Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
.sorry for the delay.............Greetings...... “Hi, I’m Don (akaCustomer and I look forward to helping you!”.IF you have changed the Factory AMP, then the issue can be the Radio, BCM or the Communication Module.The BCM powers on the AMP & the RadioThe Communication Module enables the Radio, AMP & BCM to communicate with each other.There is NO Customer Input for testing, other than checking connections & voltageUse of GM Dealer Scan Tool is needed to Update, Test & Program
apprx 1 hour laborCould be as simple as a Software Update
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