Voltage is applied at all times to the high beam headlamp relay from battery voltage. When the dimmer switch or the flash to pass switch send a ground input to the body control module (BCM), the BCM sends a ground output to the high beam relay. The high beam relay is activated then the switch side of the relay closes and turns on the lights.

The ignition is ON. The headlamps must be commanded ON by either the BCM.

The BCM detects a short to voltage on the high beam headlamps relay control circuit while trying to apply a ground to the circuit.

The high beam headlamps are not illuminated.

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

Schematic Reference

Headlights/Daytime Running Lights (DRL) Schematics

Connector End View Reference

Lighting Systems Connector End Views

Electrical Information Reference

Scan Tool Reference

Ignition ON, turn the headlamps ON. Turn the high beams ON. The headlamps should illuminate.

1. Ignition OFF, disconnect the C2 high beam harness connector at the BEC.
2. Connect a test lamp between the control circuit C2 terminal 8 and B+.
3. Command the high beams 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 high beams harness connector at the BEC. Disconnect the harness connector C3 at both high beams.
5. Test for less than 1.0 ohm of resistance between the appropriate high beam ground circuit terminal 2 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 3 and ground.
7. Command the high beams 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 bulb assembly.

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.