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Home >> Cadillac >> 2011 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 987 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> OnStar Global Positioning System (GPS) Data Not Current or Inaccurate >> Circuit/System Verification
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Circuit/System Verification

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Observe the scan tool GPS Signal Status Indicator parameter for at least 10 seconds. Verify the indicator displays Yes.
    • If the indicator does not display Yes, refer to Circuit / System Testing.
  2. Call and verify the OnStar advisor receive GPS data.
    • If the advisor did not receive GPS data and the call was a 'fail to voice', contact the GM Technical Assistance Center.
    • If the advisor did not receive GPS data and the call was not a 'fail to voice', refer to Circuit / System Testing.
  3. Verify with the OnStar Call Center advisor that your actual position is within a reasonable distance from the actual location of the vehicle.
    • If your actual position is not within a reasonable distance from the actual location of the vehicle, replace the VCIM.
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