System Overview

System overview

Control module




The climate control module (CCM) controls the climate control system and the buttons in the dashboard environment panel.
The climate control module (CCM) is located in the center console. There are two versions of control module (market dependent). These are:
- Electronic climate control (ECC)
- Manual climate control (MCC).
ECC is a fully automatic climate control system with air conditioning. It also allows manual settings.
MCC is a manual climate control system with air conditioning.
The climate control module (CCM) communicates with components which are directly connected and also with other control modules and components
via LIN and CAN communication.
The climate control module (CCM) communicates with the damper motors, air quality sensor (AQS) and the seat heaters via two separate LIN buses.
The number of components on the LIN buses varies, depending on the equipment level of the car (ECC/MCC and any accessories) and whether the car is
left or right-hand drive.
The following components communicate on LIN bus 1:
- the damper motor module (DMM) for air distribution
- the damper motor module (DMM) for temperature left
- the damper motor module (DMM) for recirculation (right-hand drive cars only)
- the air quality sensor (AQS) (right-hand drive cars only)
- the left-hand seat heater.
The following components communicate on LIN bus 2:
- the damper motor module (DMM) for the defroster (ECC only)
- the damper motor module (DMM) for temperature right
- the damper motor module (DMM) for recirculation (left-hand drive cars only)
- the air quality sensor (AQS) (left-hand drive cars only)
- the right-hand seat heater.
The control module checks input and output signals and carries 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.
Any diagnostic trouble codes (DTC's) are stored in the control module memory. This information can be read off using VIDA via the data link
connector (DLC) in the vehicle.
A simple method for checking that the climate control module (CCM) 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 further information, also see Signal specifications.

Signals
The table below summarizes the input signals to and output signals from the climate control module (CCM). The signal types are divided into
directly connected signals, LIN and CAN communication. The illustration below displays the same information with the Volvo component designations.