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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 120 (Cellular System, Entertainment System, And Navigation System - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC B1277: Microphone 1 (with IO6 and CW1) >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2016 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

The Navigation Control Module uses the cellular telephone microphone for voice recognition. The Navigation Control Module provides a bias voltage to each microphone (+) and (-) signal circuits for operation of the microphone.

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