Part 3

Vehicle Dynamic Suspension (Part 3)

Selecting Access Mode Directly from Off-Road Mode
When the suspension is in off-road mode height, pressing the air suspension rotary switch once and then a second time in a downward direction before the height change LED is extinguished, the control module will lower the suspension to access mode height. The control module will remember to return the suspension to off-road height automatically if the vehicle speed increases above 6.2 mph (10 km/h).

Alternatively, pressing the driver's door module access switch once will perform the same function.

Crawl (Locked at Access) Mode
Crawl mode allows the vehicle to be driven at access height. The vehicle is locked in access height and can be selected at a speed of less than 21.7 mph (35 km/h) and can be driven at low speeds to improve clearance in areas with restricted headroom, i.e. car parks. If the vehicle exceeds 25 mph (40 km/h), crawl mode will be canceled and the vehicle will return to on-road height.

To select crawl mode the vehicle must first be in access mode. Crawl mode is selected by pressing the 'hold' button once.

When selected, the hold button LED will be illuminated. When the control module is in crawl mode, on-road mode height will be selected automatically if the vehicle speed exceeds 25 mph (40 km/h). At 18.6 to 21.7 mph (30 to 35 km/h) a message is displayed in the message center to warn the driver to slow down or the vehicle will raise. Crawl mode can also be manually canceled by pressing the hold button once. The access mode LED and the hold LED will be extinguished.

High Speed Mode
High speed mode is a non-selectable, automatic mode which lowers the vehicle height by 20 mm to improve vehicle handling. This feature is fully automated and is 'invisible' to the driver.

If the vehicle speed exceeds 100 mph (160 km/h) for more than five seconds, the air suspension control module initiates the high speed mode. When the vehicle speed reduces to less than 80 mph (130 km/h) for more than 30 seconds, the vehicle returns to the On-Road height. This function is canceled if a trailer is connected to the trailer socket.

Automatic Height Change Warnings
When the suspension is in off-road mode, access mode or crawl mode height, the air suspension control module will change the suspension height automatically when the vehicle speed exceeds a predetermined threshold.

When the suspension is at off-road mode or crawl mode height, the control module issues a warning to advise the driver that the vehicle is approaching the speed threshold. The instrument cluster sounder will emit a chime, a message will be displayed in the message center and the on-road mode LED and the height change LED will flash.

The off-road mode or crawl mode height speed warning is removed when the vehicle speed is reduced.