I believe the "Perimeter" claim of the system is just marketing. There is no radar device that comes with it. It's working directly off movement.Yes, DEI (Viper, Clifford, etc.) has a 12v backup battery option. (DEI 520T) It's easy to slide under some lifted vehicles to cut the ground from the battery at the frame. On our Jeep, there's no hood lock and the latches are on the hood. Even then, with the doors off, they'd have access to a hood release anyway. A good installer would need to identify and isolate the constant power to the factory alarm module. Another option would be to add an actual DEI alarm module with a T-harness adapter designed specifically for the Bronco. This will also sound the alarm the moment the battery is disabled.
I've read this thread a couple times today and it's still not clear to me what the "Perimeter Plus" module actually adds. I have a hard time believing it just adds shock and tilt sensors to the factory "modular security system". Since the doors come off, I'm hoping it adds a proximity radar as well, so if someone is too close it "warn away" chirps, or goes into full siren if someone reaches in to the cab area. We have this feature on the Jeep and it works amazingly well after an hour of fine tuning.
If the Plus module doesn't have a proximity sensor, we're going to just add the Viper/Bronco adapter w/T-harness and the DEI 508D proximity module, a 520T backup battery for the main system and a DEI 515R mini siren w/built in battery inside the cab.
We've tracked our Bronco to our local rail yard, just waiting for it to make it to the dealership now.
Thanks to the OP for this thread, I assumed all features were included because of the widow sicker too, but after some searching learned it's a modular system and some features are sold separately.
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