PCM2/CDR23 - External BOSE Amplifier

800A External BOSE Amplifier

Microphone signal faulty

Diagnostic conditions
- Ignition on
- PCM2/CDR23 on

NOTE:
- Fault code 8003 is recorded in the PCM2 MMI if the operating buttons are actuated for '≥1 Min.'
- 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
- No signal is emitted from the microphone

Affected pin
Amplifier control module, plug B, pins 1 and 10

Diagnosis/troubleshooting