dead baterie on 1990 BMW 535i

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?

by in San Mateo, CA on February 20, 2011
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3 answers
ANSWER by , February 20, 2011
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
ANSWER by , March 26, 2011
you have to turn the key more to the left.. their is a manual switch that engages.... problem solved if your battery is dead
ANSWER by , April 29, 2013
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.