Electronic Suspension: Description: Notes

NOTE: Electronic suspension system may also be referred to as load leveling control system or vehicle dynamic suspension system.

Two optional computer controlled air suspension systems are available. Rear Air Suspension (RAS) system, available only on 2WD models, replaces conventional steel coil rear springs with 2 air springs providing low spring rates for improved ride and automatic rear load leveling. Air springs are mounted on rear axle spring seats and to frame upper spring seats, much like conventional steel coil springs.

Four Wheel Air Suspension (4WAS) system is available only on 4WD models. To control ride height at all 4 corners of vehicle, RAS system is combined with front air shock absorbers. Other components include air compressor assembly, air lines, solenoids, height sensor(s) and Generic Control Module (GEM). On both systems, ride height is determined by GEM in response to load, road and driving condition inputs received from 2 suspension mounted height sensors (1 sensor on RAS system), Vehicle Speed Sensor (VSS) and Throttle Position (TP) sensor.