GM Service Manual Online
For 1990-2009 cars only
(Fog Lamps): For vehicles with 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 the ON/RUN position for the fog lamps to come on.

Press to turn the fog lamps on or off. A light will come on in the instrument panel cluster.

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.