Since GM doesn't sell the parts or the repair info to the public (no car maker does) you will need to remove the unit from the car and have it repaired by a local GM electronics repair shop, your local dealer can provide name and phone number, some will also assist removing the unit for a small fee.
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I just disconnected the battery cables and waited for about 10 minutes and reconnected the cables and the error was gone and the cd changer worked again.
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