Back-Up Power Supply
WARNING: This page is about a different car, the 1996 Ford Ranger and 1996 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
A back-up power supply is used on all models and is located inside diagnostic monitor. If battery or battery cables are damaged in a collision before front impact sensors close circuit, back-up power supply will deploy air bags. Back-up power supply will hold a deployment charge for approximately one minute after positive battery cable is disconnected.