Current Code 51, Accident Detected: Description
WARNING: This page is about a different car, the 1991 Geo Storm, 1991 Geo Metro, 1990 Geo Storm, and 1990 Geo Metro. However, it is still accessible from the selected car via links, so may be relevant.
DERM determines arming sensor is closed when system voltage or more is present at SENSE HI input, and it determines discriminating sensor is closed when it notes low voltage at SENSE LOW input. Some faults may appear as an accident to DERM and record a Code 51. History Code 51 is not proof vehicle was in an accident.