Schematic Reference: Exterior Lights Schematics

Connector End View Reference: Lighting Systems Connector End Views or Data Communication Connector End Views

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

Verify the fault is present.

1. Block the drive wheels.
2. Ensure the park brake is released.
3. Turn ON the Ignition with the engine OFF.
4. Place the headlamps in the OFF position.
5. With the brake pedal depressed, place the gear selector in D.

Does the system operate normally?

Go to Testing for Electrical Intermittents

Go to Step 3

Is only one daytime running lamp (DRL) inoperative?

Go to Step 4

Go to Step 5

Test the supply and ground circuits of the affected lamp for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs.

Did you find and correct the condition?

Go to Step 15

Go to Step 14

1. Ensure the park brake is not set.
2. Install a scan tool.
3. Turn ON the ignition, with the engine OFF.
4. With the scan tool, observe the Park Brake Switch parameter in the body control module (BCM) data list.

Does the scan tool display RELEASED?

Go to Step 7

Go to Step 6

Test the signal circuit of the park brake switch for a short to ground. Refer to Circuit Testing and Wiring Repairs.

Did you find and correct the condition?

Go to Step 15

Go to Step 9

Test the DRL low control circuit of the turn/hazard flasher module for a ground signal.

Is ground signal present?

Go to Step 10

Go to Step 8

Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs.

Did you find and correct the condition?

Go to Step 15

Go to Step 11

Inspect for poor connections at the harness connector of the park brake switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs.

Did you find and correct the condition?

Go to Step 15

Go to Step 12

Inspect for poor connections at the harness connector of the turn/hazard flasher module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs.

Did you find and correct the condition?

Go to Step 15

Go to Step 13

Replace the BCM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 15

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

Did you complete the replacement?

Go to Step 15

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Replace the turn/hazard flasher module. Refer to Hazard and Turn Signal Flasher Replacement .

Did you complete the replacement?

Go to Step 15

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Replace the inoperative DRL lamp.

Did you complete the replacement?

Go to Step 15

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3