GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Lighting System Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

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

Are the low beam headlamps on?

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Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Disconnect the headlamp switch.

Using a test lamp connected to a known good ground, probe the headlamp 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. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Has the repair been made?

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Go to Step 6

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5

Replace the headlamp 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

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6

Operate the system in order to verify the repair.

Did you correct the condition?

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Go to Diagnostic System Check - Lighting Systems

Go to Step 2