2005 Tahoe. The two rear doors and lift gate will remain unlocked intermittently when I use the remote or the manual switch on the drivers door. The front two doors seem to work fine. I assume that it may be an electrical connection for the back doors and lift gate since it is intermittent. It seems to be only the lock feature and not the unlock feature. If I manually lock the back doors they always seem to unlock with the remote. I could live with this except there is no easy way to lock the back lift gate. Any help would be appreciated. Tom