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6.Air Conditioning ECUThe following table is a comparison of the air conditioning ECU functions between the new and previousmodel.SystemFunctionNewPreviousCalculation ofRequired Outlet AirTemperatureCalculates the required outlet air temperature based onthe set temperature, room air temperature, ambient airtemperature and solar radiation.Temperature ControlTo drive the air mix servomotor in accordance with therequired outlet air temperature, the air temperaturepassed through the evaporator and the engine coolanttemperature and to control the outlet air temperature(Air Mix Damper Control).Sets the blower speed according to operation of theblower switch (Manual Control).(5-step)(5-step)Blower ControlWhen the automatic control or front defroster switch isturned on, the blower starts. Then the blower speedthat is appropriate for the required outlet airtemperatureis compared with the blower speed that is appropriatefor solar radiation, and the blower is controlled with thefaster speed of the above two speeds (AutomaticControl). However, when the coolant temperature isbelow a predetermined level and the air outlet is in the“foot” or “bi-level” mode, the blower will not operate(Warm-Up Control).
100BODY ELECTRICAL — AIR CONDITIONINGSystemFunctionNewPreviousBlower ControlWhen the air outlet mode is at “face” or “bi-level” andthe required outlet air temperature is below apredetermined level, the blower is set to operate after atime lag in order to prevent hot air from being blownout suddenly right after the engine is started(Time-Lagged Air Flow Control).Drives the air inlet servomotor according to theoperation of the air inlet control switch and fixes thedampers in the “fresh” or “recirc.” position (ManualControl).Air inlet ControlSwitches the damper position between “fresh”, “freshand recirc. mix” or “recirc.” according to the requiredoutlet air temperature (Automatic Control).Fixes the damper position on “fresh” if the frontdefroster switch is turned on during automatic control(Forced Fresh Air Intake Control).Drives the air outlet step motor in accordance with theoperation of the mode select and front defrosterswitches and fixes the dampers in the “face”, “bi-level”,“foot”, “foot and def.” or “def.” position (ManualControl).Air Outlet ControlSwitches the damper position between “face”,“bi-level” of “foot” according to the required outlet airtemperature (Automatic Control)If the blower is under warm-up control when the airoutlet mode is in “bi-level” or “foot” mode, the LCDdisplay remains as it is while the air outlet step motor isdriven and the dampers are switched to the “def.”position, preventing cool air from leaking from the footvent (Def.-Foot Control).
101BODY ELECTRICAL — AIR CONDITIONINGSystemFunctionNewPreviousIf the A/C switch is switched on while the blower isturned on, this turns on the magnetic clutch relay andoperates the compressor (Manual Control).