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Home >> Hummer >> 2008 >> H3 Base, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 98 (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 is about a different car, the 2008 Chevrolet Malibu Classic. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: The vehicle may be equipped with sectioned coax cable. Test each section and replace only the faulty section, not the entire length or coax.
  1. Ignition OFF, disconnect the navigation antenna coaxial cable from the VCIM and the navigation antenna.
  2. Test for less than 5 ohms of resistance between the two ends of the coax cable center conductor.
    • If greater than the specified range, replace the antenna coax cable.
  3. Test for less than 5 ohms of resistance between the two ends of the coax cable outer shield.
    • If greater than the specified range, replace the antenna coax able.
  4. Test for infinite resistance between the antenna coax center conductor and the outer shield.
    • If less than the specified range, replace the antenna coax cable.
  5. If all circuits test normal, replace the navigation antenna.