Checking the Head Unit/Audio Unit Display

Checking the head unit / audio unit display

Fault-tracing information
Check the function of the rheostat on the hazard warning flasher button by increasing and lowering the instrument lighting.

Hint: If the rheostat is not working in the hazard warning flasher button, the fault is in the head unit / audio module.

Is the rheostat for the flash warning button working?

Yes - Replacing the component

No - No Fault Found

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Replacing the component
Try a new head unit / audio module.

Caution! New head unit / audio control modules are supplied without software. The head unit / audio control module must be programmed after it has been replaced.

Other information:
- For information about programming and accessing or replacing the main unit and/or audio control module, see Radio/telephone, changing Service and Repair.

Was a fault detected?

Yes - Fault Found

No - No Fault Found

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