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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the B16 backup lamp switch.
  2. Ignition OFF, exterior lamps OFF, doors CLOSED, wait 30 seconds, test for less than 5 Ω between the ground circuit terminal 2 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Reverse Position Switch parameter is OFF.
    • If not the specified value, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the K20 engine control module.
  4. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the ground circuit terminal 2. Verify the scan tool Reverse Position Switch parameter is ON.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 engine control module.
  5. If all circuits test normal, replace the B16 backup lamp switch.
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