Back-Up Power Supply
WARNING: This page is about a different car, the 2002 Ford RV Cutaway, 2002 Ford Econoline, 2002 Ford E550 Super Duty, 2002 Ford E450 Super Duty, and 2002 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
A back-up power supply is located inside Electronic Crash Sensor (ECS) module. If battery or battery cables are damaged in a collision before sensor circuits close, back-up power supply will provide electrical power to deploy air bags. Back-up power supply will hold a deployment charge for approximately one minute after negative battery cable is disconnected.