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Home >> BMW >> 2003 >> M3 2D Convertible >> Repair and Diagnosis (Single Page) >> Restraints >> Restraints Control Systems >> Passive Safety Systems - Technical Training (E46) >> Passive Safety Systems >> Multi-Restraint System (MRS II) >> Battery Safety Terminal (BST) >> Notes
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Battery Safety Terminal (BST): Notes

The BST is an encapsulated pyrotechnic device. It is designed to prevent short circuits from occurring in the battery power supply to the engine compartment during impacts or collisions.

The ignitor capsule of the BST will be triggered, by the MRS II control module, with any front air bag activation.

The BST may be triggered with a side or rear impact, depending on the severity of the collision as detected by the MRS II control module.

Fig 1: Battery Safety Terminal (BST) Triggered Diagram
G03395859Courtesy of BMW OF NORTH AMERICA, INC.