I replaced my oem unit with a Clarion head unit so I could play CD's

I had to give up and take it to the delaer where I bought the head unit as I could figure out all the wires
They told me there was no harness available and had to splice the Clarion in.
To get the radio to work properly you have to run a wire back through the car to the rear aerial.

Jim

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92 300 TE 4matic