On my 91 4-door, I think it was right by one of the speaker mounting screws - this switch is maybe 3/4 inch long (2 cm) - it's just a little black slide-switch.
Pop the trim panel under the steering wheel, and take the speaker out - you'll find it eventually - should be real close to the surface - not buried back behind the dash.
When my 1995 2-door light went on, I had just bought it, and was driving it home from Dallas to Denver.  I didn't even stop - I popped the trim panel, and flipped the switch by feel, in the dark.
EDIT: I guess I need to find a better place to host my avatar! Drat!