Circuit/System Testing

Parklamp Switch Circuit Testing 

1. Ignition OFF, disconnect the harness connector at the headlamp switch.
2. Verify that the park lamps are OFF
   • If not OFF, test the signal circuit for a short to ground. If the circuit tests normal, replace the BCM.
3. Install a 3-amp fused jumper wire between the signal circuit and ground. Verify that the park lamps are ON.
   • If 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.
4. If all circuits test normal, test or replace the headlamp switch.