Im guessing, but id think there exist security cut-outs that dont entirely disconnect the battery, just the ignition system, meaning anything else still works.
The used car people often install GPS trackers and ignition disconnects in case people stop making payments. it allows them to both kill the ignition or starter and find it. Mine had one when I got it, I discovered it when doing something under the dash with the wiring. I removed it but am tempted to buy one of my own that I can control. I think when I looked them up they could be had for $50 or less, I dont know what it costs to activate or monitor one. I would guess they cost and do nothing until needed, then work through a website to activate it upon request. That probably costs, but would be a cheap alternative to losing a vehicle.
