Design

Design

Damper motor module (DMM)




The Damper motor module (DMM) consists of a control unit and a stepper motor.
The climate control system for ECC has 5 Damper motor modules (DMM), whilst ETC has 3.
The various Damper motor modules (DMM) are for the following functions:
- defroster (only ECC)
- recirculation
- air distribution
- temperature left (only ECC)
- temperature right (only ECC)
- temperature (only ETC)
The Climate control module (CCM) communicates with the different Damper motor modules (DMM) via two LIN busses, LIN bus 1 (ECC and ETC) and LIN bus 2 (only ECC).
The positions of the damper motors on the LIN buses are determined by the system overview portion, control module in this document.
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 the diagnostic tool. 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




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.

Passenger compartment temperature sensor





Note! From and incl. structure week 201020 a new design of Climate control module (CCM) is introduced, on different vehicle models. A part of the new design is a new passenger compartment temperature sensor, which also is integrated in the control module.

The passenger compartment temperature sensor is installed on the lower right-hand side of the center console. The climate control module (CCM) 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.

Air quality sensor (AQS) (only ECC)




The air quality sensor (AQS) is, together with a particle filter and the humidity filter, part of a system which has the role of ensuring that the air in the passenger compartment is free of pollutants. The role of the air quality sensor (AQS) is to transmit a signal to the climate control module (CCM) if it detects increased concentrations of pollutants in the outside air.
The air quality sensor (AQS) measures concentrations of COx and NOx.
The climate control module (CCM) uses the signal to control the recirculation damper motor.
The air quality sensor (AQS) compares the present values with previous ones and can calculate changes in pollutant concentrations.
The Air quality sensor (AQS) is directly connected to the climate control module (CCM).
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 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 (only EEC) Description and Operation
Interior electrochromic mirror (IEC)




For internal rear view mirrors with the automatic anti-dazzle optional function, there is no manual control for anti-dazzle. The light sensor in the internal rear view mirror senses strong light from the rear and the anti-dazzle function operates automatically. The function cannot be switched off.
For internal rear view mirrors with the compass optional function, which can only be selected for rear view mirrors with anti-dazzle function, there is a display in the upper right-hand corner that shows in which direction the vehicle is pointing.
Eight different directions are indicated: N (north), NE (north east), E (east), SE (south east), S (south), SW (south west), W (west) and NW (north west).
The compass is activated automatically when the vehicle starts or when key position II is active. By pressing in the button on underneath of the internal rear view mirror, using a paper clip for example, the compass can be deactivated/activated or set.
The internal rear view mirror electronic control module (IEC) communicates with the Climate control module (CCM) via LIN bus. In the event of a fault, the Climate control module (CCM) shuts down the functions in the internal rear view mirror.
When reverse is engaged, the Climate control module (CCM) deactivates the internal rear view mirror's anti-dazzle function if it is dark. Otherwise the task of the internal rear view mirror electronic control module (IEC) is to control the integrated functions and monitor the status, as well as to transmit information to the Climate control module (CCM).

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. As an option, a Seat heating module (SHM) is also available, which is located under the left, respectively, right-hand rear seats. The heater pads are in the seat and backrest. The temperature sensor is in the seat.
The heater pad and temperature sensor are directly connected to the seat heating module (SHM). 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).

Seat ventilation (option) (only ECC)





The system for seat ventilation consists of four parts:
- a seat heating module (SHM) which controls the heater pads and the ventilation fans as well as the function for communicating with the climate control module (CCM)
- two heater pads
- a temperature sensor
- two seat fans.
The seat heating module (SHM), ventilation is located under the left and right-hand front seats. The heater pads are in the seat and backrest. The temperature sensor is in the seat. The fans, like the heater pads, are located in the seat and in the backrest. The fan speed is individually adjustable for each fan. Possible speeds are 0 to 7000 rpm.
The heater pad and temperature sensor are directly connected to the seat heating module (SHM), ventilation. The seat heating module (SHM), ventilation communicates with the climate control module (CCM) via a LIN bus.
There are diagnostics for seat heating module (SHM) ventilation left and seat heating module (SHM), ventilation right.