Seats: Description and Operation
Air-conditioned Seats
General information
Seat ventilation or ventilation for the two front seats (standard or fully electric seats) is available as an option for the first time in conjunction with heated seats for the new 911 models. Three comfort settings can be activated independently using buttons in the air conditioner operating panel. The fans integrated in the seat and in the backrest remove perspiration between the passenger and the surface of the seat. This ensures that passengers enjoy pleasant and dry seating comfort without drafts, even in extreme heat.
Advantages of air-conditioned seats:
- Healthy and warm/dry air conditioning on the seat surface
- Improved passenger comfort by regulating the transport of heat/moisture
- Increased personal comfort
- Excellent seating comfort
Operating principle of air-conditioned seats
Fine perforations in the leather cover on the center strip of the seat and backrest allow the surface ventilation or airing of the seat upholstery. The passengers' requirements with regard to seating comfort for the two front seats can be met individually by adjusting the ventilation and air-conditioning level and selecting the required seat heating setting.
Seat ventilation/airing can be switched on and off at the touch of a button on the air conditioner operating panel. The highest of the three comfort settings is activated first when you touch the button. The three LEDs in the switch show which ventilator setting is currently activated.
The seat surface is ventilated evenly by a fan controlled by the air conditioner operating panel and integrated in both the seat and backrest. The efficient and acoustically discrete fans draw off perspiration between the passenger and the surface of the seat through the perforated center strip in the seat and backrest. The intake air flows through an air-permeable cushioned mat, is transported off via special air ducts arranged in the seat and is directed into the interior of the vehicle. In this way, the seat surfaces heated by the sun cool down quickly and prevent perspiration.
Seat ventilation can be combined with seat-heating temperature control. This ensures the continuous removal of moisture while maintaining a pleasant seat-surface temperature.
NOTE:
- A temperature sensor is integrated in the heating element in the seat surfaces of both seats.
- A temperature of at least 59° F. (15° C.) must be measured both by the temperature sensors in the seats and the interior temperature sensor (in the operating panel). Seat airing and ventilation is not switched on or off if the temperature is less than 59° F. (15° C.) in order to prevent supercooling.
Controlling air-conditioned seats
The fan modules in the seat surfaces and backrests are activated directly from the air conditioner operating panel. The PWM signal used for this has a frequency of 100 Hz. The three possible settings run at 100%, 78% and 68%. The fans are powered directly by the vehicle electrical system (terminal 15).
Seat ventilation and seat heating only works when the engine is running. The decision as to whether both systems (seat ventilation and seat heating) are activated depends on the air conditioner operating panel.
NOTE:
- The fans are no longer activated or switched off automatically by the air conditioner operating panel when the voltage is less than 9 volts and more than 16 volts.
- The signal from the temperature sensor (sensor integrated in the seat-surface heating element) is used to regulate seat heating.
Components of air-conditioned seats
The system, which can be ordered as an option together with seat heating, comprises the following main components:
- 3-stage operating button in the air conditioner operating panel next to the operating button for seat heating for driver and passenger
- Fan modules for the seat surface (item 1) and backrest (item 2)
- Air ducts in the seat surface and backrest (see arrows for air routing)
- Air-permeable cushioned mats
- Main wiring harness (not described here)
Fan modules for the seat surface and backrest (here: seat surface)
Air ducts for the seat surface and backrest
Air-permeable cushioned mats (here: seat surface)
