Electronic Automatic Temperature Control (EATC) System: Notes

The dual-zone electronic automatic temperature control (EATC) system maintains the selected vehicle interior temperature by heating and/or cooling the air.

• During A/C operation the system also reduces the relative humidity of the air.
• The driver may override the automatic mode of operation.
• The temperature control setting determines the desired air temperature.
• The blower motor control override buttons vary the blower motor speed.
• The driver side and passenger side temperature settings can be individually controlled.

The EATC system operation is determined by the settings on the EATC module. The EATC system automatically maintains a selected temperature for vehicle interior comfort. The EATC system is composed of the EATC module, blower motor speed control, mode door actuator, air inlet door actuator, temperature blend door actuator, in-vehicle temperature sensor, ambient temperature sensor, evaporator temperature sensor and solar radiation sensor to control the various functions.

When the EATC module is set to AUTO:

• the air distribution direction, blower motor speed and A/C compressor operation are automatically controlled based on the temperature(s) selected.

The EATC module manual override settings:

• allow the air distribution direction to be manually selected.
• allow the blower motor speed to be manually selected.
• allow recirculation mode to be manually selected in all modes except DEFROST. The A/C request can be cancelled by pressing the A/C request switch, turning the indicator OFF.
• allow A/C compressor operation to be manually selected except in DEFROST.

The EATC module also includes:

• a rear window DEFROST button. Refer to GLASS, FRAMES AND MECHANISMS article.
• heated seat controls. Refer to SEATING article.