LEMON Manuals: Even more car manuals for everyone
Home >> Mercedes Benz >> 2010 >> CL63 >> Repair and Diagnosis >> Restraints >> Restraints Control Systems >> Seats, Restraint Systems -- Basic Knowledge -- Cl63 >> Basic Knowledge >> Electric seat ventilation, function - GF91.30-P-0002LA

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

MODEL 216.3 

as of model year 09/YoM 08 

with CODE (401) Front comfort seats, incl. seat heater and seat ventilation 

General function requirements 

Electric seat ventilation, general 

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

IMPORTANT The status of circuit 15 is provided by the EIS [EZS] control unit (N73) via the interior CAN.

IMPORTANT During comfort opening of the vehicle, the seat ventilation of the driver seat is switched on in stage 3. If circuit 15R is not switched on at this time, the seat ventilation is switched off after t = 5 min.

More detailed information can be found in the function description for the convenience feature (CF [KFB]).

The electric seat ventilation comprises the following subfunctions:

Function sequence, switching on, over and off manually 

The seat ventilation is switched on and off and the ventilation performance regulated via the seat ventilation switch (S22s11) in the left front seat operation switch group (S22) or via the seat ventilation switch (S23s11) in the right front seat operation switch group (S23).

The electric seat ventilation is operated as follows:

Each actuation of the seat ventilation switch is read in by the left door control unit (N69/1) or right door control unit (N69/2) via the front door LIN and forwarded to the left front seat control unit (N32/1) or right front seat control unit (N32/2) via the interior CAN. The left front seat control unit then actuates the left front seat ventilation blower regulator (N29/5), or the right front seat control unit then actuates the right front seat ventilation blower regulator (N29/6).

The left front seat ventilation blower regulator actuates the following motor groups:

The right front seat ventilation blower regulator actuates the following motor groups:

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

The timer control is performed by the left front seat control unit and the right front seat control unit:

Then the system automatically switches to ventilation stage 1.

The left or right seat adjustment selection switch (S22s10) in the left front seat operation switch group can be used to switch over the functions between driver and front passenger seat adjustment. The seat ventilation is also part of the functions that can be switched over. The switchover is active for t = 10 s after pressing the seat adjustment selection switch. This status is indicated by a light-emitting diode.

If an adjustment is made during this time, the switchover remains active for another t = 10 s after the adjustment has been completed. The switchover is also terminated when the seat adjustment selection switch is pressed again.

Function sequence, automatic shutoff 

The automatic shutoff comprises the following subfunctions:

Shutting off after circuit 15R OFF: 

If circuit 15C continues to be ON, the timer control continues running for t = 5 min. If circuit 15R is switched on again, the seat ventilation is also switched on in the previously activated ventilation stage.

Shutoff in the event of undervoltage  In the event of undervoltage, the left front seat control unit or right front seat control unit switches the seat ventilation off. The timer control continues to run, the light-emitting diodes in the seat ventilation switch flash.

There is no automatic reactivation of the seat ventilation after a shutoff. If the undervoltage persists, it will no longer be possible to switch the seat ventilation on. The light-emitting diodes flash for t = 0.5 s if another request is received.

IMPORTANT It is not possible to switch the seat ventilation on again until a permissible voltage is present again.

Shutoff in the event of overvoltage 

In the event of overvoltage, the left front seat control unit or right front seat control unit switches the seat ventilation off.

The timer control continues to run if the seat ventilation is switched off due to overvoltage. The bits for the light-emitting diodes are also set accordingly.

IMPORTANT It is not possible to switch the seat ventilation on again until a permissible voltage is present again.

Switching off by on-board electrical system management system. 

In order to prevent the battery from discharging in all driving cycle phases, the state of charge is monitored continuously. Depending on the situation, the seat ventilation is also deactivated if necessary.

  Electric seat ventilation, location of components   GF91.30-P-0002-02LA 
REFER TO SYSTEM WIRING DIAGRAMS Seat ventilation electrical function schematic   PE91.30-P-2053-97CAA
  Electrical seat ventilation block diagram   GF91.30-P-0002-03LA 
  Left front seat control unit, component description N32/1 GF91.29-P-5230LE 
  Right front seat control unit, component description N32/2 GF91.29-P-5240LE 
  Left door control unit, component description N69/1 GF72.29-P-4124LA
  Right door control unit, component description N69/2 GF72.29-P-4128LA
  Component description for the EZS control unit N73 GF80.57-P-6003LE
scientia non olet · About LEMON Manuals