My truck is a 1993, and the front "Door Jamb Switch" is located in the side of the dash. You actually have 5 door jamb switches in a Suburban, 2 for the front, 2 for the rear doors, and one for the tailgate. These are not wired in a continuous circuit i.e. if one switch does not work, the interior lights will come on from one of the others. If that is not the case, be sure that the override "lights off" rocker switch on the dash has not been set to off. It was the one door jamb switch on mine that was bad. Remove from under the dash by depressing the plastic prongs. Small hands are very beneficial for that job!