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Home >> Cadillac >> 2009 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 244 (Cellular Systems, Entertainment Systems & Navigation Systems) >> Diagnostic Information and Procedures >> OnStar Global Positioning System (GPS) Data Not Current or Inaccurate >> Circuit/System Testing
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Circuit/System Testing

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  1. Disconnect the navigation antenna coax cable from the CIM.
  2. Ignition ON, test for 4.5-5.5 V between the CIM coax cable center conductor terminal at the module and ground.
    • If 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 V between the coax cable center conductor and the outer shield.
    • If not within the specified range, replace the coax cable.
  5. If all circuits test normal, replace the navigation antenna.
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