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Q:

dead baterie on 1990 BMW 535i

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
batterie completly dead can not open doors with the key called aaa cant open doors with there tools ether please help do i have to break a window to open the car to change the baterie?
(3) Answers
If you can get the car on a lift or get under the car somehow, the battery can be back fed from the starter circuit, it's not easy, but doable. Better if a mechanic do it.

Zee
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Even with a dead battery you should be able to use your actual key to insert and unlock the door or trunk to get to the battery.
you have to turn the key more to the left.. their is a manual switch that engages.... problem solved if your battery is dead