Switching the seat ventilation on/off
Requirements:
The power supply is switched on.
Press button 
repeatedly until the desired blower setting has been reached.
repeatedly until the desired blower setting has been reached. Depending on the blower setting, up to three indicator lamps will light up. If all indicator lamps are off, the seat ventilation is switched off.
If you switch the power supply off and on again within 20 minutes, the previous seat ventilation setting for the driver's seat will remain active.