Did you perform the DRL System Check?

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Go to Step 2

Go to Daytime Running Lights (DRL) System Check

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 3

1. Set the park brake.
2. Using the scan tool, read the park brake switch status.

Does the scan tool show SET?

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Go to Step 4

Go to Step 6

Using the scan tool, command the daytime running lamps (DRL) relay OFF.

Do the DRL lights turn off?

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Go to Step 5

Go to Daytime Running Lamps (DRL) Headlamps Always On

Replace the BCM. Refer to Body Control Module Replacement in Body Control Systems.

Is the repair complete?

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System OK

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1. Disconnect the park brake switch.
2. Connect a jumper wire from terminal A to ground.
3. Using the scan tool, read the park brake switch status.

Does the scan tool show SET?

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Go to Step 7

Go to Step 8

Replace the park brake switch. Refer to Parking Brake Indicator Switch Replacement in Park Brake.

Is the repair complete?

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System OK

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Locate and repair the open in CKT 1134 (LT BLU) between the BCM and the switch.

If no open is found, replace the BCM. Refer to Body Control Module Replacement in Body Controls.

Is the repair complete?

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System OK

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