Voltage is applied at all times to the Park Lamp Relay from battery voltage. When the headlamp switch is placed in the PARK position, ground is applied through the park lamp switch signal circuit to the body control module (BCM) . The BCM then applies a ground to the park lamp relay control circuit. This engages the relay and applies voltage through the park lamp fuses and to all the park lamps.

The ignition is ON. The park lamps must be commanded on by the headlamp switch.

The BCM detect a short to voltage on the park lamp relay control circuit while trying to apply a ground to the circuit.

All park lamps are inoperative.

The BCM clears this code from current when the fault is removed from the system.

Schematic Reference

Exterior Lights Schematics

Connector End View Reference

Lighting Systems Connector End Views

Electrical Information Reference

Scan Tool Reference

Ignition ON, turn the park lamps on. The park lamps should illuminate.

1. Ignition OFF, disconnect the C2 DRL harness connector at the BEC.
2. Connect a test lamp between the control circuit C2 terminal 8 and B+.
3. Command the DRL ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

⇒	If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.

⇒	If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.

4. Ignition OFF, connect the C2 DRL harness connector at the BEC. Disconnect the harness connector at the inoperative low beam head lamps.
5. Test for less than 1.0 ohm of resistance between the appropriate head lamp ground circuit terminal 3 and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

6. Connect a test lamp between the control circuit terminal 2 and ground.
7. Command the DRL ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.

⇒	If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BEC.

⇒	If the test lamp is always OFF and the circuit fuse is good, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the BEC.

⇒	If the test lamp is always OFF and the circuit fuse is open, test the control circuit for a short to ground. If the circuit tests normal, replace the appropriate head lamp.

8. If all circuits test normal, replace the appropriate head lamp.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.