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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the rear seat audio control switch.
  2. Ignition ON, test for B+ between the voltage reference circuit terminal 4 and ground.
    • If less than the specified value, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  3. Test for B+ between the voltage reference circuit terminal 4 and the signal circuit terminal 1.
    • If less than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. Ignition OFF, disconnect the X1 harness connector at the BCM.
  5. Test for infinite resistance between the signal circuit terminal 1 and ground.
    • If less than the specified value, test the signal circuit for a short to ground.
  6. If all circuits test normal, test or replace the rear seat audio control switch.
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