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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the cellular microphone.
  2. Test for less than 10 Ω between the drain circuit terminal 4 and ground.
    • If greater than the specified range, test the circuit for an open/high resistance.
  3. Ignition ON, test for 9.5-10.5 V between the signal circuit terminal 1 and ground.
    • If less than the specified range, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the CIM.
    • If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the CIM.
  4. If all circuits test normal, replace the cellular microphone.
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