Disconnecting battery would likely reset, I pulled my own alarm and installed a Compustar alarm/start system so I do have a spare oem alarm. If you unplug alarm you’ll not be able to start as there is a starter kill on them that goes through the brain (without wiring mods) on my 2001. Factory alarm on these things is pretty simple, it appeared as it only triggers with front doors and ignition, so errors are limited to that. I’d “assume” (without poking around your truck with a meter) errors would be from a faulty door trigger, likely drivers because it’s used significantly more.