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Circuit/System Testing

  1. Ignition OFF, disconnect the navigation antenna coax cable from the A11 radio.
  2. Ignition ON, test for 4.5-5.5 V between the coax cable connection center conductor at the radio and ground.
    • If not within the specified range, replace the radio.
  3. Ignition OFF, reconnect the navigation antenna coax cable at the A11 radio.
  4. Disconnect the antenna coax cable from the T4M navigation antenna.
  5. Ignition ON, 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.
  6. If all circuits test normal, replace the T4M navigation antenna.
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