Test J: DTC B2633 Driver - Front Microphone Circuit Failure

PINPOINT TEST J: DTC B2633 DRIVER - FRONT MICROPHONE CIRCUIT FAILURE

J1-J2:

J2-J4:

J4-J6:

Normal Operation
The navigation system microphone is integrated into the rear view mirror. The microphone supplies a voice signal to the navigation system module through circuits 8-MC8 (WH/RD) and 9-MC8 (BN/RD). The rear view mirror receives switched B+ voltage through circuit 75-AD15 (YE/BU). Circuit 31-AD15 (BK) provides the mirror ground.

Possible Causes
- circuit 8-MC8 (WH/RD) open, short to ground or short to voltage
- circuit 9-MC8 (BN/RD) open, short to ground or short to voltage
- circuit 31-AD15 (BK) open
- microphone
- navigation system module