Car completely dead after crash

[b58.brady1]

I have a 2020 540i that was recently rear ended. The airbags did not go off and i was able to drive home, but when i went to turn the car on again to drive it into a shop, its completely dead. The battery terminal is reading 3 volts, and i can’t access my rear battery due to the damage. Anyone know what this could be?

[JeffinOregon]

Maybe an electrical short from a broken or disconnected component or sensor draining the battery.

[jefe2000]

Modern BMWs have a Battery Safety Terminal (aka pyro battery disconnect) that disconnects the electrical system from the battery in the event of a collision. I think of this disconnect commonly being deployed when the airbags also deploy. But maybe the disconnect fired in your case as well.

[XutvJet]

Originally Posted by jefe2000

Modern BMWs have a Battery Safety Terminal (aka pyro battery disconnect) that disconnects the electrical system from the battery in the event of a collision. I think of this disconnect commonly being deployed when the airbags also deploy. But maybe the disconnect fired in your case as well.

^This.