Control Assembly: Description and Operation

CONTROL SYSTEM INPUTS - ELECTRONIC MANUAL TEMPERATURE CONTROL

EMTC Module (climate Control Assembly)
The climate control assembly integrates the temperature control, mode function selection, A/C request button, recirculated air request button and rear defog button into a single unit.

The temperature control switch setting determines air temperature. Movement of the temperature knob from COOL (blue) to WARM (red) causes a corresponding movement of the temperature blend door and determines the air discharge temperature that the air distribution system will maintain. The temperature control switch is an integral part of the climate control assembly and cannot be installed separately.

The A/C request button determines A/C compressor operation, except when the function selected is OFF, MAX A/C, DEFROST, or FLOOR/DEFROST. The A/C request button an integral part of the climate control assembly and cannot be installed separately.

The recirculated air request button can select recirculated air in any mode except MAX A/C, OFF or DEFROST.

The rear defog button (if equipped) signals activation of the heated backlight and heated exterior rear view mirrors. The rear defog button is an integral part of the climate control assembly and cannot be installed separately.

The heated mirror button (if equipped) signals activation of the heated exterior rear view mirrors. The heated mirror button is an integral part of the climate control assembly and cannot be installed separately.

The EMTC module is not equipped with self-test capabilities.

CONTROL SYSTEM INPUTS - ELECTRONIC AUTOMATIC TEMPERATURE CONTROL

EATC Module (climate Control Assembly)
The EATC module provides an interface for the vehicle occupants to control the climate control system, or automatically controls the climate control system in the AUTO mode. The EATC module has a vacuum fluorescent display for displaying set temperature, airflow direction, blower speed and diagnostic trouble codes (DTCs). An on-board diagnostic (OBD) feature is incorporated to supply the technician with diagnostic trouble codes (DTCs). These DTCs help direct the technician to the inoperative component.

The EATC module display will switch between Celsius and Fahrenheit when the instrument cluster display is toggled.

Steering Wheel Audio/Climate Control Switch
The steering wheel audio/climate control switch allows the driver to adjust the passenger compartment temperature setting and manually override the blower motor speed setting.