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

Connector End View Reference: Master Electrical Component List in Wiring Systems

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

Do the high beam headlamps operate properly?

Go to Step 4

Go to Headlamps Inoperative - High Beams or Headlamp Low or High Beams Always On

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. Turn On the headlamps.
4. With the scan tool, command the Daytime Running Lamps ON and OFF from the dash integration module (DIM) Output Control data list.

Did the DRL headlamps turn ON and OFF with each command?

Go to Step 11

Go to Step 5

1. Turn OFF the ignition.
2. Disconnect the DRL relay. Refer to Relay Replacement in Wiring Systems.
3. Connect a test lamp between the DRL relay control side supply voltage circuit and a good ground.
4. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 6

Go to Step 13

Connect a test lamp between the DRL relay switch side supply voltage circuit and a good ground.

Does the test lamp illuminate?

Go to Step 7

Go to Step 14

1. Turn OFF the ignition.
2. Connect a test lamp between the DRL relay control side supply voltage circuit and the DRL relay control circuit.
3. Turn ON the ignition, with the engine OFF.
4. With a scan tool, command the Daytime Running Lamps ON and OFF.

Does the test lamp turn ON and OFF with each command?

Go to Step 9

Go to Step 8

Test for an open circuit or a short to voltage in the DRL relay control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 17

Go to Step 11

Test for an open or a short to ground in the left headlamp high beam/DRL control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 17

Go to Step 10

Inspect for poor connections at the DRL 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 17

Go to Step 15

Inspect for poor connections at the dash integration module (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 17

Go to Step 12

1. Perform the setup procedure for the DIM. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.
2. Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 16

Repair open circuit in the DRL relay control side supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 17

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Repair open circuit in the DRL relay switch side supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 17

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

Did you complete the replacement?

Go to Step 17

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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 17

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2