Switching the seat ventilation on/off
Requirements:
the power supply is switched on
To switch on/increase the level:
press button 
repeatedly until the desired ventilation level is set. Depending on the ventilation level, up to three indicator lamps light up.
To switch off/reduce the level:
press button repeatedly until the desired ventilation level is set. 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 setting of the seat ventilation for the driver's seat remains active.