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Home >> GMC >> 2017 >> Acadia SL >> Repair and Diagnosis >> External Pages >> Different car >> Section 189 (Cellular System, Entertainment System, And Navigation System - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> OnStar Microphone Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

It is necessary to have the vehicle in a quiet, open outside area where a cellular call can be successfully placed and GPS data can be received from satellites.

  1. Ignition ON/vehicle in Service Mode.
  2. Verify that DTC B2455 is not set.
    • If DTC B2455 is not set 
  3. Verify that your voice is heard clearly by the OnStar Call Center after completing a blue button press.
    • If your voice can not be heard clearly 

      Refer to Circuit/System Testing - Microphone Malfunction.

    • If your voice can be heard clearly 
  4. Verify that a successful OnStar voice command when completing a blue button press.
    • If your voice can not be heard clearly 

      Refer to Circuit/System Testing - Cellular Telephone Voice Malfunction.

    • If your voice can be heard clearly 
  5. All OK.