GM Service Manual Online
For 1990-2009 cars only
(Fog Lamps): If your vehicle has fog lamps, the control 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 the ON position for the fog lamps to come on.

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

When the headlamps are changed to high-beam, the fog lamps also go off.

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