The TB taillights only light up for brakes on the top and for turns on the bottom....they are not quad tails unless you modify them. The parking lights are only lit on the top as well, unless they have been modded to be quads.I am interested in this answer as well. I just purchased a used 2005 and found out my top and right brake lights don't work (but the left one does!). Checked bulbs and they are ok. Taillights work and flashers work. It's funny, after that, I was following a trailblazer on the road and noticed the same problem on his!
The envoy lights are the same (but different). There is only one brake lamp per side.The TB taillights only light up for brakes on the top and for turns on the bottom....they are not quad tails unless you modify them.
Well, I just read your post, you let us go down the wrong trail. You should have said, my brake lights don't work, the centre one is ok.02 Envoy lower brake lights don't work, center one does, bulbs and fuses look good, any suggestions?