Function
Function
Controlling the climate in the passenger compartment
For Climate control module (CCM) for ECC it is possible to use either manual settings or the AUTO function. In the latter case the control module automatically regulates heat, air conditioning, recirculation and air distribution until the selected temperature is achieved.
For Climate control module (CCM) for ETC it is only possible to use manual settings for damper position and fan speed. The control module automatically regulates heat according to the preset position so that selected temperature is achieved.
Climate control module (CCM) (4/6) regulates the following:
- Activation of the air conditioning (A/C) compressor (8/3) using a request via the controller area network (CAN) to the engine control module (ECM) (4/46)
- Controlling the damper motors, (6/48), (6/95), (6/96) (only ECC), (6/102) (only ECC) and (6/103).
- Speed of blower fan (6/28) via pulse width modulation (PWM) signal, directly connected.
The climate control module (CCM) regulates the climate in the passenger compartment based on the following input signals:
- Passenger compartment temperature, signal from the passenger compartment temperature sensor (7/10).
- Outside temperature, signal from the outside temperature sensor (6/62) via the engine control module (ECM) on the controller area network (CAN).
- Humidity sensor (7/90) (only EEC)
- The evaporator temperature, signal from the evaporator temperature sensor (7/41)
- Sun roof status, signal from the sun roof module (SRM) (4/33) via the central electronic module (CEM) over the controller area network (CAN).
- Status of the side window, signals from the driver door module (DDM) (3/126) and passenger door module (PDM) (3/127) via the controller area network (CAN)
- Status of the doors, signal from the central electronic module (CEM) via the controller area network (CAN)
- The sun intensity, signal from sun sensor (7/12) via the central electronic module (CEM). After structure week 200746, there are 2 signals, one for the right-hand side and one for the left-hand side.
- Speed, signal from the brake control module (BCM) (4/16) via the controller area network (CAN)
- Status of the windshield wipers, signal from the steering wheel module (SWM) (3/130) via the controller area network (CAN).
The climate control module (CCM) uses information about the status of the sun roof, side windows and doors to determine how it should compensate for changes in the passenger compartment temperature. If any side windows, doors or the sun roof are opened, the climate control module (CCM) will not compensate for a change in the passenger compartment temperature. Instead it maintains the same level of climate control for the compressor and blower fan (only ECC) as before.
The climate control module (CCM) (for ECC) uses the signal from the steering wheel module (SWM), indicating that the windshield wipers are on. This is to regulate the blower fan and the damper motor to remove any mist from the inside of the windshield when it rains.
For vehicles manufactured before structure week 200745, the following applies:
The climate control module (CCM) uses the signal from the sun sensor to compensate for high sun intensity. This is done by lowering the temperature of the ventilation air and for ECC, altering air distribution and increasing the speed of the blower fan.
For vehicles manufactured after structure week 200746, the following applies:
The Climate control module (CCM) for ECC registers the sun intensity on the left and right sides. Using these signals, the Climate control module (CCM) compensates for the high sun intensity.
This is done by reducing the temperature of the ventilation air on the affected side. The distribution of air is altered and the speed of the passenger compartment fan is increased.
The climate control module (CCM) uses the signal from the evaporator temperature sensor to control the activation of the air conditioning (A/C) compressor. If the signal from the evaporator temperature sensor indicates an evaporator temperature below 2-3°C, the compressor is not permitted to start because of the risk of freezing.
To maintain a constant flow of air in the passenger compartment, the climate control module (CCM) uses the speed signal from the brake control module (BCM) to regulate the speed of the blower fan. Generally, as the speed of the car increases the speed of the blower fan decreases.
At higher speeds the flow of air into the fresh air damper is adjusted.
When adjusting the climate settings manually, such as setting the temperature, this is displayed on the infotainment control module (ICM). The climate control module (CCM) transmits a signal to the infotainment control module (ICM) (3/281) via the controller area network (CAN).
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).