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Home >> BMW >> 2003 >> 745Li >> Repair and Diagnosis >> Restraints >> Restraints Control Systems >> Intelligent Safety Integration System - Overview >> Intelligent Safety Integration System (ISIS) >> System Overview >> A-Pillar Satellite Sensors >> Self-Diagnosis In Normal Operation

Self-Diagnosis In Normal Operation

In normal operation, there is a constant check of the trigger circuits. A fault message is issued, but only when the fault is confirmed over a specified period of time.

If a short circuit to ground or B+ is detected, the corresponding ignition capacitor is discharged.

In normal operation, the self-diagnosis is restricted to checks of the trigger circuit for short circuits and open circuits.