GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Did you perform the Lighting System Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems in Lighting Systems.

2

  1. Turn the ignition to the ON position.
  2. Turn the headlamp switch to the ON position.

Are the low beam headlamps on?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Disconnect the headlamp dimmer switch.

Using a test lamp connected to a known good ground, probe the headlamp dimmer switch low beam circuit.

Does the test lamp turn on?

Go to Step 5

Go to Step 4

4

Repair a poor connection or an open in the headlamp low beam circuit.

Has the repair been made?

Go to Step 6

--

5

Replace the headlamp dimmer switch.

Refer to Multifunction Turn Signal Lever Replacement - On Vehicle in Steering Wheel and Column - Tilt.

Has the repair been made?

Go to Step 6

--

6

Operate the system in order to verify the repair.

Did you correct the condition?

Go to Diagnostic System Check - Lighting Systems

Go to Step 2