GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1998 🢒 DeVille 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Fog Lights System Check

Step

Action

Normal Result(s)

Abnormal Result(s)*

1
  1. Turn the ignition switch to the OFF position.
  2. Place the headlamp switch in the OFF position.
  3. Place the front fog lamps switch in the OFF position.
  4. Place the rear fog lamps switch in the OFF position.

All of the fog lamps are OFF.
    •  Fog Lamps Always On

2
  1. Turn the ignition switch to the RUN position.
  2. Place the front fog lamps switch in the ON position.
    • Both of the front fog lamps light.
    • The fog lamp indicator lights.

3

Pull the multifunction lever (headlamp dimmer switch) in order to operate the flash-to-pass function.

When the multifunction lever is held in, the following actions occur:

    • Both of the front fog lamps turn OFF.
    • The high beam headlamps turn ON.

When the multifunction lever is released, the following actions occur:

    • The high beam headlamps turn OFF.
    • Both of the front fog lamps turn ON.

Headlight System Check

4
  1. Place the headlamp dimmer switch in the LOW position.
  2. Place the headlamp switch in the ON position.
  3. Place the rear fog lamps switch in the ON position.
    • Both of the rear fog lamps light.
    • Both of the front fog lamps remain ON.

* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.