Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics

Did you review the Lighting System Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Lighting Systems

Verify that the daytime running lamps are on with the park brake applied.

Does the system operate normally?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

1. Disconnect the DRL control module connector
2. Test for high resistance between the DRL control module connector cavity 9 to chassis ground with the brake applied.

Is a high resistance condition present?

Go to Step 5

Go to Step 4

Replace the DRL control module. Refer to Daytime Running Lights (DRL) Control Module Replacement .

Is the replacement complete?

Go to Step 8

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1. Disconnect the parking brake switch connector.
2. Disconnect the DRL control module connector.
3. Test for an open between the DRL control module connector cavity 9 and the parking brake connector cavity.

Is an open condition present?

Go to Step 6

Go to Step 7

Locate and repair the open in the DRL relay control circuit between the brake switch connector and the DRL control module. Refer to Wiring Repairs .

Is the repair complete?

Go to Step 8

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Replace the parking brake switch. Refer to Parking Brake Indicator Switch Replacement .

Is the replacement complete?

Go to Step 8

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3