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 ON 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 ON?

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.
3. Turn ON the high beam headlamps.

Does the test lamp illuminate?

Go to Step 10

Go to Step 6

Test the high beam indicator control circuit for an open, high resistance or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

Go to Step 8

Inspect for poor connections at the high beam indicator bulb and socket. 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 13

Go to Step 9

Inspect for poor connections at the harness connector of the 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 13

Go to Step 12

1. Replace the high beam indicator bulb. Refer to Instrument Cluster Bulb Replacement in Instrument Panel, Gages and Console.
2. Turn ON the high beam headlamps.

Does the high beam indicator illuminate?

Go to Step 13

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 13

Go to Step 11

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

Did you complete the replacement?

Go to Step 13

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Replace the LCM. Refer to Lamp Control Module Replacement .

Did you complete the replacement?

Go to Step 13

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2