GM Service Manual Online
For 1990-2009 cars only
(Fog Lamps): If your vehicle has fog lamps, the button is located on the exterior lamps control. The exterior lamps control is located on the instrument panel to the left of the steering column.

The ignition must be in RUN for the fog lamps to illuminate.

To turn the fog lamps on, press exterior lamps button. A light will come on in the instrument panel cluster to show that the fog lamps are on. Press the exterior lamps button again to turn the fog lamps off.

The ignition must be in RUN and the parking lamps must be on for the fog lamps to work. The parking lamps will turn on automatically when the fog lamps are turned on.

The fog lamps will go off while you change to high-beam headlamps.

Some localities have laws that require the headlamps to be on along with the fog lamps.