Electrical System
WARNING: This page is about a different car, the 1996 Subaru SVX. However, it is still accessible from the selected car via links, so may be relevant.
SRS, powered directly from battery, can function with ignition switch in any position. System can also function when and passenger-side seats are unoccupied. The main functions of electrical system are detecting an impact, switching electrical power to inflator for air bag, and monitoring system readiness.