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Home >> Cadillac >> 2008 >> DTS 4.6 9 >> Repair and Diagnosis >> External Pages >> Different car >> Section 12 (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 2007 Cadillac DTS. 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. It is also necessary to inform the OnStar® Call Center advisor that this call is for vehicle diagnostic purposes.
  1. Disconnect the navigation antenna coax cable from the navigation antenna within the wiring harness.
  2. Disconnect the navigation antenna from the VCIM.
  3. Test for infinite resistance between the center conductor of the coax to the metal outer shield.
    • If it does not read infinite, replace the navigation antenna coax cable.
  4. Test for greater than 1 ohm resistance at the navigation antenna coax center conductor from end to end.
    • If less than specified value, replace the navigation antenna assembly.
    • If greater specified value, replace the navigation antenna coax cable.
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