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Circuit/System Testing

  1. Ignition OFF, disconnect the coax harness connectors at the navigation radio and the GPS antenna.
  2. Test for less than 5 ohms between the two ends of the coax cable center conductor.
    • If greater than the specified range, replace the GPS antenna coax cable.
  3. Test for less than 5 ohms between the two ends of the coax cable outer shield.
    • If greater than the specified range, replace the GPS antenna coax cable.
  4. Test for infinite resistance between the coax center conductor and the outer shield.
    • If less than the specified range, replace the GPS antenna coax cable.
  5. Connect the coax harness connector at the navigation radio.
  6. Ignition ON, test for 4.0-5.5 volts between the coax center conductor and the outer shield.
    • If not within the specified range, replace the navigation radio.
  7. If all circuits test normal, replace the GPS antenna.
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