Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Function of Air Springs: Pre-mode
Pre-mode is activated by the "Load cutout OFF" signal (e. g. in response to opening of the door or unlocking with the radio remote control). The Pre-mode then stays set for 16 minutes and is restarted with a change in status.
The ride height of the vehicle is monitored and evaluated with a wide tolerance band.
In Pre-mode, the vehicle is only controlled up to the nominal height if the level is significantly below the nominal height. This control tolerance ensures that the vehicle is only controlled up in the case of large loads in order to increase the ground clearance prior to departure. Small loads give rise to small compression travel and this is compensated only when the engine is started. This control setting helps to reduce the battery load.
| Coding parameter | Value | ||
|---|---|---|---|
| niv_pre_up_e | - 09 mm | ||
| niv_pre_up_d | - 07 mm | ||
| niv_pre_down_e | + 09 mm | ||
| niv_pre_down_d | + 07 mm | ||
| niv_pre_mw_up | - 59 mm(1) | ||
| niv_pre_mw_down | 0 mm | ||
| pre_delay_counter | 20 min | ||
|
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With single-axle air suspension, the vehicle is controlled down when the mean value of both ride height signals is > 0 mm and one side is in excess of + 10 mm.
In this mode, only the mean value of the two ride height signals (fast filter) is considered when deciding whether there is a need for a control operation.
There is no inclination detection in Pre-mode.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.