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Circuit/System Testing

IMPORTANT:

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 volts between the coax cable connection center conductor at the radio and ground.
    • If not within the specified range, replace the radio.
  3. If all circuits test normal, connect the EL-49903  GM Antenna Diagnostic Tool Kit to the vehicle radio, place the test antenna on the roof of the vehicle, and check for GPS reception.
    • If GPS reception does not return with the test antenna, replace the GPS antenna.
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