Diagnosis Procedure

SUBWOOFER


Diagnosis Procedure

1.VERIFY SUBWOOFER POWER AND GROUND SUPPLY
Check power and ground supply to the subwoofer. Refer to Woofer
Did the power and ground supply check OK?
YES - GO TO 2.
NO - � Check connector housings for disconnected or loose terminals.
- Repair harness or connector.
2.HARNESS CHECK
1. Disconnect BOSE speaker amp. connector M112 and subwoofer connector.
2. Check continuity between BOSE speaker amp. harness connector M112 (A) and M113 (B) and subwoofer harness connector
B72 (C).










3. Check continuity between BOSE speaker amp. harness connector M112 (A) and M113 (B) and ground.





Are the continuity test results as specified?
YES - GO TO 3.
NO - � Check connector housings for disconnected or loose terminals.
- Repair harness or connector.
3.SUBWOOFER AMP ON SIGNAL CHECK





1. Connect BOSE speaker amp. connector M112.
2. Turn ignition switch to ACC.
3. Push "POWER" switch.
4. Check voltage between subwoofer connector B72 terminal 4 and ground.





Are the voltage test results as specified?
YES - GO TO 4.
NO - Replace BOSE speaker amp. Refer to Service and Repair.
4.SUBWOOFER AUDIO SIGNAL CHECK
1. Connect BOSE speaker amp. connector M112 and subwoofer connector B72.
2. Turn ignition switch to ACC.
3. Push "POWER" switch.





4. Check the signal between BOSE speaker amp. harness connector M112 terminals with CONSULT-III or oscilloscope.





Is the audio signal voltage as specified?
YES - Replace subwoofer. Refer to Subwoofer.
NO - GO TO 5.
5.HARNESS CHECK
1. Disconnect AV control unit connector M42 and BOSE speaker amp. connector M113.
2. Check continuity between AV control unit harness connector
M42 (A) and BOSE speaker amp. harness connector M113 (B).










3. Check continuity between AV control unit harness connector
M42 (A) and ground.





Are the continuity test results as specified?
YES - GO TO 6.
NO - � Check connector housings for disconnected or loose terminals.
- Repair harness or connector.
6.REAR DOOR SPEAKER SIGNAL CHECK
1. Connect AV control unit connector M42 and BOSE speaker amp. connector M113.
2. Turn ignition switch to ACC.
3. Push "POWER" switch.
4. Check the signal between AV control unit harness connector
M42 terminals with CONSULT-III or oscilloscope.










Is the audio signal voltage reading as specified?
YES - Replace BOSE speaker amp. Refer to Service and Repair.
NO - Replace AV control unit. Refer to Service and Repair.