GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Was A Diagnostic System Check performed?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

  1. Remove the fog lamp switch.
  2. With the fog lamps on, test for positive battery voltage at terminal C of the fog lamp connector.

Is positive battery voltage present?

Go to Step 3

Go to Step 4

3

Test for poor connections at the fog lamp switch. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Are poor connections present?

Go to Connector Repairs

Go to Step 5

4

Repair open in the fog lamp feed circuit. Refer to Wiring Repairs in Wiring Systems.

Is repair complete?

System OK

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5

Replace the fog lamp switch Refer to Fog Lamp Switch Replacement .

Is the repair complete?

System OK

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