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

1

Was the Lighting System Diagnostic System Check performed?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

1. Turn ON the ignition, with the engine OFF.
2. Move the gear selector out of the PARK position.
3. Verify that the headlamp switch is in the OFF position.
4. Expose the sunload sensor to a bright incandescent lamp.
5. Wait more than 3 seconds.

Do the DRL headlamps operate properly?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

1. With a scan tool, select from the Dash Integration Module (DIM) Special Functions Output Controls, the Daytime Running Lamps.
2. Command the DRL relay ON and OFF.

Do you hear a click when you command the DRL relay ON and OFF?

Go to Step 6

Go to Step 4

1. Turn OFF the ignition.
2. Disconnect the DRL relay.
3. Turn ON the ignition with the engine OFF
4. Connect a test lamp between the battery positive voltage circuit of the DRL relay coil and a good ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 14

1. Connect a test lamp between the battery positive voltage circuit of the DRL relay coil and the control circuit of the DRL relay.
2. With a scan tool, command the DRL relay ON and OFF.

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

Go to Step 11

Go to Step 10

1. Turn OFF the ignition.
2. Disconnect the DRL relay.
3. Turn ON the ignition, with the engine OFF.
4. Connect a test lamp between the battery positive voltage circuit of the DRL relay switch and a good ground.

Does the test lamp illuminate?

Go to Step 7

Go to Step 15

Connect a 15 amp fused jumper between the battery positive voltage circuit of the DRL relay switch and the DRL supply voltage circuit.

Do the DRL headlamps illuminate?

Go to Step 11

Go to Step 8

1. Turn OFF the ignition.
2. Reconnect the DRL relay.
3. Disconnect the DRL resistor.
4. Turn ON the ignition with the engine OFF
5. Connect a test lamp between the supply voltage circuit of the DRL resistor and a good ground.
6. With a scan tool, command the DRL relay ON.

Does the test lamp illuminate?

Go to Step 9

Go to Step 16

1. Connect a 15 amp fused jumper between the supply voltage circuit of the DRL resistor and the DRL resistor signal circuit.
2. With a scan tool, command the DRL relay ON.

Do the DRL headlamps illuminate?

Go to Step 13

Go to Step 17

Test for an open or high resistance in the control 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 21

Go to Step 12

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 21

Go to Step 19

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 21

Go to Step 20

Inspect for poor connections at the daytime running lamp (DRL) resistor. 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 21

Go to Step 18

Repair an open or high resistance in the battery positive voltage circuit of the DRL relay coil. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 21

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Repair an open or high resistance in the battery positive voltage circuit of the DRL relay switch. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 21

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Repair the open in the supply voltage circuit of the DRL resistor. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 21

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Repair the open or high resistance in the signal circuit of the DRL resistor . Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 21

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Replace the DRL resistor. Refer to Daytime Running Lamps (DRL) Resistor Replacement .

Did you complete the replacement?

Go to Step 21

--

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

Did you complete the replacement?

Go to Step 21

--

Important:: Perform the setup procedure for the Dash Integration Module (DIM). Refer to Body Control Module (BCM) Programming/RPO Configuration .

Replace the DIM. Refer to Dash Integration Module Replacement in Body Controls.

Did you complete the replacement?

Go to Step 21

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2