GF91.30-P-0003MCU Seat Heater (SIH), Function

GF91.30-P-0003MCU Seat Heater (SIH), Function
- with CODE (S17) Seat heaters (FFO)







1 Seat heater request
2 Heated cushion actuation
N25/5 Front HS [SIH] control unit
R13/1 Left seat heated cushion
R13/3 Right seat heated cushion
S6/1 Cockpit switch group
S6/1s3 Left seat heater switch
S6/1s4 Right seat heater switch

General information
With the integrated seat heater, it is possible to heat the seat cushions and backrests in two heating stages. The heated cushions are heated until they reach the defined maximum temperature. The maximum energizing time depends on the interior temperature. At level 2, the energizing takes place with a higher heat output than at level 1. The maximum temperature is therefore reached more quickly at level 2.
The function status is indicated by two light-emitting diodes that are integrated in the heated seat switches.

Operating keys and switches
^ Left seat heater switch
^ Right seat heater switch

Function requirements:
^ Circuit 15 On
^ No overvoltage or undervoltage

Switch on seat heater (2nd stage)
The 2nd stage of the seat heater is activated by a one-time actuation of the heated seat switch. At the same time, the heated seats control unit measures the interior temperature (once only) using an integrated temperature sensor.
The heated seats control unit energizes the respective heated cushion in heat-up mode at maximum output.
The duration of the actuation in heat-up mode depends on the measured interior temperature.
Then the heated cushion is actuated in continuous heating mode at 50 % of the maximum output.

Switch on seat heater (1st stage)
The 1st stage of the seat heater is activated by actuating the heated seat switch twice.
At the same time, the heated seats control unit measures the interior temperature (once only) using an integrated temperature sensor.

The heated seats control unit energizes the respective heated cushion in heat-up mode at reduced output.
The duration of the actuation in heat-up mode depends on the measured interior temperature.
Then the heated cushion is actuated in continuous heating mode at 15 % of the maximum output.

Because of the lower maximum output at level 1, the heated cushion is actuated for a longer period in heat-up mode compared to level 2.

Switch over seat heater
The heating level can be changed during the following operating conditions by pressing the heated seat switch:
^ Heat-up mode
^ Continuous heating mode

The change is from level 2 to level 1 or from level 1 to level 2 via seat heater "Off"

Changing the heating level during heat-up mode
If the heated seat switch is pressed during heat-up mode the heated cushion is actuated by the heated seats control unit with the maximum heat output for the selected heating level.
After the expiration of the heat-up period that was calculated before the heating level was changed, further actuation takes place in continuous heating mode using the selected heating level.

The timer control is not interrupted when the heating level is changed.

Changing the heating stage during continuous heating mode
^ With stage 2 activated
pressing the heated seat switch interrupts the energizing of the heated cushions for 2 minutes. Then the heated cushions are actuated in continuous heating mode at stage 1
^ With stage 1 activated
pressing the heated seat switch causes the heated cushions to be actuated for 2.5 min in heat-up mode at stage 2. Then the heated cushions are actuated in continuous heating mode at stage 2.

Switching off manually
Press heated seat switch repeatedly until the integrated light-emitting diodes go out.

After circuit 15 off the seat heater is switched off and the status when it was switched off is not saved.