Code 22 - SAFING Sensor Shorted: Description
WARNING: This page is about a different car, the 1995 Ford Pickup, 1995 Ford F-Super Duty, 1995 Ford Cab & Chassis, and 1995 Ford Bronco. However, it is still accessible from the selected car via links, so may be relevant.
Diagnostic monitor measures voltage at terminals No. 11 and 12. Voltage at these 2 terminals is controlled by 2 resistors inside diagnostic monitor and resistors located within impact sensors. This voltage varies with charging system voltage. If voltage at both terminals exceeds 5 volts, Code 22 will be set.