Surely that 3k is for cars that don’t even have the rear view camera. I’m assuming that’s the hardest part, with it being the longest distance to neatly get a wire through the cabin?
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4 cameras for the 360. A different Rear camera is fitted and may not be the same type of electrical/data signal connection. Both Door mirrors need to be dismantled with the door opened up to fit the side cameras, front of the car grill removed to fit the camera and then the control module for the 360 and the wiring routed as intended and will need to be fitted somewhere on the front, in the dash or in the footwell area.
Quite possibly, the seats/center console/dashboard have to be removed to lift the carpet etc, then dashboard/mmi connection have to be accessed.
Once all connected, chances are the new 360 control box need to be adapted into the car compute modules for forward motion, reverse selection, left/right steering wheel pickup etc.. it to work and not throw any errors of unidentified units and then shutdown.
Its way way too smart for retrofit if factory integration tools are not available, hence the high retrofit price tag, just on labour and knowhow.
I have also heard, the usual CANBUS integrated immobilisers are also being designed to be rejected as an alien entity, by the car's own compute modules as service department have found them to be a real nuisance when they kick in while in diagnostic mode/runs.