Electronic Climate 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
^ panel/floor door position
^ panel/defrost door position
^ air inlet door position

Climate control Assembly
The Electronic Automatic Temperature Control (EATC) module, located in the instrument panel, has the following features:
^ 11 push buttons
^ a blower speed override thumbwheel for manual input
^ a vacuum fluorescent display for displaying set 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.

EATC System Response (Part 1 Of 2):

Electronic Automatic Temperature control System Response