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

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

DEFINITION: This table is for vehicles equipped with park lamp daytime running lamps.

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

1. Turn ON the ignition, with the engine OFF.
2. Verify that the headlamp switch is in the OFF position.
3. Verify that the fog lamp switch is in the OFF position.
4. Verify that the hazard switch is in the OFF position.
5. Verify that the windshield wipers is in the OFF position.
6. Expose the ambient light sensor to a bright light.
7. Press and hold the brake pedal.
8. Move the gear selector out of the PARK position on vehicles equipped with automatic transmissions or release the parking brake on vehicles equipped with manual transmissions.
9. Wait more than 3 seconds.

Do the daytime running lights (DRL) headlamps operate properly?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

Do the hazard flashers operate properly?

Go to Step 4

Go to Hazard Lamps Inoperative

Does the vehicle have a manual transmission?

Go to Step 5

Go to Step 6

With a scan tool, observe the parking brake input parameter in the instrument panel cluster (IPC) data list.

Does the scan tool display an OFF status?

Go to Step 6

Go to Diagnostic System Check - Vehicle

With a scan tool, observe the Daytime Running Lamp parameter in the dash integration module (DIM) Outputs data list.

Does the scan tool display ON?

Go to Step 7

Go to Step 10

1. Turn OFF the ignition.
2. Connect a test lamp between the DRL relay control circuit at the turn signal/hazard/flasher module and battery positive voltage.
3. With a scan tool command the Daytime Running Lamps ON and OFF several times from the DIM output control data list.

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

Go to Step 9

Go to Step 8

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

Did you find and correct the condition?

Go to Step 13

Go to Step 10

Inspect for poor connections at the harness connector of the turn signal/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 13

Go to Step 11

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

Did you find and correct the condition?

Go to Step 13

Go to Step 12

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

Did you complete the replacement?

Go to Step 13

--

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

Did you complete the replacement?

Go to Step 13

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2

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

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

DEFINITION: This table is for export vehicles that utilize the low beam headlamps and park lamps as daytime running lamps (DRL).

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

1. Turn ON the ignition, with the engine OFF.
2. Press and hold the brake pedal.
3. Move the gear selector out of the PARK position on vehicles with automatic transmissions or release the parking brake on vehicles with manual transmissions.
4. Verify that the headlamp switch is in the OFF position.
5. Expose the ambient light sensor to a bright light.
6. Wait more than 3 seconds.

Do the DRL headlamps operate properly?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

1. With a scan tool, select the Daytime Running Lamp parameter from the Special Functions Output Controls data list.
2. Command the Daytime Running Lamp output control ON and OFF.

Do the DRL turn ON and OFF with each command?

Go to Step 5

Go to Step 4

Do the low beam headlamps function properly?

Go to Step 7

Go to Headlamps Inoperative - Low Beams

Is the vehicle equipped with a manual transmission?

Go to Step 6

Go to Step 12

With a scan tool, observe the Park Brake Switch parameter in the instrument panel cluster (IPC) Inputs data list.

Does the scan tool display an OFF status?

Go to Step 12

Go to Diagnostic System Check - Vehicle

1. Turn OFF the ignition.
2. Disconnect the DRL relay.
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 8

Go to Step 15

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 9

Go to Step 16

1. Connect a test lamp between the DRL relay control side supply voltage circuit and the DRL relay control circuit at the DRL relay connector.
2. 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 10

Go to Step 11

1. Turn OFF the ignition.
2. Connect a 10-amp fused jumper between the DRL relay switch side supply voltage circuit and the DRL headlamp supply voltage circuit.
3. Turn ON the ignition, with the engine OFF.

Do the DRL headlamps illuminate?

Go to Step 13

Go to Step 17

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

Did you find and correct the condition?

Go to Step 20

Go to Step 14

With a scan tool, observe the Photocell status in the climate control panel (CCP) Inputs data list.

Does the scan tool display a Light status?

Go to Step 14

Go to Twilight Sentinel Inoperative

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

Did you find and correct the condition?

Go to Step 20

Go to Step 18

Inspect for poor connections at the dash integration module (DIM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs.

Did you find and correct the condition?

Go to Step 20

Go to Step 19

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

Did you complete the repair?

Go to Step 20

--

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

Did you complete the repair?

Go to Step 20

--

Repair the open in the DRL headlamp supply voltage circuit. Refer to Circuit Testing and Wiring Repairs.

Did you complete the repair?

Go to Step 20

--

Replace the DRL relay. Refer Relay Replacement.

Did you complete the replacement?

Go to Step 20

--

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

Did you complete the replacement?

Go to Step 20

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2