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Circuit/System Testing

  1. Ignition OFF. Disconnect the harness connector at the cellular microphone.
  2. Ignition ON, test for 9 - 11 volts at signal circuit terminal B.
    • If greater than specified value, repair short to B+ or replace the VCIM.
    • If less than specified value, repair short to ground or open/high resistance or replace the VCIM.
  3. Disconnect the VCIM C2 harness connector.
  4. Test for less than 1 volt at the cellular microphone terminal A.
    • If greater than specified value, repair short to B+.
  5. Test for greater than 1 ohm of resistance between terminal A and ground.
    • If less than specified value, repair short to ground.
  6. Test for less than 1 ohm of resistance between terminal A and terminal 10.
    • If greater than the specified value, repair open/high resistance.
  7. If all circuits test normal, test or replace the cellular microphone.
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