The ATC module is mounted in the center console and is integral with the control panel. The module works in conjunction with
the ECM to control all aspects of heating, ventilation, and A/C. An 18-pin electrical connector on the rear of the module
provides hardwired, Controller Area Network (CAN) bus and Local Interconnect Network (LIN) bus connections to allow
interaction with A/C system components and other vehicle control modules.
For additional information, refer to:
Communications Network
(418-00 Module Communications Network, Description and
Operation).
Six different ATC modules (2 single zone, 4 dual zone) are available, depending on vehicle specification. Low specification
vehicles feature 3 rotary controllers and 3 top hinged momentary switches to control the quality, temperature and distribution
of air into the cabin. High specification vehicles feature 3 rotary controllers, 6 top hinged momentary switches, and 2 dual
function momentary switches to control the quality, temperature and distribution of air into the cabin.
In addition to the A/C system, the ATC module controls operation of:
The seat heaters
The rear window heater
The windshield heater
The exterior mirror heaters.
For more information, refer to the 'Principles of Operation' section below.
COMPRESSOR SOLENOID VALVE
Item
Part Number
Description
1
-
Compressor solenoid valve
The compressor solenoid valve is integral with the A/C compressor. Operation of the solenoid valve is controlled by the ECM
using a Pulse Width Modulated (PWM) signal of differing values. By controlling the flow of refrigerant (displacement) through
the compressor, the solenoid valve can control evaporator operating temperature and cabin humidity by varying the pressure
within the A/C system.
• NOTE: The A/C compressor solenoid valve is fitted to i6 petrol vehicles only.
For additional information, refer to:
Air Conditioning
(412-01 Climate Control, Description and Operation).
REFRIGERANT PRESSURE SENSOR