Design

Design

Damper motor module (DMM)




The damper motor module (DMM) consists of a control unit and a stepper motor. The different versions of the climate control system have up to 5 damper motor modules (DMM). These are for the different functions such as defroster and recirculation. The climate control module (CCM) communicates with the other damper motor modules (DMM) via two LIN buses, LIN bus 1 and LIN bus 2. The position of the damper motors on the LIN buses depends on whether the vehicle is left or right-hand drive.
When regulating the different dampers, the climate control module (CCM) transmits a request for a new damper position to the each damper motor module (DMM). The damper motor module (DMM) calculates and then regulates the required direction and number of steps required to obtain the requested position. The damper motor module (DMM) then transmits information to the climate control module (CCM) indicating the actual damper position and status.
When replacing the damper motor module (DMM), the new damper motor must be identified by the climate control module (CCM). This is carried out via VIDA. When replacing the damper motors, ensure that identification is carried out.
Each damper motor module (DMM) is powered via a relay in the central electronic module (CEM).
There are diagnostics for the damper motor module (DMM).

Evaporator temperature sensor (only ECC)




The evaporator temperature sensor is installed on the heater. Its role is to inform the climate control module (CCM) of the temperature of the refrigerant. The climate control module (CCM) controls the request from the evaporator temperature sensor to activate the air conditioning compressor. The evaporator temperature sensor is directly connected to the climate control module (CCM).
There are diagnostics for the evaporator temperature sensor.

Switch STC/DSTC/BLIS (-2007) (Does not apply to C70)




The switch for STC/DSTC (-2006) and BLIS (2007-) is located in the center console. The switch and its LED are directly connected to the Climate control module (CCM).
There are diagnostics for the switch.

Switch, tunnel console, front and rear (2008-)




Switch, tunnel console, available in two versions, tunnel console front (1) and tunnel console rear (2) (only C70).
Both these are keypads with room for two switches in each.
The following applies to the C70:
If the vehicle is equipped with "blind spot" warning (BLIS), and/or parking assistance (PAS), the tunnel console front, switch (1) is used to open and close the roof.
In this case, the switch is directly connected to the Convertible Roof Module (CRM) and is then not a LIN node.
Switch, tunnel console rear (2) communicates with Climate control module (CCM) via LIN communication and controls activation and deactivation of "blind spot" warning (BLIS) and/or parking assistance system (PAS).
If the vehicle is not equipped with "blind spot" warning (BLIS) or parking assistance system (PAS), there is no switch, tunnel console rear (2).
For further information, see Design and Function, Door control modules and Design and Function, Parking Assistance Module (PAM).
The following applies to the S40/V50/C30:
1.
If the vehicle is equipped with all three functions, according to below, the switch tunnel console front controls (1) activation and deactivation of the functions "dead angle"-warning (BLIS) and automatic start/stop of engine.
Switch tunnel console rear (2) controls activation and deactivation of the function parking assistance system (PAS).
The functions are:
- "dead angle"-warning (BLIS)
- parking assistance system (PAS)
- automatic start/stop of engine
2.
If the vehicle is equipped with up to two of the mentioned functions above, switch tunnel console front (1) controls activation and deactivation of these functions.
Switch, tunnel console front and rear are then connected to the Climate control module (CCM) via LIN-communication.
If the vehicle is not equipped with "dead angle"-warning (BLIS), parking assistance system (PAS) or automatic start/stop of engine, there is no switch in the tunnel console.
For more information, see Design and Function, Door modules, Design and Function, Parking Assistance Module (PAM), as well as Design and Function, Automatic start/stop of engine.

Passenger compartment temperature sensor (ECC only)




The passenger compartment temperature sensor is behind the dashboard environment panel on the left-hand side. The climate control module (CCM) (for ECC) receives the value indicating the present passenger compartment temperature from the sensor. There is also a fan on the sensor. The fan supplies the sensor with air from the passenger compartment. This prevents the value from the sensor from being distorted by heat generated by surrounding electronics.
The passenger compartment temperature sensor and fan are directly connected to the climate control module (CCM).
There are diagnostics for the passenger compartment temperature sensor and fan.
Blower fan Blower Fan
Air quality sensor (AQS) (ECC only, option)




An Air quality sensor (AQS) is available as an option for ECC. The Air quality sensor (AQS) is included with a particle filter and a humidity sensor (2008-) in a system whose main task is to ensure that the air in the passenger compartment is free of contaminants.
The task of the Air quality sensor (AQS) is to transmit signals to the Climate control module (CCM) if it registers increased amounts of contaminated outdoor air.
The air quality sensor (AQS) measures concentrations of COx and NOx.
The air quality sensor (AQS) compares the present values with previous ones and can calculate changes in pollutant concentrations. The air quality sensor (AQS) communicates with the climate control module (CCM) via a LIN bus.
The signal from the air quality sensor (AQS) to the climate control module (CCM) has four steps, 0-3:
- signal 0= no increase in or reduced pollutant level
- signal 1 = gradual increase in pollutant level
- signal 2 = medium increase in pollutant level
- signal 3 = rapid increase in pollutant level.
The climate control module (CCM) uses the signal to control the recirculation damper motor.
The air quality sensor (AQS) is under the cowl on the right-hand side of the fresh air intake.
There are diagnostics for the air quality sensor (AQS).

Humidity sensor (option, only ECC 2008-)
See Design and Function, Central electronic module (CEM).

Seat heaters




The system for the seat heaters consists of three different parts:
- a seat heating module (SHM) which controls the function for communicating with the climate control module (CCM)
- two heater pads
- a temperature sensor.
The seat heating module (SHM) is under the left and right-hand front seat. The heater pads are in the seat and backrest. The temperature sensor is in the seat.
The seat heating module (SHM) is directly connected to the heater pad and temperature sensor. The seat heating module (SHM) communicates with the climate control module (CCM) via a LIN bus.
There are diagnostics for the seat heating module (SHM).