FULL-AUTO AIR CONDITIONER FUNCTION

B3E074000116T02

Block Diagram

• The control system consists of input components (sensors), output components (actuators, magnetic clutch, power MOS FET, and other parts), and a control device (climate control unit).

1
Ambient temperature sensor
2
ECT sensor
3
Evaporator temperature sensor
4
Cabin temperature sensor
5
Solar radiation sensor
6
Main fuse block
7
Climate control unit
8
Airflow temperature control
9
Airflow volume control
10
Airflow mode control
11
Air intake control
12
A/C compressor control
13
Air mix actuator
14
Power MOS FET
15
Blower motor
16
Airflow mode actuator
17
Air intake actuator
18
Refrigerant pressure switch
19
HI and LO pressure
20
Medium-pressure
21
A/C cut control
22
A/C relay
23
Stator and thermal protector
24
Magnetic clutch
25
Idle speed control
26
IAC valve

Control Table

• The full-auto air conditioner system functions based on the five basic types of controls and three supplementary functions.

Basic control

Control description

Correction control

Airflow temperature control
Airflow temperature automatic control
• Air intake correction
• A/C correction
• MAX HOT and MAX COLD correction
• Engine coolant temperature correction
Airflow volume control
Airflow volume automatic control
• Engine coolant temperature correction (warm-up correction)
• Vehicle speed correction
• Mild start correction
• MAX HOT and MAX COLD correction
• Window fogging prevention correction at start
• Starting compensation correction
• Defroster correction
• Starting burnt-out prevention function
Airflow volume manual control
• Defroster correction
• Starting burnt-out prevention function
Airflow mode control
Airflow mode automatic control
• Ambient temperature correction
• Engine coolant temperature correction (warm-up correction)
Airflow mode manual control
 
Air intake control
Air intake automatic control
• MAX COLD correction
• Defroster correction
• Ambient temperature correction
• A/C OFF correction
Air intake manual control
• Defroster correction
A/C compressor control
A/C compressor automatic control
• Defroster correction
• Ambient temperature correction
• MAX COLD correction
• Window fogging prevention correction at start
A/C compressor manual control
• Defroster correction
• Ambient temperature correction
• Window fogging prevention correction at start

Supplementary function

Fail-safe function
Sensor signal delay function
On-board diagnostic function

Control Type Transition by Switch Operation

Airflow temperature control, airflow volume control

Operation switch

Airflow temperature control

Airflow volume control

Control prior to switch operation

Control prior to switch operation

Automatic control

Automatic control

Defroster correction

Manual control

OFF

1

2

3

4

5

6

7

OFF switch
Automatic control
OFF
OFF
OFF
AUTO switch
Automatic control
Automatic control
Automatic control
Automatic control
Fan switch
+
Automatic control
Manual control*2
Manual control*2
1
2
3
4
5
6
7
7
-
Automatic control
Manual control*3
Manual control*3
1
1
1
2
3
4
5
6
MODE switch
Automatic control
Automatic control

*5

No change
DEFROSTER switch
Automatic control
Defroster correction

*5

Defroster correction
A/C switch
Automatic control
Automatic control
No change
No change
REC/FRESH switch
Automatic control
Automatic control
No change
No change
Temperature setting dial*1
15.0
MAX COLD
MAX HI
MAX HI
No change
15.5-28.5
Automatic control
Automatic control
No change
No change
29.0
MAX HOT
AUTO HI*4
AUTO HI
No change

*1 :
Adjusted up or down in increments of 0.5 within a range of 15.0-29.0. When the fan is OFF, the temperature setting can be adjusted in increments of ±1.0.
*2 :
Increases to the manual voltage that is closest to the auto or defroster correction voltage.
*3 :
Decreases to the manual voltage that is closest to the auto or defroster correction voltage.
*4 :
Engine coolant temperature correction takes precedence.
*5 :
Returns to condition prior to defroster operation. However, if it had been off prior to defroster operation, it switches to automatic control.

Airflow mode control, air intake control, A/C compressor control

Operation switch

Airflow mode control

Air intake control

A/C compressor control

Control prior to switch operation

Control prior to switch operation

Control prior to switch operation

Automatic control

Manual control

Automatic control

Manual control

Automatic control

Manual control

OFF switch
Fixed at mode before turned OFF*2
No change*2
Fixed at mode before turned OFF*2
No change*2
OFF
OFF
AUTO switch
Automatic control
Automatic control
Automatic control
Automatic control
Automatic control
Automatic control
Fan switch
+
Automatic control
No change
Automatic control
No change
Automatic control
No change
-
Automatic control
No change
Automatic control
No change
Automatic control
No change
Mode switch
VENTBILEVEL
BILEVELHEAT
HEATHEAT/DEF
HEAT/DEFVENT
DEFROSTERHEAT
VENTBILEVEL
BILEVELHEAT
HEATHEAT/DEF
HEAT/DEFVENT
DEFROSTERHEAT
Automatic control
No change*2
Automatic control
DEFROSTER*3
DEFROSTER switch
DEFROSTER*2
DEFROSTER*2
Defroster correction*2
Defroster correction*2
Defroster correction*3
Defroster correction*3
A/C switch
Automatic control
No change
Automatic control
No change
A/COFF
OFFA/C*4
A/COFF
OFFA/C*4
REC/FRESH switch
Automatic control
No change
FRESHREC
RECFRESH
FRESHREC
RECFRESH
Automatic control
No change
Temperature setting dial*1
15.0
Automatic control
No change
Automatic control
No change
Automatic control
No change
15.5-28.5
Automatic control
No change
Automatic control
No change
Automatic control
No change
29.0
Automatic control
No change
Automatic control
No change
Automatic control
No change

*1 :
Adjusted up or down in increments of 0.5 within a range of 15.0-29.0. When the fan is OFF, the temperature setting can be adjusted in increments of ±1.0.
*2 :
If operated during defroster correction, it returns to the condition prior to defroster operation.
*3 :
Ambient temperature correction takes precedence. If operated during defroster correction, it returns to the condition prior to defroster operation. However, if it had been off prior to defroster operation, it switches to automatic control.
*4 :
Ambient temperature correction takes precedence. When the fan is OFF, it is fixed at A/C OFF.