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1990 500SL & 2002 C230 K Coupe & 2012 C250 Sedan
25 Posts

Have you tried grounding the rca's? Some pioneer decks have had this problem but I thought the z3 would have resolved it.

Just wrap a wire around the rca's and bolt it to the head unit and make sure the hu itself is grounded well enough.

Just went through this on my 09 g8gt and the processor I was using was bad...
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