Subwoofer

SUBWOOFER





Description
The AV control unit sends audio signals to the BOSE speaker amp. The BOSE speaker amp. amplifies the audio signals before sending them to the subwoofer using the audio signal circuits.




Diagnosis Procedure
Regarding Wiring Diagram information, Bose Audio Without Navigation.
1.VERIFY SUBWOOFER POWER AND GROUND SUPPLY
Check power and ground supply to the subwoofer. Subwoofer Bose Audio Without Navigation.
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, M113 and subwoofer connector B72.
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 and M113.
2. Turn ignition switch to ACC.
3. Push "POWER" switch.
4. Check voltage between subwoofer connector B72 terminal 4 and ground.





Are the voltage readings as specified?
YES - GO TO 4.
NO - Replace BOSE speaker amp. Removal And Installation Bose Audio Without Navigation.
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. Removal And Installation Bose Audio Without Navigation.
NO - GO TO 5.
5.HARNESS CHECK
1. Turn ignition switch OFF.





2. Disconnect AV control unit connector M72 and BOSE speaker amp. connector M113.
3. Check continuity between AV control unit harness connector
M72 (A) and BOSE speaker amp. harness connector M113 (B).





4. Check continuity between AV control unit harness connector
M72 (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.SUBWOOFER SPEAKER SIGNAL CHECK
1. Connect AV control unit connector M72 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
M72 terminals with CONSULT-III or oscilloscope.










Is the audio signal voltage reading as specified?
YES - Replace BOSE speaker amp. Removal And Installation Bose Audio Without Navigation, "Removal and Installation".
NO - Replace AV control unit. Removal And Installation Bose Audio Without Navigation.