MANUAL AIR CONDITIONER CONTROL SYSTEM[MZ-CD 1.6 (Y6)]

id0740b3101000


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 PJB and instrument cluster based on signals sent from the A/C switch, airflow volume control dial and evaporator temperature sensor.
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1
Airflow mode selector dial
2
A/C switch
3
Airflow volume control dial
4
Climate control unit
5
Defroster control
6
A/C compressor control
7
Air intake actuator
8
PJB and instrument cluster
9
Refrigerant pressure switch
10
A/C compressor cycling switch
11
Fan control
12
A/C cut-off control
13
A/C relay
14
Stator and thermal protector
15
Magnetic clutch
16
PTC heater


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
MAX HOT control
Climate control unit


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.

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1
Climate control unit
2
Airflow mode selector dial
3
To DEFROSTER position
4
Defroster switch
5
Wire
6
Airflow mode main link
7
FRESH signal
8
Air intake actuator
9
To FRESH position

X: Operates
–: Does not operate

Airflow mode

Air intake mode (REC switch pushed)

Defroster control
VENT
REC Û FRESH
–
BI-LEVEL
REC Û FRESH
–
HEAT
REC Û FRESH
–
HEAT/DEF
REC Û FRESH
–
DEFROSTER
FRESH
x


A/C Compressor Control

•  The climate control unit sends an A/C signal to the PCM via the PJB and instrument cluster based on signals sent from the A/C switch, airflow volume control dial and A/C compressor cycling switch.
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1
A/C signal
2
Climate control unit
3
PJB and instrument cluster
4
Output
5
A/C relay
6
Magnetic clutch
7
A/C compressor cycling switch


A/C signal on/off control

•  The climate control unit turns the A/C signal (magnetic clutch) on and off based on the refrigerant pressure detected by the A/C compressor cycling switch when the A/C switch and airflow volume control dial are on.
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1
A/C signal ON
2
A/C signal OFF
3
Operation pressure


MAX HOT control

•  The PTC heater operates when the temperature control dial is set at MAX HOT with the airflow volume control dial on. However, the PTC heater does not operate when the ambient temperature is 10 °C {50 °F} or more, or the engine coolant temperature is 70 °C {158 °F} or more.
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1
Airflow volume cntrol dial
2
Temperature control dial
3
Climate control unit
4
PJB
5
PTC heater