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Bad radio reception on FM when electrically heated rear window is on (even noise level) (4D)

Symptom: Poor radio reception on FM when the electrically heated rear window is on. Uniform noise level.

Bad radio reception on FM when electrically heated rear window is on (even noise level) (4D)


Fault symptoms

Poor radio reception on FM when the electrically heated rear window is on.

Uniform noise level.

Probable cause of fault

There is a break in one of the wires in the demister matrix/antennas.

Tips for fault diagnosis

Check the electrically heated rear window visually as follows:

darken the rear window by covering it with, for instance, a blanket. Switch the electrically heated rear window on and look for sparks on the window.

Diagnostic procedure

If a fault is found, repair the rear window with contact paint.

Replace the rear window if necessary.