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

Did you review the Lighting System Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Lighting Systems

Verify that the daytime running lamps (DRL) are inoperative.

Does the system operate normally?

Go to Testing for Electrical Intermittents in Wiring Systems

Go to Step 3

Using a Tech 2, command the DRL indicator ON.

Did the DRL indicator turn ON?

Go to Step 4

Go to Step 12

Using a Tech 2, command the DRL system ON.

Did the DRL turn ON?

Go to Step 11

Go to Step 5

1. Remove the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gages and Console.
2. Using a fused jumper wire, connect the DRL relay ground signal circuit to a known good ground.

Did the headlamps turn ON?

Go to Step 11

Go to Step 6

1. Remove the DRL relay.
2. Using a digital multimeter (DMM), check continuity of the DRL relay ground signal circuit between the instrument cluster and the DRL relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and complete the repair?

Go to Step 14

Go to Step 7

With the relay still removed, check for battery positive voltage at the DRL relay supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and complete the repair?

Go to Step 14

Go to Step 8

With the relay still removed, check for ground at the DRL relay ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and complete the repair?

Go to Step 14

Go to Step 9

With the relay still removed, using a fused jumper wire, connect the DRL relay ground circuit and the headlamp ground circuit at the DRL relay.

Did the headlamps turn ON?

Go to Step 13

Go to Step 10

Repair the headlamp ground circuit between the DRL relay and the headlamp ground. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 14

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1. Remove the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gages and Console.
2. Inspect the parking brake ground circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 14

Go to Step 12

Replace the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gages and Console.

Did you complete the replacement?

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