Did you get this resolved? This is one of the problems I'm having with my new-to-me C1500. The lights all work when you use the switch to turn them on but they will not come on when you open the door. I've adjusted the dimmer every way possible and tried the dome light disable button in both positions as well. I'm guessing that one of the door jamb switches must be bad but I'm not sure how to verify that other than to buy one and replace the old one.How do you remove the door jamb switch on a 93 Suburban? It feels like there are somw prongs on the back side, and it should slip out the front. No luck so far with this method. My 1976 had a switch that screwed into the door jamb. Thought I would ask before I created another repair job. Thanks.