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

DEFINITION: The daytime running lamps operate properly, but the daytime running lamp indicator is inoperative.

Did you review the daytime running lamps (DRL) operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Lighting Systems

1. Start the engine.
2. Place the headlamp switch in the OFF position.
3. Ensure the park brake is disengaged.

Does the DRL indicator illuminate?

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

Go to Step 3

1. Disconnect the DRL indicator lamp relay.
2. Connect a fused jumper wire between the DRL indicator control circuit of the DRL indicator lamp relay and a good ground.

Does the DRL indicator illuminate?

Go to Step 4

Go to Step 5

Connect a fused jumper wire between the DRL indicator control circuit of the DRL indicator lamp relay and the switch side output circuit of the DRL indicator lamp relay.

Does the DRL indicator illuminate?

Go to Step 7

Go to Step 10

1. Remove the instrument panel cluster (IPC).
2. Probe the voltage supply circuit of the DRL indicator at the IPC connector with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 6

Go to Step 11

1. Replace the DRL indicator lamp relay.
2. Connect a test lamp between the voltage supply circuit of the DRL indicator at the IPC connector and the DRL indicator control circuit at the IPC connector.

Does the test lamp illuminate?

Go to Step 8

Go to Step 12

Inspect for poor connections at the DRL indicator lamp 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 15

Go to Step 13

Inspect the DRL indicator bulb for an open filament or poor connection. 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 15

Go to Step 9

Inspect for poor connections at the IPC. 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 15

Go to Step 14

Repair an open or high resistance in the DRL indicator control circuit between the DRL indicator lamp relay and splice 336. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 15

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Repair an open or high resistance in the voltage supply circuit of the DRL indicator. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 15

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Repair an open or high resistance in the DRL indicator control circuit between the IPC and the DRL indicator lamp relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 15

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Replace the DRL indicator lamp relay.

Did you complete the replacement?

Go to Step 15

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

Did you complete the replacement?

Go to Step 15

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3