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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, Without Navigation.

1. CONNECTOR CHECK

Check the AV control unit, BOSE speaker amp. and subwoofer connectors for the following:
- Proper connection
- Damage
- Disconnected or loose terminals
Is the inspection result normal?
YES- GO TO 2.
NO- Repair the terminal and connector.

2. VERIFY SUBWOOFER POWER AND GROUND SUPPLY

Check power and ground supply to the subwoofer. Without Navigation
Did the power and ground supply check OK?
YES- GO TO 3
NO- Repair harness or connector.

3. HARNESS CHECK






1.Disconnect BOSE speaker amp. connectors and subwoofer connector.
2.Check continuity between BOSE speaker amp. harness connectors B74 (A) and B75 (B) and subwoofer harness connector B72
(C).





3.Check continuity between BOSE speaker amp. harness connector B74 (A) and B75 (B) and ground.





Are the continuity results as specified?
YES- GO TO 4
NO- Repair harness or connector.

4. SUBWOOFER AMP ON SIGNAL CHECK






1.Connect BOSE speaker amp. connector B74.
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 5
NO- Replace BOSE speaker amp. Without Navigation.

5. SUBWOOFER AUDIO SIGNAL CHECK

1.Connect BOSE speaker amp. connectors and subwoofer connector.
2.Turn ignition switch to ACC.
3.Push "POWER" switch.





4.Check the signal between BOSE speaker amp. harness connector B74 terminals with CONSULT or oscilloscope.





Is the audio signal voltage as specified?
YES- Replace subwoofer. Without Navigation.
NO- GO TO 6

6. HARNESS CHECK

1.Turn ignition switch OFF.





2.Disconnect AV control unit connector M69 and BOSE speaker amp. connector B75.
3.Check continuity between AV control unit harness connector
M69 (A) and BOSE speaker amp. harness connector B75 (B).





4.Check continuity between AV control unit harness connector
M69 (A) and ground.





Are the continuity results as specified?
YES- GO TO 7
NO- Repair harness or connector.

7. BACK DOOR SPEAKER SIGNAL CHECK






1.Connect AV control unit connector M69 and BOSE speaker amp. connector B75.
2.Turn ignition switch to ACC.
3.Push "POWER" switch.
4.Check the signal between AV control unit harness connector
M69 terminals with CONSULT or oscilloscope.





Is the audio signal voltage reading as specified?
YES- Replace BOSE speaker amp. Without Navigation.
NO- Replace AV control unit. Without Navigation.