CONTROL SYSTEM FUNCTION [MANUAL AIR CONDITIONER]

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Outline of Control System

• Manual air conditioner defroster control and A/C compressor control.


Control name	Control part
Defroster control	Climate control unit
A/C compressor control	Center panel

Defroster Control

1. When the airflow mode selector dial is turned to DEFROSTER position, a wire moves the airflow mode main link, turning the airflow mode to DEFROSTER.

2. The defroster switch turns on at the same time, and the CPU sends a signal to turn the air intake mode to FRESH.

3. The air intake actuator operates and turns the air intake mode to FRESH.

X: Operates

-: Does not operate


Airflow mode	Air intake mode (REC/FRESH switch pushed)	Defroster control
VENT	REC ⇔ FRESH	-
BI-LEVEL	REC ⇔ FRESH	-
HEAT	REC ⇔ FRESH	-
HEAT/DEF	REC ⇔ FRESH	-
DEFROSTER	FRESH	x

A/C Compressor Control

• The center panel sends an A/C signal to the PCM via the refrigerant pressure switch based on signals sent from the A/C switch, fan switch and evaporator temperature sensor.

• The PCM controls the A/C relay and IAC valve based on the input signal from the center panel.

A/C signal on/off control

• The center panel turns the A/C signal (magnetic clutch) on and off based on the temperature of the air passing through the evaporator when the A/C and fan switches are on. This keeps the evaporator surface temperature within the specified range, preventing the evaporator from freezing while the fan switch and A/C switch are turned on.