GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

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

Connector End View Reference: Master Electrical Component List

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

  1. Turn the ignition to the ON position.
  2. Turn the headlamp switch to the OFF position.
  3. Place the headlamp dimmer switch in the flash to pass position.

Do the high beam headlamps illuminated during flash to pass operation?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

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

Are the high beam headlamps operating properly?

Go to Step 4

Go to Headlamps Inoperative - High Beams

4

  1. Disconnect the multifunction turn signal switch.
  2. Connect a jumper between the flash to pass switch signal circuit and ground.

Do the high beam headlamps illuminate?

Go to Step 5

Go to Step 6

5

Inspect for poor connections at the harness connector of the multifunction switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 8

Go to Step 7

6

Repair a high resistance, open, or a short to battery positive voltage in the flash to pass switch signal circuit of the headlamp dimmer switch . Refer to Circuit Testing and Wiring Repairs .

Did you complete the repair?

Go to Step 8

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7

Replace the multifunction turn signal switch. Refer to Turn Signal Multifunction Switch Replacement .

Did you complete the repair?

Go to Step 8

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8

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2