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

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

DEFINITION: Low beam headlamps are ON at all times, all other exterior lamps are OFF.

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

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. Verify the wipers are in the OFF position.
3. Position the headlight switch in the OFF position.
4. Depress and hold the brake pedal.
5. Move the gear selector out of park position.
6. Expose the sunload sensor assembly to a bright light.
7. Wait more than 20 seconds.
8. Observe the DRL lamps.
9. Cover the sunload sensor assembly.
10. Wait more than 20 seconds.
11. Position the gear selector in the park position.
12. Release the brake pedal.
13. Turn OFF the ignition.

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 Daytime Running Lamp 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 the engine OFF.

Did the DRL turn OFF?

Go to Step 5

Go to Step 10

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

Does the test lamp illuminate?

Go to Step 6

Go to Step 9

Test the DRL relay control circuit of the DRL 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 battery positive 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 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 battery positive voltage in the DRL supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 13

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Replace the DIM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

Go to Step 13

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Replace the DRL 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