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

Connector End View Reference: Master Electrical Component List

1

Did you perform the Lighting System Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

Important:: Vehicle shift lever must be out of the PARK position in order for the daytime running lamps (DRL) to operate.

1. Turn ON the ignition, with the engine OFF.
2. Turn OFF the wipers.
3. Place the headlight switch to the AUTO position.
4. Depress and hold the brake pedal.
5. Move the gear selector out of park position.
6. Verify the parking brake is disengaged.
7. Expose the sunload sensor assembly to a bright light.
8. Wait more than 20 seconds.
9. Observe the DRL lamps.
10. Cover the sunload sensor assembly.
11. Wait more than 20 seconds.
12. Observe the DRL lamps.
13. Place the gear selector in the park position.
14. Release the brake pedal.

Did the DRL operate properly?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

1. Turn OFF the ignition.
2. Install a scan tool.
3. Turn ON the ignition, with the engine OFF.
4. Verify the shift lever is in the PARK position.
5. With a scan tool, observe the DRL relay status in the dash integration module (DIM) Outputs data list.

Does the scan tool display OFF status?

Go to Step 4

Go to Step 6

1. Turn OFF the ignition.
2. Disconnect the DRL relay. Refer to Relay Replacement in Wiring Systems.
3. Turn ON the ignition, with engine OFF.

Did the DRL turn OFF?

Go to Step 5

Go to Step 10

Connect a test lamp between the DRL relay control circuit of the DRL relay and the control side supply voltage circuit of the DRL relay.

Does the test lamp illuminate?

Go to Step 6

Go to Step 9

Test the DRL relay control circuit of the DRL headlamp relay for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

Go to Step 7

Test the Twilight Sentinel Delay Signal circuit of the DIM for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

Go to Step 8

Inspect for poor connections at the DIM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

Go to Step 11

Inspect for poor connections at the DRL headlamp relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

Go to Step 12

Repair the short to voltage in the left headlamp high beam/DRL control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 13

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Important:: Perform the setup procedure for the DIM after DIM replacement.

Replace the DIM. Refer to Dash Integration Module Replacement in Body Control System.

Did you complete the replacement?

Go to Step 13

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Replace the DRL headlamp relay. Refer to Relay Replacement in Wiring Systems.

Did you complete the replacement?

Go to Step 13

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2