With this feature, the electronically controlled air suspension keeps the rear of the vehicle level under all load conditions. The system maintains the vehicle at the currently selected ride height. There are two ride heights: Normal Ride Height and Extended Ride Height. The Extended Ride Height feature is only available if the vehicle speed is below 40 mph (64 km/h). If the vehicle is at Extended Ride Height and the speed exceeds 40 mph (64 km/h), the system will automatically return the vehicle to Normal Ride Height.

The activation and deactivation of the Extended Ride Height feature is controlled by this switch on the instrument panel.

The system includes a compressor, two height sensors and two air springs supporting the vehicle.

The system is activated when the engine is started and deactivated when the ignition is returned to OFF. The engine must be running for the rear of the vehicle to be raised and the doors must be closed to enable a transition between Normal Ride Height and Extended Ride Height.

The compressor may be heard while the system is active and the release of air similar to a hissing sound may also be heard. This is normal.

Load leveling will not function normally with the inflater hose attached to the inflator outlet. Remove the hose from the outlet when it is not in use. See Accessory Inflator.

Overload protection is designed to protect the air suspension system and is an indication to the driver that the vehicle is overloaded.

If the rear suspension remains at a low height, the rear axle load has exceeded GAWR (Gross Axle Weight Rating). When the overload protection mode is activated, the compressor operates for about 30 seconds to one minute without raising the vehicle depending on the amount of overload. This will continue each time the ignition is turned on until the rear axle load is reduced below GAWR. The system may reactivate without cycling the ignition if some of the excess load is removed.

If the total rear GAWR (Gross Axle Weight Rating) is reached, the suspension may be slightly less than level. This is normal and does not mean there is a problem with the air suspension.

In some instances the compressor may stop working due to being overheated. This is normal. In the instance of an abnormal overheat condition though the compressor will stop working and the SERVICE SUSPENSION SYSTEM will be displayed on the DIC. See DIC Warnings and Messages for more information.