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. Place the gear selector in the PARK position if vehicle is equipped with an automatic transmission or apply the parking brake if the vehicle is equipped with a manual transmission.

Do the daytime running lamps remain illuminated?

Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections

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

Does the scan tool indicate that the Daytime Running Lamp parameter is OFF?

Go to Step 4

Go to Step 8

1. Turn OFF the ignition.
2. Disconnect the turn signal/hazard/flasher module.
3. Connect a test lamp between the daytime running lights (DRL) control circuit at the turn signal/hazard/flasher module connector and battery positive voltage.
4. Turn ON the ignition, with the engine OFF.
5. With a scan tool, command the Daytime Running Lamps output control parameter in the DIM output control list ON and OFF several times.

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

Go to Step 5

Go to Step 6

With the turn signal/hazard/flasher module disconnected are both DRL lamps OFF?

Go to Step 7

Go to Step 9

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

Did you find and correct the condition?

Go to Step 12

Go to Step 8

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 12

Go to Step 10

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 12

Go to Step 11

Repair the short to power in the appropriate front turn signal output control circuit. Refer to Circuit Testing and Wiring Repairs.

Did you complete the repair?

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 12

--

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

Did you complete the replacement?

Go to Step 12

--

Operate the system in order to verify the repair.

Did you complete the repair?

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.

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. Turn the headlamp switch to the OFF position.
3. Expose the ambient light sensor to a bright light.
4. Place the gear selector in the PARK position for vehicles equipped with automatic transmissions or apply the parking brake for vehicles with manual transmissions.

Do the daytime running lamps remain illuminated?

Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections

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

Does the scan tool indicate that the Daytime Running Lamp parameter is OFF?

Go to Step 6

Go to Step 4

Is this vehicle equipped with a manual transmission?

Go to Step 5

Go to Step 10

With a scan tool, observe the Park Brake parameter in the DIM inputs data list.

Does the scan tool display ON status?

Go to Step 10

Go to Diagnostic System Check - Vehicle

1. Turn OFF the ignition.
2. Disconnect the daytime running lights (DRL) relay.
3. Turn ON the ignition, with the engine OFF.

Do the daytime running lamps remain illuminated?

Go to Step 11

Go to Step 7

1. Turn OFF the ignition.
2. Connect a test lamp between the DRL relay coil side supply voltage circuit and the DRL relay control circuit.
3. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

Go to Step 8

Go to Step 9

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

Did you find and correct the condition?

Go to Step 14

Go to Step 10

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 14

Go to Step 12

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

Did you find and correct the condition?

Go to Step 14

Go to Step 13

Repair the short to battery voltage in the headlamp low beam supply voltage circuit. Refer to Circuit Testing and Wiring Repairs.

Did you complete the repair?

Go to Step 14

--

Replace the DRL relay. Refer to Relay Replacement.

Did you complete the replacement?

Go to Step 14

--

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

Did you complete the replacement?

Go to Step 14

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2