Control Components: Overview

Control Components

OVERVIEW
The climate control system incorporates the heating, ventilation and A/C (air conditioning) systems. There are 2 main types of climate control system available:
- a dual zone automatic system
- a dual zone automatic system with cool rear face option.
The climate control functions for both systems are controlled by the ATC (automatic temperature control) module. The ATC (automatic temperature control) module is mounted in the center console and contains both the system electronic software and user controls.
The ATC (automatic temperature control) module works in conjunction with a number of other vehicle control modules, including the ECM (engine control module), which controls a number of climate control sub-systems on receipt of requests from the ATC (automatic temperature control) module.
The dual zone climate control system features automatic control of air temperature, air distribution and blower motor speed. The ATC (automatic temperature control) module is also able to control individual temperature requests for both the driver and passenger side of the cabin.

NOTE:
The ATC (automatic temperature control) module can only maintain a maximum temperature difference between the 2 sides of the cabin of up to approximately 3°C (4°F). This is due to the movement and mix of air within the cabin.
The dual zone climate control system features a cabin temperature sensor and a sunload sensor. The cabin temperature sensor provides a temperature feedback to enable the ATC (automatic temperature control) module software maintain a constant cabin temperature. The sunload sensor provides a reading of solar loading on the vehicle occupants and enables the ATC (automatic temperature control) module to adjust the output from the climate control system accordingly.
Higher specification versions of the dual zone climate control system are also available. These systems feature 2 more additional sensors; a pollution sensor and a cabin humidity sensor.
The pollution sensor detects pollutants entering the cabin, allowing the ATC (automatic temperature control) module to react by changing the position of the air intake flap. The cabin humidity sensor calculates the probability of misting on the windshield. The ATC (automatic temperature control) module monitors the signal from the cabin humidity sensor and adjusts blower speed and air distribution.

Intake air
The ventilation system takes air from the intake grille in front of the windscreen. Always keep the air intake grille clear of obstructions such as leaves, snow or ice.

Stop/Start System
To support the Stop/Start system, a number of features are integrated into the logic and operation of the climate control system within a Stop/Start cycle to:
- maintain occupant comfort
- prevent windshield misting
- conserve battery power.
This has been achieved by the ATC (automatic temperature control) module monitoring and varying when necessary, various climate control functions within a Stop/Start cycle. For additional information, refer to Starting System
For additional information, refer to Starting System Locations
To maintain the cabin temperature when the engine is shutdown in a Stop/Start cycle, an auxiliary electric coolant-pump has also been integrated into the cooling system to maintain the coolant flow through the cabin's heater core. The pump is directly hardwired to the ECM (engine control module). On vehicles fitted with a FFH (fuel fired heater), the FFH coolant pump is utilized and activated via the FFH. For additional information, refer to Starting System
For additional information, refer to Starting System Locations