hmmm, I don't know much about the CDR210, but my thinking is merely troubleshooting not really based on any particular head unit. I still think its either a cold solder point or a bad connector on one of your connectors. Its not really going to be that easy to figure out which nor will it be that inexpensive to find.
I just can't really figure out how the windshield wiper interacts with the radio other than the same power source. If its a bad power source, then you would hear it everywhere. Not just one door speaker.
Sorry that I'm not more help.
JBG
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"Insanity: doing the same thing over and over again and expecting different results." -- Albert Einstein
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