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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the cellular microphone.
  2. Ignition ON, test for 8.5-9.5 volts between the cellular microphone signal circuit terminal B and ground.
    • If less than specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
    • If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
  3. Ignition OFF, test for less than 10 ohms between the cellular microphone low reference circuit terminal A and ground.
    • If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the radio.
  4. Ignition OFF, disconnect the X1 harness connector at the radio.
  5. Verify that a test lamp does not illuminate between B+ and the low reference circuit terminal A.
    • If the test lamp illuminates, test the low reference circuit for a short to ground.
  6. If all circuits test normal, replace the cellular microphone.
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