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Im trying to help a friend with a C5Z. We installed and iPOD adapter over the winter. During this time he changed cylinder heads and the battery was out for 2 months. Car started and everything worked perfect, including the ipod adapter.
He got a tune got the car back and now the radio has the security light on constant as red and nothing on the radio works. The tuner told him it was like that when the car was received.
What is going on and what can be done to fix the problem?