Electric seat ventilation, function - GF91.30-P-0002GZ

MODEL 164, 251 with CODE (401) Front deluxe seats, incl. seat heating and seat ventilation up to Model Year 8

Fig 1: Electric Seat Ventilation Function Diagram

Courtesy of MERCEDES-BENZ USA

Shown on model 164.8

Function

The seat ventilation integrated into the driver/front passenger seat enables the seat cushions and the backrests to be ventilated in three ventilation stages.

The seat ventilation switch in the upper control panel control unit (N72/1) can be used to switch the seat ventilation on and off or to regulate ventilation output.

Each actuation of the seat ventilation switch is read in by the upper control panel control unit and sent over the interior CAN to the HS [SIH], seat ventilation and steering wheel heater control unit. This then actuates the respective blower regulator. The blower regulators in turn then actuate the respective motor groups with the desired seat ventilation output.

Function requirements:

C. 15R On

Switching seat ventilation on and over

Feedback of the set ventilation output is provided via three blue LEDs in the seat ventilation switch.

Operating the seat ventilation switch once activates stage 3 of the seat ventilation. All 3 LEDs in the seat ventilation switch are actuated.
Operating the seat ventilation switch again switches over to stage 2. 2 LEDs are actuated in the seat ventilation switch.
Operating the seat ventilation switch again switches over to stage 1. 1 LED is actuated in the seat ventilation switch.

During comfort opening with the transmitter key (A8/1) (infrared signal), the seat ventilation of the driver seat is switched on in stage 3 for 5 min.

Manual seat ventilation cutout

Seat ventilation can be switched off manually by operating the seat ventilation switch.

To this end, the respective seat ventilation switch must be repeatedly actuated until the LEDs are all off.

Switching the seat ventilation on, over or off by operating the respective seat ventilation switch is possible at any given time.

Automatic seat ventilation switch-off

Switching off as under terminal 15R OFF

If circuit 15C remains On, the timer control runs for another 5 min. If circuit 15R is switched on again, then the seat ventilation is also switched on at the stage active according to the timer control.

Switching off in the event of undervoltage

The timer control continues to run if the seat ventilation is switched off due to undervoltage. The LEDs in the switches flash on and off while undervoltage is applied.

Seat ventilation is automatically switched off if one of the following criteria is fulfilled:

Switching off in the event of overvoltage

The timer control continues to run if the seat ventilation is switched off due to overvoltage.

	Electric seat ventilation, location of components		GF91.30-P-0002-02GZ
	Electrical seat ventilation block diagram		GF91.30-P-0002-03GZ