Pre mode

In Pre mode (timed initial run/after-run), changes in load are equalized even as the vehicle occupants are getting in and then again for a few minutes after the vehicle is shut down. When the vehicle is locked, the after-run is shortened.

In the Pre mode, the vehicle can only be raised to its specified height if the level drops significantly below the specified height. The tolerance band for the control is approx. 60 millimeters below the mean value. The tolerance band stipulates when the electronic circuitry in the EHC control unit performs regulation. This tolerance ensures that the vehicle is only regulated for heavier loads to increase ground clearance before driving off. Smaller payloads only lead to small amounts of compression travel which are only balanced out after the engine has been started. These control characteristics reduce load on the battery. In pre-mode, only the mean value of the two ride height sensor signals is considered.