GM Service Manual Online
For 1990-2009 cars only

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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 System Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Place the headlamp switch in the HEAD position.
  2. Place the headlamp dimmer switch in the high beam position.

Does the high beam indicator illuminate?

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

Go to Step 3

3

Do the high beam headlamps illuminate?

Go to Step 4

Go to Headlamps Inoperative - High Beams

4

  1. Disconnect the instrument panel cluster connector.
  2. Probe the headlamp high beam supply voltage circuit of the instrument panel cluster connector with a test lamp that is connected to ground.

Did the test lamp illuminate?

Go to Step 6

Go to Step 5

5

Repair a open or high resistance in the headlamp high beam supply voltage circuit of the instrument panel cluster. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 7

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6

Important: Perform the set up procedure for the Instrument Panel Cluster (IPC).

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

Did you complete the replacement and the set up procedure?

Go to Step 7

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7

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2