This fault is actually quite common, second only to a broken webbing in the passenger seat (occupancy sensor). Here is a diagram of the BST: The fault may be with the igniter capsule too. Here's the unit that might need replacing:
Current Garage: e36 Convertible, e63 M6,F82 M4, R53 Cooper S, F57 JCW, R53 JCW GP1, Porsche Panamera, Porsche 991 C4S
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