Seat Ventilation, Basic Function - GF91.30-P-9901A

Model all (CAR) 

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 (or vehicle condition LIVING)

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 Without front passenger seat control unit	Seat climate control control unit	Seat climate control control unit
With driver's seat control unit Without front passenger seat control unit	Driver seat control unit	Driver seat control unit
With driver's seat control unit With front passenger 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 seat ventilation can also be switched on or off via the voice control system. Depending on the equipment installed, remote control through the tablet PC in the rear armrest is also possible.

The fan speed can set to 3 different levels. Depending on the stage engaged, the fan motor of the radial/axial fans operates at different output (100 %/65 %/35 %, the power stages may vary slightly depending on the vehicle model).

Model 118, 167, 177, 243, 247, 293

Model 213, 238, 257, 290

as of model year 2021

Depending on the configuration, the seat ventilation motors are first actuated in the "suction" direction of rotation (seat cooling); after 10 minutes, the direction of rotation is reversed to "blowing" (seat ventilation).

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 stage 1 if the vehicle speed drops below 8 km/h. As of 12 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.

Model 118, 167, 177, 243, 247, 293

Model 213, 238, 257, 290

as of model year 2021

For convenience opening of the vehicle, depending on the configuration, the seat ventilation motors of the driver seat are first actuated in the "suction" direction of rotation (seat cooling). If circuit 15R is then not switched on within 5 minutes or the vehicle is locked again, the seat ventilation is switched off.

	Function schematics
	Function schematic for actuating front seat ventilation	Model 118, 177, 243, 247 with code 401 (Climatised front seats)	PE91.30-P-2501-97A
		Model 167 with code 401 (Climatised front seats)	PE91.30-P-2501-97B
		Model 206, 254 with code 401 (Climatised front seats)	PE91.30-P-2501-97F
		Model 213, 238, 257, 290 as of model year 2021 with code 401 (Climatised front seats)	PE91.30-P-2501-97D
		Model 223 with code 401 (Climatised front seats)	PE91.30-P-2501-97E
		Model 232 with code 401 (Climatised front seats)	PE91.30-P-2501-97H
		Model 293 with code 401 (Climatised front seats)	PE91.30-P-2501-97C
		Model 295, 296, 297 with code 401 (Climatised front seats)	PE91.30-P-2501-97G
	Function schematic for switching on rear seat ventilation	Model 167 with code 402 (Rear seat climate control)	PE91.30-P-2504-97A
		Model 213 as of model year 2021 with code 402 (Rear seat climate control)	PE91.30-P-2504-97B
		Model 223 with code 402 (Rear seat climate control)	PE91.30-P-2504-97C
		Model 297 with code 402 (Rear seat climate control)	PE91.30-P-2504-97D
	Further basic functions
	Seat climate control timer-controlled shutoff, basic function	Model all (CAR) with code 401 (Climatised front seats) Model all (CAR) with code 402 (Rear seat climate control)	GF91.30-P-1000A
	Seat climate control automatic shutoff, basic function	Model all (CAR) with code 401 (Climatised front seats) Model all (CAR) with code 402 (Rear seat climate control)	GF91.30-P-1001A
	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	GF91.29-P-9890A
	Seat climate control unit, basic function	Vehicles with seat ventilation and without front electrical seat adjustment	GF91.30-P-9891A
	Component descriptions
	Front seat ventilation motor component description	Model 223	GF91.30-P-5200A
		Model 243	GF91.30-P-5200B
		Model 206	GF91.30-P-5200C
	Motors for seat ventilation in rear seats, component description	Model 223	GF91.30-P-5201A