When the switch for the folding head restraints is activated, information is transmitted by the climate control module (CCM) (3/112) to the rear electrical module (4/58) via the Controller area network (CAN).

Folding door mirrors

When the switch for the folding door mirrors is activated, information is transmitted by the climate control module (CCM) to the driver's door module (3/126) and the passenger door module (PDM) (3/127) via the Controller area network (CAN).

Bi-fuel

When the bi-fuel switch is activated, a signal is transmitted from the climate control module (CCM) to the engine control module (ECM) (4/46) on the Controller area network (CAN) via the central electronic module (CEM). The engine control module (ECM) transmits a signal to the climate control module (CCM) about the type of fuel being used. The climate control module (CCM) uses this signal to light / turn off the LED on the switch.

HINT: This section will first be accessible during 2003.

Valet lock / child-proof lock

When activating the valet lock switch or the child lock switch information is transmitted to the rear electronic module (REM) via the Controller area network (CAN).

For further information, see System description/Design and Function .

STC or DSTC

When the STC or DSTC switch is activated, a signal is transmitted from the climate control module (CCM) to the brake control module (BCM) (previously ABS) (4/16) via the Controller area network (CAN). The brake control module (BCM) transmits a signal to the climate control module (CCM) about whether the STC or DSTC functions are operating. The climate control module (CCM) uses this signal to light / turn off the LED on the switch.

For further information, see BRAKE CONTROL SYSTEM - DESIGN AND FUNCTION .

Auxiliary lamps

When the auxiliary lamps switch is activated, information is transmitted from the climate control module (CCM) to the central electronic module (CEM). The central electronic module (CEM) transmits a signal to the climate control module (CCM) about whether the auxiliary lamps are on or not. The climate control module (CCM) uses this information to light / turn off the LED on the switch

Reduced alarm

When activating the reduced alarm switch information is transmitted via the Controller area network (CAN) to the upper electronic module (UEM) and rear electronic module (REM).

For further information, see ALARM, IMMOBILIZER, AND VOLVO ON-CALL - DESIGN AND FUNCTION .

Rear A/C

When activating the switch for rear A/C information is transmitted via the Controller area network (CAN) to the rear electronic module (REM). From this signal and the signal from the engine control module (ECM) indicating whether the engine is running or not, the rear electronic module (REM) will activate/deactivate the relay supply to the rear A/C system. The rear electronic module (REM) transmits a signal indicating whether the rear A/C is on or not to the climate control module (CCM) via the control area network (CAN). The climate control module (CCM) uses this information to light / turn off the LED in the switch.

Scheme 282

Scheme 282: Control module

The climate control module controls the climate control system and the buttons in the dashboard environment panel.

The climate control module is located in the center console. There are three versions of control module (market dependent). These are

Electronic Climate Control. This fully automatic climate control system has air conditioning and the option of manual settings
Manual Climate Control. A manual climate control system with air conditioning
Standard Heater. A manual climate control system without air conditioning.

The climate control module (for the electronic climate control and manual climate control) obtains the current passenger compartment temperature from a sensor integrated into the control module.

The intensity of the dashboard lighting is regulated based on a signal from the twilight sensor. The twilight sensor is located at the front of the dashboard environment panel under the button for air distribution to the floor.

The climate control module communicates with components which are directly connected and with other control modules and also with components via serial communication and Control area network (CAN).

The control module checks input and output signals and carried out activations via an integrated diagnostic system. A diagnostic trouble code (DTC) is stored if the control module detects an error. In certain cases the control module replaces the faulty signal with a substitute value.

Diagnostic trouble codes (DTC) are stored in the control module memory. This information can be read off using the diagnostic tool via the data link connector (DLC) in the car.

A simple method for checking that the climate control module has a power supply and is grounded is to increase or decrease the blower fan speed. Another method is to activate one of the functions controlled by the buttons on the dashboard environment panel.

For information, see Signals .

The chart below summarizes input and output signals to and from the climate control module. The signal types are divided into directly connected signals, serial communication and Controller area network (CAN) communication. The illustration below displays the same information with the Volvo component designations.

Input signals	Output signals
Directly connected: Sun sensor (7/12), (ECC)	Directly connected: Blower fan motor (6/28), control signal
Blower fan motor (6/28), diagnostic signal	Damper motors for electronic climate control (6/48, 6/95-96, 6/102-103), control signal
Evaporator temperature sensor (7/41), control signal	Damper motors for manual climate control (6/48, 6/69, 6/95-96), control signal
Air quality sensor (7/159), (ECC, option)	Sun sensor (7/12), (ECC)
Via Controller Area Network (CAN)	Via Controller Area Network (CAN)
The central electronic module (CEM) (4/56)	The central electronic module (CEM) (4/56)
The engine control module (ECM) (4/46)	Driver's door module (DDM) (3/126)
Rear electronic module (4/58)	Passenger door module (3/127)
Brake control module (ABS-control module) (4/16)	Brake control module (ABS-control module) (4/16)
Driver's door module (DDM) (3/126)	Rear electronic module (4/58)
Passenger door module (3/127)	The engine control module (ECM) (4/46)
Upper electronic module (4/70)
Steering wheel module (3/130)

Scheme 283

Scheme 284

Scheme 284: Climate control unit

The climate control unit consists of the following components

Heater element
Damper motor module (DMM), temperature left
Blower fan
Damper motor module (DMM), fresh air/recirculation
Power unit for blower fan motor
Particle filter
Damper motor module, ventilation and floor (also defroster for MCC)
Damper motor module (DMM), temperature right
Damper motor module (DMM), defroster (ECC).

Engine coolant constantly flows through the heater element. There is no valve to regulate the flow. The selected temperature is achieved using dampers for the right and left-hand sides of the car installed upstream and downstream of the heater element. These control the amount of air to be warmed. There are also dampers downstream of the heater element that guide the airflow to the correct air vent.

The climate control module provides infinitely variable electronic blower fan control. When AUTO mode (ECC only) is engaged the climate control module (CCM) adapts the blower fan speed to the setting of the controls and the vehicle speed. The blower fan can be set to run-on in order to reduce residual moisture in the evaporator (the function is not available for vehicle's with engine B8444S).

A timer located in the central electronic module (CEM) controls the run-on time. 50 minutes after the engine has been switched off and the ignition has been turned to position 0 or I, the central electronic module (CEM) supplies power to the climate control module (CCM) and the blower fan is activated at full speed for 7 minutes. This run-on dries the evaporator and prevents bad odors.

This function is programmed at the factory, but can be deactivated in the event of customer complaints via programming of customer parameters. Programming is carried out via VIDA.

Scheme 285

Scheme 285: 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).

Switch functions, dashboard environment panel, (lower section) Volvo V70 II рестайлинг