So the 02 sierra has a anti theft system that is total bs. If the truck is locked and u try to open it,it throws a security light that drains your battery until u disconnect the ground for 12hrs,relearn the key from the door and ignition. The system also can stop your engine from starting,cause it to run then die and also cut fuel when your driving. The fuse is tyed in with the starting system.im trying to trace the security wire to the door handle to disconnect it.
Also it has 2 abs modules,so its impossible to deactivate abs. I dont even want abs.