1. Turn the ignition OFF.
2. Connect a scan tool.
3. Turn the ignition to the ON position.
4. Using the scan tool, check for any DTCs in the body control module (BCM).

Does the scan tool show any DTCs?

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Go to Diagnostic System Check - Body Control System in Body Control System

Go to Step 2

1. Turn the headlamp switch to the ON position.
2. Disconnect the headlamp dimmer switch connector C201C.
3. Connect a fused jumper wire from terminal E11 (PPL wire) of connector C201C to ground.

Do the High beams light?

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Go to Step 3

Go to Step 4

Replace the headlamp dimmer switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle in Steering Wheel and Column - Tilt.

Is the repair complete?

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System OK

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Locate and repair the open in CKT 524 (PPL) between underhood bussed electrical center (UBEC) and dimmer switch.

Is the repair complete?

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System OK

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