Overview:
This document contains information on:
General
Function requirement
Seat ventilation control
Manual switching on and off:
Reduction of noise level in the stationary vehicle
Actuation by other systems
General
The seat ventilation has the task of reducing the temperature of the seat cushion or seat backrest. The seat ventilation creates a more pleasant climate for vehicle occupants at high temperatures. The seat ventilation is carried out by centrifugal/axial fans integrated in the seats.
Function requirement
Circuit 15 or circuit 15R ON
Seat ventilation control
At the rear seats, the seat ventilation is controlled by the rear seat control unit of each seat.
Depending on the equipment installed, one of the following control units controls the seat ventilation for the front seats:
Overview of front seat ventilation control |
Installed control units/position of seat heating | Driver seat ventilation | Front passenger seat ventilation |
Without driver's seat control unit | Seat climate control control unit | Seat climate control control unit |
With driver's seat control unit | Driver seat control unit | Driver seat control unit |
With driver's seat control unit | Driver seat control unit | Front passenger seat control unit |
Manual switching on and off:
The seat climate control switch group in the doors of the respective side of the vehicle records the operation signals over the seat ventilation button and transmits these to the control system.
The fan speed can set to 3 different levels. The fan motor of the radial fan operates at different power levels depending on the level activated (100 % / 65 % / 35 %).
The control system sends the stage setting of the seat ventilation back to the seat climate control switch group. This actuates the LEDs in the seat ventilation button accordingly.
The fan speed settings can be adjusted using the diagnosis tester.
Reduction of noise level in the stationary vehicle
In order to reduce the noise level of the seat ventilation when the vehicle is stationary, the seat ventilation is shifted down to level 1 if the vehicle speed drops below 6 km/h. As of 9 km/h, the originally selected stage is activated.
The noise level reduction does not become active until 7 minutes after the respective seat ventilation has been switched on for the first time with the engine running.
Actuation by other systems
For actuation by other systems, the function requirement for circuit 15 or 15R ON does not apply. With circuit 30t, the other systems can also activate the seat ventilation.
The seat ventilation can also be actuated by the following systems:
Convenience feature
Pre-air conditioning
Revitalization
Convenience feature: If circuit 15R is not then switched on within 5 min, the seat ventilation switches off. The seat ventilation also switches off if the vehicle is locked.
Function schematics | |||
Function schematic for actuating front seat ventilation | Model 118, 177, 247 with code 401 (Climatised front seats) | ||
Model 167 with code 401 (Climatised front seats) | |||
Model 213, 238, 257, 290 as of model year 2021 with code 401 (Climatised front seats) | |||
Model 223 with code 401 (Climatised front seats) | |||
Model 293 with code 401 (Climatised front seats) | |||
Function schematic for switching on rear seat ventilation | Model 167 with code 402 (Rear seat climate control) | ||
Model 213 as of model year 2021 with code 402 (Rear seat climate control) | |||
Model 223 with code 402 (Rear seat climate control) | |||
Further basic functions | |||
Seat climate control timer-controlled shutoff, basic function | |||
Seat climate control automatic shutoff, basic function | |||
Control units | |||
Seat control unit, basic function | Vehicles with front seat ventilation and electrical seat adjustment, vehicles with seat ventilation and electrical seat adjustment in rear passenger compartment | ||
Seat climate control unit, basic function | Vehicles with seat ventilation and without front electrical seat adjustment |