Are there any post-accident failsafes?

E91 Hoarder · 01-28-2023, 11:43 PM

Car was in frontal accident. Both front airbags deployed. I charged up the battery, but the car does not turn on, show any signs of power, nor reacts to the key (with comfort access).

Are the any failsafes that completely cut power when a car is in accident? Any advice?

Efthreeoh · 01-29-2023, 12:28 AM

Battery Safety Terminal blew.

Serf27 · 01-29-2023, 03:20 AM

Yup, battery safety terminal blows.

It is it attached to the + battery terminal.
It deploys because the 12V, thick wire running from the battery to the starter/alternator is not fused.
IE: possible fire during an accident.
IE: no power to starter.

I have used BST cables from Amazon with success.

JUST RE-READ YOUR OP

The BST cuts power to the starter, but you still have functions of everything else.
IE: ACC mode, lights etc. etc.

E91 Hoarder · 01-30-2023, 01:51 PM

Quote:

Originally Posted by Serf27

Yup, battery safety terminal blows.

It is it attached to the + battery terminal.
It deploys because the 12V, thick wire running from the battery to the starter/alternator is not fused.
IE: possible fire during an accident.
IE: no power to starter.

I have used BST cables from Amazon with success.

JUST RE-READ YOUR OP

The BST cuts power to the starter, but you still have functions of everything else.
IE: ACC mode, lights etc. etc.

Thank you. Wonder why no power to the rest of the car.

Noticed some water in the rear passenger footwells. Are there any electronics hidden under the carpet that may may short and cause this?

Serf27 · 01-30-2023, 01:57 PM

None that would cause a whole electrical shut down.
Are you sure the battery held charge?
I suspect the battery is too weak to do anything.

crashoverride · 03-13-2023, 05:58 PM

no update..?? For future readers..??

E91 Hoarder · 07-29-2024, 07:13 PM

Quote:

Originally Posted by crashoverride

no update..?? For future readers..??

It was a BTS. It blew up at the accident. Replaced and everything worked.

01-28-2023, 11:43 PM	#1
E91 Hoarder Captain 141 Rep 903 Posts Drives: E91 AWD, E91 RWD, E90, X535i Join Date: Oct 2011 Location: On the Road iTrader: (8)	Are there any post-accident failsafes? Car was in frontal accident. Both front airbags deployed. I charged up the battery, but the car does not turn on, show any signs of power, nor reacts to the key (with comfort access). Are the any failsafes that completely cut power when a car is in accident? Any advice? __________________ "Let me see what I can do... sir" Last edited by E91 Hoarder; 01-28-2023 at 11:49 PM..
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01-29-2023, 12:28 AM	#2
Efthreeoh General 19919 Rep 19,259 Posts Drives: The E90 + Z4 Coupe & Z3 R'ster Join Date: May 2012 Location: Verginny iTrader: (0)	Battery Safety Terminal blew.
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01-29-2023, 03:20 AM	#3
Serf27 Brigadier General 2899 Rep 4,333 Posts Drives: 335i Join Date: Apr 2018 Location: Sitting in a BMW. iTrader: (-1)	Yup, battery safety terminal blows. It is it attached to the + battery terminal. It deploys because the 12V, thick wire running from the battery to the starter/alternator is not fused. IE: possible fire during an accident. IE: no power to starter. I have used BST cables from Amazon with success. JUST RE-READ YOUR OP The BST cuts power to the starter, but you still have functions of everything else. IE: ACC mode, lights etc. etc. Last edited by Serf27; 01-29-2023 at 03:29 AM..
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01-30-2023, 01:57 PM	#5
Serf27 Brigadier General 2899 Rep 4,333 Posts Drives: 335i Join Date: Apr 2018 Location: Sitting in a BMW. iTrader: (-1)	None that would cause a whole electrical shut down. Are you sure the battery held charge? I suspect the battery is too weak to do anything.
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03-13-2023, 05:58 PM	#6
crashoverride Lieutenant 191 Rep 585 Posts Drives: na Join Date: Jul 2006 Location: na iTrader: (0)	no update..?? For future readers..??
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