Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Automatic Temperature Control Module
The automatic temperature control (ATC) module is mounted on the end of the blower motor casing, behind the instrument panel. The automatic temperature control (ATC) module processes inputs from the TSD, the control switches located below the TSD, and the system sensors. In response to these inputs, the automatic temperature control (ATC) module outputs control signals to the air conditioning (A/C) system and the heating and ventilation system.
In addition to controlling the air conditioning (A/C) system and the heating and ventilation system, the automatic temperature control (ATC) module also controls the following:
- The seat heaters. Refer to Seats article.
- The rear window heater. Refer to Glass, Frames and Mechanisms article.
- The windshield heater. Refer to Glass, Frames and Mechanisms article.
- The exterior mirror heaters. Refer to Rear View Mirrors article.
- The steering wheel heater (if fitted). Refer to Steering Column Switches article.
Two electrical connectors provide the interface between the automatic temperature control (ATC) module, and the vehicle wiring. The automatic temperature control (ATC) module uses hardwired inputs from the system sensors, the local interconnect network (LIN) bus to communicate with the stepper motors and the medium speed controller area network (CAN) bus to communicate with other control modules on the vehicle.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.