pin) securely.
4 | • Turn the ignition switch to the LOCK position. • Remove the audio unit. • Disconnect the audio unit connector (24-pin). • Inspect the continuity between the audio unit connector wiring harness-side connector terminal and ground: For front speaker - Terminal A (LH+) - GND - Terminal C (LH-) - GND - Terminal D (RH+) - GND - Terminal F (RH-) - GND For rear speaker - Terminal S (LH+) - GND - Terminal U (LH-) - GND - Terminal V (RH+) - GND - Terminal X (RH-) - GND - Is there continuity? | Yes | Go to the next step.
No | Go to the Step 6.
5 | • Turn the ignition switch to the LOCK position. • Disconnect the BOSE amplifier unit connector (26-pin) and the audio unit connector (24-pin). • Inspect the continuity between the BOSE amplifier unit wiring harness-side connector (26-pin) terminal and the audio unit wiring harness-side connector (24-pin) terminal. For front speaker - Terminal H (26-pin, L+IN) - Terminal A (24-pin, LH+) - Terminal G (26-pin, L+IN) - Terminal C (24-pin, LH+) - Terminal L (26-pin, R+IN) - Terminal D (24-pin, RH+) - Terminal K (26-pin, R+IN) - Terminal F (24-pin, RH+) For rear speaker - Terminal J (26-pin, L+IN) - Terminal S (24-pin, LH+) - Terminal I (26-pin, L+IN) - Terminal U (24-pin, LH+) - Terminal N (26-pin, R+IN) - Terminal V (24-pin, RH+) - Terminal M (26-pin, R+IN) - Terminal X (24-pin, RH+) - Is there the continuity? | Yes | Go to the next step.
No | Repair or replace the suspect wiring harness between the BOSE amplifier unit and audio unit. Go to the next step.
6 | • Turn the ignition switch to the LOCK position. • Inspect the connection of the BOSE amplifier unit connector (26-pin). • Is the connector connected securely? | Yes | Go to the next step.
No | Connect the BOSE amplifier unit connector (26-pin) securely.
7 | • Turn the ignition switch to the LOCK position. • Disconnect the BOSE amplifier unit connector (26-pin). • Inspect the continuity between the BOSE amplifier unit wiring harness-side connector (26-pin) terminal and the ground. For front speaker - Terminal B (26-pin, L+) - Ground - Terminal D (26-pin, L-) - Ground - Terminal W (26-pin, R+) - Ground - Terminal Y (26-pin, R-) - Ground For rear speaker - Terminal C (26-pin, L+) - Ground - Terminal A (26-pin, L-) - Ground - Terminal X (26-pin, R+) - Ground - Terminal Z (26-pin, R-) - Ground - Is there the continuity? | Yes | Repair or replace the short circuit between the BOSE amplifier unit and speaker harness or inside the speaker unit. Note • If there is a short circuit between the speaker harness or speaker lead wire and ground, the protector circuit inside the BOSE amplifier unit operates to cut the sound.
No | Go to the next step.
8 | • Remove the suspect speaker. • Disconnect the speaker connector (2-pin) and inspect the resistance of speaker. • Is the resistance normal? Specification • Speaker resistance + wiring harness resistance | Yes | Replace the BOSE amplifier unit.
No | Go to the next step.
9 | • Inspect the suspect speaker. • Is the speaker normal? Note • If the speaker lead wire contacts to either ground or vehicle frame, replace the speaker. | Yes | Replace the BOSE amplifier unit.
No | Go to the next step.