rear door locks

[nycdesignkid]

Hello,

I just noticed that my rear locks and tailgate will not lock when tried with both the remote and from inside the truck. The funny thing is that they will all unlock if locked manually. I have a 03 Yukon. Is this a blown fuse or something else? Thank you in advance!!!!

[Rookie]

I had the same type of problem, On the rear door there should be some pin switches. Clean them up with a scotch bright and put a bit if dielectric grease on them this should take care of it.