MANUAL AIR CONDITIONER CONTROL SYSTEM [MANUAL AIR CONDITIONER]
id0740a2101000
Block Diagram
• The climate control unit performs the defroster control based on the signal sent from the airflow mode selector dial, and sends an operating signal to the air intake actuator.
• The climate control unit sends an A/C signal to the PCM via instrument cluster based on signals sent from the A/C switch, airflow volume control dial, and evaporator temperature sensor.
Outline of Control System
• Manual air conditioner defroster control and A/C compressor control.
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Control name
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Control part
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A/C compressor control
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Climate control unit
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Defroster control
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Climate control unit
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A/C Compressor Control
• The climate control unit sends an A/C signal to the instrument cluster based on signals sent from the A/C switch, airflow volume control dial, and evaporator temperature sensor.
A/C signal on/off control
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• To prevent the evaporator being frozen while the A/C is on (A/C and fan switches are on), the PCM switches the A/C signal on/off (on/off of the magnetic clutch) based on the temperature signal from the evaporator temperature sensor so that the temperature of the air passing through the evaporator is within a certain range.
Defroster control
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• To improve defrosting when the climate control unit airflow mode dial is turned to DEFROSTER position, the defroster control switches air intake to FRESH mode.
