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Home >> Hummer >> 2009 >> H3 Alpha >> Repair and Diagnosis >> External Pages >> Different car >> Section 110 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> OnStar Global Positioning System (GPS) Data Not Current or Inaccurate >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the navigation antenna coax cable from the CIM.
  2. Ignition ON, test for 4.5-5.5 volts between the CIM coax cable connection center conductor and ground.
    • If the reading is not within the specified range, replace the CIM.
  3. Reconnect the coax cable to the CIM. Disconnect the coax cable from the navigation antenna.
  4. Test for 4.5-5.5 volts between the coax cable center conductor and the outer shield.
    • If the reading is not within the specified range, replace the coax cable.
  5. If all circuits test normal, replace the navigation antenna.
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