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Home >> Cadillac >> 2009 >> Escalade EXT >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Infotainment >> Cellular System, Entertainment System & Navigation System >> Diagnostic Information and Procedures >> No Global Positioning System (GPS) Reception >> Circuit/System Testing

Circuit/System Testing

NOTE: The global positioning system (GPS) requires a clear line of sight to the sky to operate properly. In most cases the GPS will not have reception near tall buildings or inside structures.
  1. Ignition OFF, disconnect the GPS antenna coax cable from the navigation radio.
  2. Ignition ON, test for 4.5-5.5 V between the coax cable center conductor terminal at the radio and ground.
    • If not within the specified range, replace the radio.
  3. If all circuits test normal, replace the GPS antenna.
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