Automatic Temperature Control Module

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, CAN (controller area network) bus and LIN (local interconnect network) bus connections to allow interaction with A/C system components and other vehicle control modules.

For additional information, refer to: Communications Network

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.