Inside Courtesy Lights Won't Go Off

[iron man]

Originally Posted by YellaBlazer

This may be a stupid question, but did you make sure the passanger side door was completely closed too?

Yes that was the first thing I did. I didn't pull the 3rd brake light off yet to make sure the bulb sockets were nice and shiny and not rusted to oblivion.

Originally Posted by Tex Dawg

There is a door jam switch on either side of the dash that when closing the door it pushes a plunger down on the switch making the light go out, if one is bad, it will keep your lights on, replaced a bunch of them when I worked at the dealer, sorry this info came from a Texans & hope no one was offended by it.

Thats on the old body style. 99 new body Sierra doesn't have the plunger, its got a switch in the mechanism.