800A External BOSE Amplifier

800A BOSE External Amplifier

Microphone Signal Faulty

Diagnostic conditions
- Ignition on
- PCM2/CDR23 on

NOTE:
- The fault memory status (present/not present) is always updated when the motor is running.
- Fault code 8003 is recorded in the PCM2 MMI if the operating buttons are actuated for longer than '≥ 1 minute'.
- Deactivate the 'automatic traffic announcement' before performing the diagnosis on the PCM2. If this is not done, the diagnosis will abort.

Possible cause of fault
- The microphone gives off no signal

Affected pin
Control module amplifier plug B, pin 1 and pin 10

Diagnosis/Troubleshooting

Work Instruction 1 - 3:

Work Instruction 4 - 9: