Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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Here is the wiring diagram for the 2007.
Here is the wiring diagram for the 2010.
2007 Onstar wiring
#2 Clear is drain wire for microphone
#10 is Microphone signal wire
Need to do some more checking on others
Can you send pictures of both connectors at wire end