Electronic Automatic Temperature Control (EATC): Notes

The HVAC module analyzes input from the following major sources:

• Temperature, airflow direction, blower, A/C and RECIRC selection (made by the vehicle occupants)
• In-vehicle temperature sensor (non-hybrid)
• In-vehicle temperature and humidity sensor (hybrid)
• Ambient air temperature sensor
• Solar radiation sensor (sunload sensor)
• Vehicle speed
• Engine coolant temperature
• Occupant Classification Sensor (OCS) (hybrid only)

Using these inputs, the HVAC module determines the correct conditions for the following outputs:

• A/C compressor operation
• Blower motor speed
• RH and LH temperature blend door positions
• DEFROST/PANEL/FLOOR airflow mode door position
• Air inlet mode door position