99 suburban door locks

I have a 99 suburban and I to have the door lock problem. Has anyone fixed there problem if so how? I also have the day time running light problem, the no lights on the door switches or on the radio. Does anyone have any suggestions?

As I mentioned to another person, I read that if you use wd-40 or something like it and spray it on the door latches that it will free them up to make the locks work smoother. I just sprayed mine this AM so I do not have any comments about how it actually works. Will wait and see. Might be worth a try though.