Dimmer switch, top of the column. Under 20 bucks. Have to take off the lower trim panel, the knee bolster, the two big nuts, then lower the column onto the seat. Remove two nuts that hold the switch, unplug harness, replace. Note that there is a clip to remove on the new switch once you place the rod in the proper location.

 

Jay, you wouldnt happen to have a part number?

 

Go to rockauto.com, pick your year, make, model, then switches, then "dimmer switch".