My 2002 Sub key fob operates the driver door lock/unlock just fine, it will unlock but not lock all others. The passenger side door button will unlock all but will not lock anything, I have to manually lock all the doors but cannot lock the hatch. Not sure where to start! I have another thread on a battery run down issue that may be related http://www.gmtruckclub.com/forum/showthread.php/138139-intermitant-electric-spook I hope it is not dealer time!!!!!!!!!!!