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

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

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

Do the low beam headlamps operate properly?

Go to Step 4

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

1. Turn OFF the ignition.
2. Disconnect the DRL relay in the top underhood junction block.
3. Connect a test lamp between the DRL relay coil supply voltage and ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 12

1. Using a test lamp at the DRL relay connector, probe between the DRL relay coil supply voltage circuit and the DRL relay control circuit.
2. Turn ON the ignition, with the engine OFF.
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.

Does the test lamp illuminate?

Go to Step 6

Go to Step 8

Test for an open or a poor connector in the ground circuit of the DRL relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 14

Go to Step 7

Test for an open or a poor connection in the switched ground circuit of the DRL relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 14

Go to Step 10

Test for an open or a short to battery positive 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 14

Go to Step 9

Inspect for poor connections at the harness connector of the body control module (BCM). 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 14

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 14

Go to Step 13

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

Did you find and correct the condition?

Go to Step 14

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Repair a poor connection or an open in the DRL relay coil supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 14

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

Did you complete the replacement?

Go to Step 14

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2