Electronic Climate Control Module

ELECTRONIC AUTOMATIC TEMPERATURE CONTROL






System Components

With the use of a microcontroller, the Electronic Automatic Temperature Control (EATC) module analyzes input from the following major sources:
^ Temperature, function and blower selection (made by the vehicle occupants)
^ In-vehicle temperature
^ Ambient temperature
^ Sunload
^ Vehicle speed
^ Engine coolant temperature

Using these inputs, the microcontroller determines the correct conditions for the following outputs:
^ A/C clutch engagement
^ Blower speed
^ Air temperature blend door position
^ Heater air damper door position
^ Windshield defroster door position
^ Air inlet duct door position

Climate Control Assembly
The Electronic Automatic Temperature Control (EATC) module, located in the instrument panel, has the following features:
^ A blower speed override control for manual input.
^ A vacuum fluorescent display for displaying set temperature, ambient temperature, function and Diagnostic Trouble Codes (DTCs).
^ An On-Board Diagnostic (OBD) feature to supply the technician with Diagnostic Trouble Codes (DTCs). These DTCs direct the technician to the inoperative component.