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Home >> Cadillac >> 2012 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1095 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Unable to Contact OnStar Call Center >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
  • It is important to have the vehicle in an open outside area where a cellular call can be successfully placed and GPS data can be received from satellites.
  • Placing an emergency call to the OnStar® Call Center should only be made if the diagnosis of the system leads to step 4. Immediately after an OnStar® advisor picks up the call, they should be told that this call is for diagnostic purposes only and there is no emergency.
  1. Press the OnStar® Call Center button. Verify a connection is not made with the OnStar® Call Center.
    • If a connection is made with the OnStar® Call Center, go to Diagnostic Aids .
  2. Listen for other tones or cellular messages rather than the normal progression tones or the Unable to Contact OnStar® prompt.
    • If no other tones or cellular messages are heard other than the normal progression tones or the Unable to Contact OnStar® prompt, go to Component Testing .
  3. Record all messages heard from the OnStar® Call Center button press.
  4. Press the OnStar® emergency button. Verify a connection to the OnStar® Call Center is made within 10 minutes.
  5. Hear all messages during the course of the tests available, and contact the General Motors Technical Assistance Center.
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