See also:

Mercedes-Benz M-Class Owners Manual
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Activating/deactivating
The evaporator is ventilated when the airconditioning system is operated. The blower is activated automatically approximately one hour after the vehicle has been locked. The blower operates on ...

Tire pressure of at least 180 kPa(1.8 bar/26 psi) is not reached
If, after five minutes, a pressure of 180 kPa (1.8 bar/26 psi) has not been achieved: ► Press the on/off switch on the tire inflation compressor to 0. The tire inflation compressor is ...