WARNING: This page is about a different car, the 2010 Saturn Outlook, 2010 GMC Acadia, 2010 Chevrolet Traverse, and 2010 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
Circuit
Short to Ground
Open/High Resistance
Short to Voltage
Signal Performance
Signal
B2455 04
B2455 04
B2455 04
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Low Reference
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B2455 04
1
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1. OnStar Microphone Inoperative - Caller Cannot Be Heard