Hi, I have a 2004 Chevy Tahoe and I am having problems with the Power locks. The front doors will lock but the back doors and rear hatch will not. It used to only be the key fob it would do this wihh and I could use the panel and lock (sometimes it took a few tries of unlocking and locking) and now it doesn't work. I am trying to find a way to fix this on our own, not take it in as I am having a new engine installed next week.