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I just bought a '94 vette and I really have no need to use the cassette player lol. I heard that the stock radio is part of the security system and you can't take it out. How can you put in a new headunit?
That is not true. The C4 Audio FAQ has the instructions on how to by pass a potential SYS error. What is does do is cause the aformentioned SYS error - cause the CCM is polling to find the radio, so the SVC function will work.