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SUBWOOFER (COUPE)


Description

The audio unit sends audio signals to the BOSE speaker amp. The BOSE speaker amp. amplifies the audio signals before sending them to the subwoofers using the audio signal circuits.





SUBWOOFER (COUPE)


Diagnosis Procedure

Regarding Wiring Diagram information, refer to Without Navigation.
1.HARNESS CHECK





1. Disconnect BOSE speaker amp. connector B122 and suspect rear subwoofer connector.
2. Check continuity between BOSE speaker amp. harness connector B122 (A) and suspect rear subwoofer harness connector (B).





3. Check continuity between BOSE speaker amp. harness connector B122 (A) and ground.






Are the continuity test results as specified?
YES - GO TO 2
NO - Check connector housings for disconnected or loose terminals.
- Repair harness or connector.
2.REAR SUBWOOFER SIGNAL CHECK





1. Connect BOSE speaker amp. connector B122 and suspect rear subwoofer connector.
2. Turn ignition switch to ACC.
3. Push "POWER" switch.
4. Check the signal between BOSE speaker amp. harness connector B122 terminals with CONSULT-III or oscilloscope.





Is the audio signal voltage as specified?
YES - Replace suspect rear subwoofer. Refer to Without Navigation.
NO - GO TO 3
3.HARNESS CHECK
1. Disconnect audio unit connector M134 and BOSE speaker amp. connector B121.
2. Check continuity between audio unit harness connector M134 (A) and BOSE speaker amp. harness connector B121 (B).





3. Check continuity between audio unit harness connector M134 (A) and ground.





Are the continuity test results as specified?
YES - GO TO 4
NO - Check connector housings for disconnected or loose terminals.
- Repair harness or connector.
4.REAR SUBWOOFER SIGNAL CHECK
1. Connect audio unit connector M134 and BOSE speaker amp. connector B121.
2. Turn ignition switch to ACC.
3. Push "POWER" switch.
4. Check the signal between audio unit harness connector M134 terminals with CONSULT-III or oscilloscope.





Is the audio signal voltage reading as specified?
YES - Replace BOSE speaker amp. Refer to Without Navigation.
NO - Replace audio unit. Refer to Bose Audio.