WARNING: This page is about a different car, the 2017 GMC Acadia Limited, 2017 Chevrolet Traverse, and 2017 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 02
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