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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the key in ignition switch.
  2. Ignition ON, test for 4.8-5.2 V between the 5V reference circuit terminal 6 and ground.
    • If less than the specified range, test the 5V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
    • If greater than the specified range, test the 5V reference circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  3. Verify the BCM scan tool Key In Ignition Cylinder Switch parameter is No.
    • If not the specified value, test the signal circuit terminal 5 for a short to voltage. If the circuit tests normal, replace the BCM.
  4. Install a 3A fused jumper wire between the signal circuit terminal 5 and the 5V reference circuit terminal 6. Verify the scan tool Key In Ignition Cylinder Switch parameter displays Yes.
    • If not the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the ignition switch.
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