Quote:
Originally Posted by upallnight
Since pyrotech is used to separate the cable, wouldn't the small cable NOT have power since electrical power will only be present in the event the srs module register an accident?
Careful with playing around if you don't know what you are doing or you may end up setting off some airbags. I think it's time to bring it in to a professional.
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Perhaps the 2 illustrations below will help with how the BST (battery safety terminal) is set up...and what is disconnected when the "pyro" is activated and separates when an accident occurs:
The BST is designed to disconnect the starter & alternator so that the engine shuts down...but the smaller cable runs to the high amp fuse distribution center, and the other fuse locations (front & rear)...which allows other electrical functions to work (doors, locks, windows, SOS ASSIST, phone, etc). So in an accident, the engine may shut down, but allows for other electronics for making emergency phone calls, or operation of the doors and windows (like if the vehicle ends up in water...you have a few minutes that the windows can still be rolled down):