System-related causes (no faults)

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- Control tolerance when "Ignition off", but vehicle is awake (e. g. hazard warning switch is lit): ± 7 mm (applies from integration level 10-06-500 or CAF 4.5.4-> Read out SVK; earlier versions ± 15 mm) relative to nominal ride-level height (attention: at the front axle, the control variable is the mean value of the right and left ride height).
- Control tolerance when "Ignition on": +/- 7 mm relative to nominal ride-level height (attention: at the front axle, the mean value of the right and left ride height applies).
- When the doors are open, an automatic level correction does not take place (an active control procedure is aborted). Level changes are performed via buttons even if the doors are open
- If a strong external force acts on the vehicle during a control procedure (rapid loading and unloading), the control procedure may be interrupted; it is resumed either when driving (>30 km/h) or by pressing the ride height selection switch (down->up)
- Vehicle inclination can only be checked on level and horizontal ground. For technical reasons, it is not possible to adjust all wheel stations to the nominal ride-level height on uneven ground. For example, if the one wheel of the vehicle is on the curb, the resulting inclination is not corrected. The self-levelling suspension behaves like a standard steel suspension in this case.
- Active wheel relief mode: To relieve a depressurized tire, the vehicle is inclined using the air suspension. The vehicle is inclined beginning at "Ignition on". This mode is linked to the type pressure monitor and is not closed until the tire pressure monitor ceases to sense a tire pressure loss

The air in the spring struts is warmed by the engine heat and damper work and expands. This raises the vehicle. During a journey, ride height changes due to temperature changes in the air suspension struts are corrected. When the vehicle is stationary and switched off, these temperature effects may lead to ride height changes and inclinations that are not (cannot) be corrected. When the engine is hot, an after-heating effect that occurs after the vehicle is parked, especially at the consumer shutdown, causes the vehicle to be raised slightly and then, in the cooling-down period, to be lowered again. In extreme cases, the vehicle can be lowered by up to 50 mm at the front axle due to this temperature effect. After the vehicle is parked, the self-levelling suspension performs three control procedures in the first 48 h in which, depending on system availability, an attempt is made to reduce inclinations by raising or lower the vehicle to a horizontal level. The self-levelling suspension may lower the vehicle by up to 40 mm below the normal level. For technical reasons, inclinations in vehicles that have been parked for lengthy periods cannot be avoided in air suspension systems. Workshops are not able to check the control functions in parked vehicles due to the system complexity.