System Inhibits

The ISCM is programmed to inhibit normal height change operation under conditions where it is undesirable.

If the vehicle is jacked, the ISCM detects the condition a few seconds after starting to correct the suspension height. The same logic also detects if the rear of the vehicle is grounded. If it detects one of these conditions, the ISCM inhibits normal leveling control. If the rear wheels subsequently start to spin, the ISCM raises the rear suspension to help release the vehicle from grounding. Normal leveling control resumes when the engine is running and the rear suspension is more than 30 mm (1.18 in.) below the nominal kerb weight height, or the vehicle speed exceeds 10 mph (15 km/h).