WARNING: This page is about a different car, the 2009 Saturn Outlook, 2009 GMC Acadia, 2009 Chevrolet Traverse, and 2009 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
Cellular Microphone Signal
B2455 04
B2455 04
B2455 04
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Cellular Microphone Low Reference
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B2455 04
1
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1. OnStar Microphone Inoperative - Caller Cannot Be Heard