Code 22 - SAFING Sensor Shorted: Description
WARNING: This page is about a different car, the 1996 Ford Probe. 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 are controlled by 2 resistors inside of 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.