Store frame height, function

W32.33-2087-79

Preconditions

 Vehicle at rest

 Level control operating unit (S22) is activated

 Function raise/lower overall vehicle is selected or lights up

Function sequence

Pressing the top or bottom arrow button activates the raise/lower function.

The level control (CLCS) control unit (A26) receives via the central gateway (CGW) control unit (A2) the signals from the level control operating unit (S22) connected to the single signal acquisition and actuation module (SSAM) control unit (A7a) and actuates the 2-axle vehicle level control valve unit (Y21) at the drive axle as well as the front axle level control valve unit (Y20) in the case of full air suspension.

The 2-axle vehicle level control valve unit (Y21) and the front axle level control valve unit (Y20) aerates or purges the sleeve air springs (43.01) at the drive axle or front axle depending on the selected function. The chassis frame is raised or lowered.

In the multifunction display (A1 p1) of the IC (ICUC) control unit (A1) the message "Towing vehicle outside driving level" is indicated as well as the level control indicator lamp (A1 h14) of the IC (ICUC) control unit (A1) being actuated.

 The function messages from the level control system are not displayed if the driver is in the level control menu.

The left drive axle position sensor (B24), right drive axle position sensor (B25) and front axle position sensor (B27) transmit the change in frame height to the level control (CLCS) control unit (A26).

 As soon as the level control (CLCS) control unit (A26) recognizes the signals from the LH drive axle position sensor (B24), the RH drive axle position sensor (B25) or the front axle position sensor (B27) that the upper or lower frame height limit has been reached then it independently interrupts raising or lowering of the vehicle frame. The vehicle frame therefore remains in the uppermost or lowest maximum position.

If the vehicle frame, and therefore also the cargo area, has reached the desired height, raising or lowering of the vehicle is stopped by pressing the stop button.

The level control (CLCS) control unit (A26) receives via the central gateway (CGW) control unit (A2) the stop signal from the level control operating unit (S22) connected to the single signal acquisition and actuation module (SSAM) control unit (A7a) and, in accordance with the stop signal, actuates the 2-axle vehicle level control valve unit (Y21) at the drive axle as well as the front axle level control valve unit (Y20) in the case of full air suspension. Air is no longer admitted to or released from the sleeve air springs (43.01).

Holding down the memory button M1 or memory button M2 stores the frame height. The level control operating unit (S22) confirms saving of the frame height by flashing all arrows in the function indicator.