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It really sucks when you buy a used car and it turns out that the bozo who owned it before fucked around with the wiring. My 1M had a Lojack like device installed behind the rear seat and caused the battery to drain for no reason. It cost me more than a $1000 to get that POS located and removed and the wires respliced, as well as buying a new battery because the warranty doesn't cover this sort of intentional damage/current drain. The former owner, who did not sell the car to me (he sold it to a dealer from whom I bought it) denied ever putting the Lojack in the car, however there was no one else who could or would have had it installed.
A Z3 Coupe I owned was also mucked around with, both behind the glove box and also in the doors, butchering the central locking system in the process. That cost close to $1000 to rectify, also.
Pricks who don't know what they are doing should refrain from working on the electrical wiring of BMWs, but unfortunately a lot of them do not.
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