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I have had similar problems with the CDR-23 installed in my ’03. Usually on a hot day it goes to “protect” mode and I can’t do anything. Once or twice it has done the mute thing as you described. Once I get home, let it cool down and reset the alarm, it works fine. It also works if I remove the radio (the CDR-23 doesn’t have a face plate) unplug everything and plug it back up.
It seems to only be a warm weather issue for me. In the winter, it works fine. I make sure that whenever I park in the sun to put the sun screen in the windshield. This has helped reduce the number of times it flakes out.
I did talk to the dealer about it because my car is still under the CPO warranty. They wouldn’t diagnose it because I have a Sirius unit in the car and the computer had some kind of “unauthorized device” error code. I find it hard to believe that the FM signal that the Sirius unit broadcasts is at fault.
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