GF91.30-P-2001T Switch Off Seat Heater, Function

GF91.30-P-2001T Switch Off Seat Heater, Function
- with CODE (401) Front deluxe seats, including seat heating and seat ventilation
- with CODE (872) Electrically heated left and right rear seats
- with CODE (873) Heated left and right front seats

Switching off manually
Press the left front HS [SIH] switch (N72/1s10) or the right front HS [SIH] switch (N72/1s11) until the particular LEDs have gone out. On vehicles with code (872) Electrically heated left and right rear seats, press the left rear HS [SIH] switch (S51/3s2) or the right rear HS [SIH] switch (S51/4s2) until the particular LEDs have gone out. The heated seats (HS) can be switched off at any time.

Automatic switch-off via timer control
The automatic switch-of is controlled by an integrated timer in
^ the HS [SIH] and seat ventilation control unit (N25/7) (in vehicles with code (401) Front comfort seats, incl. seat heater and with code (872) Electrically heated left and right rear seats or in vehicles up to 31.5.05 with code (873) Heated left and right front seats)
^ Front passenger SAM control unit (N10/11) in vehicles as of 1.6.05 with code (873) Heated left and right front seats and without code (401) Front comfort seats, incl. seat heating and seat ventilation and without code (872) Electrically heated left and right rear seats)

The operating and function indications of the heated seats (HS) are summarized in the table given below.







The heated seats (HS) are also shut off under the following criteria:

^ Switching off after circuit 15R Off
When the ignition is switched off, the heated seats (HS) are also switched off. However, the timer control continues to run for a further 5 minutes as long as circuit 15C is on.

If circuit 15R or circuit 15 are switched on again, then the active stage is switched on again according to the timer control.

^ Switching off in the event of undervoltage
If the values are dropping below the undervoltage threshold, the heated seats HS [SIH] (loads only) are switched off (timer control continues to run). The heated seats cannot be switched on again until a permissible voltage has been present for longer than 20 seconds.

Undervoltage recognition is indicated by the fact that the particular LEDs are flashing on and off with a frequency of approx. 1.5 Hz and 50 % brightness.

^ Switching off in the event of overvoltage
When the overvoltage threshold is exceeded, the heated seats HS [SIH] (loads only) are switched off. The timer control continues to run if the heated seats (HS [SIH]) are switched off due to overvoltage. It is not possible to switch them on again until a permissible voltage is present again.

Additionally, the HS [SIH] and seat ventilation control unit (N25/7) implements the following protective mechanisms:

^ Switching off in the event of a hardware defect
If actuation of the heated cushions (R13/1, R13/2 or R13/3 and R13/4) in the driver or front passenger seat and on vehicles with code (872) Electrically heated left and right rear seats of the heated cushions (R13/5, R13/6 and R13/9 or R13/7, R13/8 and R13/10) in the left or right rear seat is recognized without a request being present, the heated seats HS [SIH] are switched off.

^ Temperature-dependent switching off of the heated rear seats HS [SIH]
If the interior temperature increases to more than 40 °C, the heated seats HS [SIH] are switched off.

If the value for the interior temperature is not available, the value of the outside temperature is used as a backup.