Function
Function
Controlling the climate in the passenger compartment Controlling the Climate In the Passenger Compartment
Controlling the seat climate
Note! Depending on vehicle model, structure week, and which options have been selected, the functions below are available in different combinations.
The seat heaters for the front seats are activated using the switches on the climate control module (CCM) (4/6). The rear seats are activated using the rear seat heaters switch. The function is normally switched off. There are three different temperature settings. When the seat heaters are activated, the highest temperature is preset. On or two further presses of the button then reduce the temperature by one or two settings respectively. The status of the indication is displayed via LEDs. The climate control module (CCM) transmits information about the selected temperature to the relevant seat heating module (SHM) on the relevant LIN bus. The seat heating module (SHM) then controls the current to the heater pads. Each control module then transmits its present status to the climate control module (CCM).
Communication between the climate control module (CCM) and each seat module takes place in the following way:
LIN bus 1:
- the Seat heating module (SHM) left, front (ECC and ETC) or ventilation left (9/12) (only ECC)
- at heating module (SHM), left rear (9/14) (option)
LIN bus 2:
- the Seat heating module (SHM) right, front (ECC and ETC) or ventilation right (9/13) (only ECC)
- seat heating module (SHM), right rear (9/15) (option)
The climate control module (CCM) receives information from the central electronic module (CEM) (4/56) about the type of seat and upholstery via the controller area network (CAN). The levels for high and low temperature are adapted for the relevant seat and upholstery by the climate control module (CCM). To a certain extent, the levels for high and low temperature can be adapted to the wishes of the customer using the diagnostic tool.
Depending on vehicle model and options selected by customers, seat ventilation may be found. This as well can be customized using the diagnostics tool. The same applies to the time during which seat heating shall be activated after being turned on.
Recirculation control (ECC)
Climate control module (CCM) (4/6) controls recirculation under the following conditions:
- the recirculation switch is on (the LED lights orange)
- the system is in AUTO mode and there is a large difference between the desired and current temperature
- the car is equipped with an air quality sensor (AQS), and the recirculation switch is on (the LED lights green).
The air quality sensor (AQS) (7/159) transmits a signal to the climate control module (CCM) if it detects raised concentrations of pollutants in the outside air. When this occurs, the climate control module (CCM) transmits a signal to the damper motor for recirculation (6/48) to close the fresh air damper and to use recirculated air.
The degree of recirculation is controlled by the signal from the air quality sensor (AQS):
- signal 1 provides partial recirculation for speeds below 85 km/h, no recirculation for speeds exceeding 85 km/h
- signals 2 and 3 provide 100% recirculation.
If the high level of pollutants remains, the system stays in recirculation for a certain time, maximum of 10 minutes. The time that the system is recirculating is determined by the outside temperature, whether the air conditioning (A/C) is on or if the windshield wipers are activated. The system returns to fresh air for a short time before recirculation is resumed. The particle filter absorbs most of the pollutants entering the passenger compartment during this time. The maximum time prevents misting and musty air.
The air quality sensor (AQS) transmits information about the content of pollutants to the climate control module (CCM). This information is graded into four levels, and the information used for diagnosis.
Recirculation is never permitted if defroster is selected. The climate control module (CCM) also requests compressor activation when the evaporator temperature exceeds 3 °C.
Recirculation control (ETC)
Climate control module (CCM) (4/6) controls recirculation under the following conditions:
- the recirculation switch is on (the LED lights orange)
Recirculation is never permitted if defroster is selected. The climate control module (CCM) also requests compressor activation when the evaporator temperature exceeds 3 °C.
Heated rear windshield and door mirrors
The heated rear windshield and door mirrors are activated by pressing the switch on the climate control module (CCM) (4/6). The climate control module (CCM) transmits information via the controller area network (CAN) indicating the status of the electrical heating to the following:
- central electronic module (CEM) (4/56)
- driver door module (DDM) (3/126)
- passenger door module (PDM) (3/127).
For further information, see Design and Function, driver door module (DDM)/passenger door module (PDM) and Design and Function, central electronic module (CEM).
Switches on the keypad
Climate control module (CCM) is available in two versions from and incl. structure week 201020. The keypads' design differ but can, in principle, in both cases be divided into three parts.
The switches on the lower part of the keypad control optional functions such as "Lane Departure Warning" and active safety. On the latter version of Climate control module (CCM) the switches for optional functions are in turn divided in two groups: the first consists of the three middle switches (A), which are replaceable; the second group consists of the three surrounding switches (B), which are fixed.
Above the switches for optional functions, in the middle of the keypad, are switches that affect functions in Climate control module (CCM) (4/6), for example:
- climate control
- activation of the seat heaters
- etc.
The keypad's top group of switches concerns functions for the Infotainment system. When activating of these switches Climate control module (CCM) sends a signal to Infotainment control module (ICM) (3/281) via the CAN-net.
When activating switches on the keypad the Climate control module (CCM) will activate light-emitting diodes even if the function for some reason should not be available.
For more information, see Design and Function - Infotainment control module (ICM).