Originally Posted by 
Gregz
				
			 
			Hi Burble, from the manual:
The Off-Road 1 height is 35 mm above the normal height setting, up to a maximum vehicle speed of 80 km/h (50 mph). The Off-Road 2 height is 65 mm above the normal height setting, up to a maximum vehicle speed of 50 km/h (31 mph). The suspension height can change automatically between these heights.
The Off-Road 2 height can be manually selected when at Off-Road 1 height, at any vehicle speed up to 40 km/h (25 mph). Press the up-arrow button on the electronic air suspension system controls.