MANUAL AIR CONDITIONER CONTROL SYSTEM [MANUAL AIR CONDITIONER]SM1935309
MANUAL AIR CONDITIONER CONTROL SYSTEM [MANUAL AIR CONDITIONER]

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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 the BCM and instrument cluster based on signals sent from the A/C switch, airflow volume control dial, evaporator temperature sensor and refrigerant pressure sensor.
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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
Climate control unit


Defroster Control

1.When the airflow mode selector dial is turned to DEFROSTER, a signal is sent to the CPU.

2.A signal is sent from the CPU to the air intake actuator, the air intake mode to FRESH.

X: Operates–: Does not operate

Airflow mode

Air intake mode (REC 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 climate control unit sends an A/C signal to the PCM via the BCM and instrument cluster based on signals sent from the A/C switch, airflow volume control dial and evaporator temperature sensor.
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A/C signal on/off control

• The climate control unit 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 switch and airflow volume control dial are on. This keeps the evaporator surface temperature within the specified range, preventing the evaporator from freezing while the airflow volume control dial and A/C switch are turned on.
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