Suddenly went dead - head unit seems to display fine - will change cd's, channels etc. But button push only elicits a "buzz" sound. Fiddling with fader switch does nothing.

Is not the tuner actually in the right side wall of the trunk? Is this the likely culprit? Any tricks like fuse etc?

Any help appreciated.

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1992 Black 500e
1991 Black 300te 4m
1992 Black Renntech 620sl
1979 Porsche 911sc targa