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Home >> GMC >> 2007 >> Acadia SLT, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 601 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> OnStar Microphone Inoperative - Caller Cannot Be Heard >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Saturn Outlook, 2008 GMC Acadia, and 2008 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the cellular microphone.
  2. Ignition ON, test for greater than 9 volts between the signal circuit terminal B and ground.
    • If less than specified value, test the cellular microphone signal circuit for a short to ground, open/high resistance. If the circuit tests normal, replace the VCIM.
  3. Test for greater than 9 volts between the cellular microphone signal circuit terminal B and the drain circuit terminal A.
    • If less than specified value, repair open/high resistance or replace the VCIM.
  4. If all circuit test normal, replace the cellular microphone assembly.
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