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The rotary volume knob on my DEH 9400MP head unit has stopped working. this also happened to my friend's. the steering wheel remote still works. is this common? can it be fixed please?

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Although I can't check this fix works for 1 month, a really simple explanation and fix was offered.

The rotary knob/control has 2 contacts, which when the knob is rotated c/w or anti-c/w it generates a pulse. The diagnosis is that as the remote still works, the PCB & volume circuit is fine. What is likely is that the 2 contacts/switches have become dirty or clogged.

SUGGESTED FIX: Take head unit faceplate apart to access PCB & rear of rotary control (4 screws). Spray WD40 into rear of volume control and rotate liberally to clean contacts. Dry of with lint free cloth, tissue or air dry.

I am confident this will work and the volume control will function again.

Posted on Sep 28, 2008

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