Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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Here are replacement instructions, the BCM will need to be reprogrammed with dealer scantool after installing. Let me know if you have more questions, thanks.
Only other thing to do would make sure the white wire that goes from Pin A11 of C2 at BCM to headlamp relay is good, if so I agree BCM needs to be replaced. Here is a wiring diagram to help with testing, let me know if you have more questions. Thanks.