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

Connector End View Reference: Master Electrical Component List in Wiring Systems

1

Did you perform the Lighting Systems Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

1. Turn ON the ignition, with the engine OFF.
2. Turn ON the headlamps.
3. Turn the headlamp dimmer switch On and OFF.

Does the high beam indicator operate properly?

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

Go to Step 3

Do the high beam headlamps operate properly?

Go to Step 4

Go to Headlamps Inoperative - High Beams

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. Turn OFF the high beam headlamps.
4. With the scan tool, observe the Highbeam Switch Input parameter in the instrument panel cluster (IPC) inputs data list.

Does the data parameter display Off?

Go to Step 7

Go to Step 5

1. Disconnect the IPC.
2. Connect a test lamp between the high beam indicator control circuit and ground.

Does the test lamp illuminate?

Go to Step 6

Go to Step 8

Test the high beam indicator control circuit for a short to battery positive voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 8

Inspect for poor connections at the harness connector of the lamp control module (LCM). 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 11

Go to Step 10

Inspect for poor connections at the harness connector of 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 11

Go to Step 9

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

Did you complete the replacement?

Go to Step 11

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Replace the LCM. Refer to Lamp Control Module Replacement .

Did you complete the replacement?

Go to Step 11

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2