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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the headlamp switch.
  2. Ignition OFF, test for less than 1 Ω of resistance between the ground circuit and ground.
    • If greater than 1 Ω, test the ground circuit for an open/high resistance.
  3. Verify the headlamps are OFF.
    • If the headlamps are not OFF, test the signal circuit for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3-amp fused jumper wire between the signal circuit and ground. Verify the headlamps are ON.
    • If the headlamps are not ON, test the signal circuit of the headlamp switch for a short to voltage or an open/high resistance. If circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the headlamp switch.
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