GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

1

Did you review the Lighting System Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Lighting Systems

2

Verify that the headlamps are inoperative in low beams.

Does the system operate normally?

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

Go to Step 3

3

  1. Remove the DIMMER relay.
  2. Connect a fused jumper wire from cavity 1 to cavity 4 of the socket where the DIMMER relay came from.
  3. Turn the light switch to the head position.

Do the low beams illuminate?

Go to Step 4

Go to Step 5

4

Replace the DIMMER relay.

Is the replacement complete?

Go to Step 6

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5

Locate and repair the open in the BLK wires between the DIMMER relay and the fuses. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 6

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6

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3