Active Seat Ventilation
The active seat ventilation option provides the occupants with individual climate control for the seat and backrest surfaces.
Active seat ventilation is available for both the driver's and front-passenger seats. Active seat ventilation can be activated from the status terminal 15 ON.
Stage 3 is engaged when the button is pressed for the first time. This sets the maximum fan stage for seat and backrest.
The next stage lower or OFF is selected on further pressing of the button. Active seat ventilation is deactivated if the button remains pressed for longer than 1.2 seconds.
| Index | Explanation |
|---|---|
| 1 | Button for active seat ventilation, driver's seat |
| 2 | Button for active seat ventilation, pass seat |
The button for the active seat ventilation is located in the IHKA/audio control panel. The seat module has sole responsibility for this function. The integrated automatic heating and air conditioning system evaluates the signals for operating the active seat ventilation and sends the button status to the seat module. This allows the seat module to receive the request, activate the fan and monitor their operation.
Depending on the heating stage, the seat module sends the request for the function to be indicated in the button LEDs to the integrated automatic heating and air conditioning system.
Nine fans are accommodated in each seat. The fans are switched on by the seat module and activated separately for backrest and seat surface. For active ventilation, the seat has two speed stages for the fans, depending on the air-conditioning stage. The seat surface has five fans, while the backrest has four fans.
Seat ventilation stages:
| Ventilation stage | Fans, seat | Fans, backrest |
|---|---|---|
| 3 | High | High |
| 2 | High | Low |
| 1 | Low | Low |
| 0 | OFF | OFF |
After having been activated for a period in excess of 10 minutes, active seat ventilation is automatically switched down from Stage 3 to Stage 2.
The activated seat ventilation function remains stored for up to 15 minutes after the status terminal 15 OFF. The previously selected seat ventilation stage is switched on again if in this time the status terminal 15 ON is received by the seat module.
The energy management system in the vehicle can deactivate active seat ventilation briefly depending on the vehicle's energy balance. The function indicator is retained however.