System Overview

System overview

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 Signal specifications.

Signals
The table 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.