#
FULL-AUTO AIR CONDITIONER FUNCTION

id074000100600

## 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 | Cabin temperature sensor
3 | Water temperature sensor
4 | Evaporator temperature sensor
5 | Solar radiation sensor
6 | Climate control unit
7 | Airflow temperature control
8 | Airflow volume control
9 | Airflow mode control
10 | Air intake control
11 | A/C compressor control
12 | Air mix actuator
13 | Power MOS FET
14 | Blower motor
15 | Airflow mode actuator
16 | Air intake actuator
17 | Refrigerant pressure switch (HI and LO pressure)
18 | Refrigerant pressure switch (middle pressure) (Triple-pressure switch)
19 | A/C cut control
20 | A/C relay
21 | Idle speed control
22 | Thermal protector
23 | Magnetic clutch

## Outline of Control System

• In the full-auto air conditioner system, the climate control unit carries out five basic types of controls based on signals from various sensors and control signals from the climate control unit. The climate control unit also has three supplementary functions.

Basic control | Control description | Correction
--- | --- | ---
Airflow temperature control | Airflow temperature automatic control | • Air intake correction • A/C correction • MAX HOT and MAX COLD correction • Coolant temperature correction • Fail-safe function
Airflow volume control | Airflow volume automatic control | • Coolant temperature correction (warm-up correction) • Mild start correction • MAX HOT and MAX COLD correction • Windshield mist prevention correction • Start compensation correction • Defroster correction • Fail-safe function
Airflow volume manual control | • Defroster correction • Fail-safe function
Airflow mode control | Airflow mode automatic control | • Ambient temperature correction (European (L.H.D. U.K.) specs.) • Engine coolant temperature correction (Warm-up correction) • Fail-safe function
Airflow mode manual control | • Fail-safe function
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 • Windshield mist prevention correction • MAX COLD correction
A/C compressor manual control | • Defroster correction • Ambient temperature correction • Windshield mist prevention correction

Supplementary function
Sensor fail-safe function
Sensor signal delay function
On-board diagnostic function

## Control Transition

### Air mix, airflow volume control

Operation switch | Air mix control | Airflow volume control
--- | --- | ---
Control before switched | Control before switched
Automatic control | Automatic control | Defroster correction | Manual control
OFF | 1 | 2 | 3 | 4 | 5 | 6 | 7
OFF switch | AUTO | OFF | OFF | OFF
AUTO switch | AUTO | AUTO | AUTO | AUTO
Fan switch | + | AUTO | MANUAL*2 | MANUAL*2 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 7
- | AUTO | MANUAL*3 | MANUAL*3 | 1 | 1 | 1 | 2 | 3 | 4 | 5 | 6
MODE switch | AUTO | AUTO | *5 | No change
DEFROSTER switch | AUTO | Defroster correction | *5 | Defroster correction
A/C switch | AUTO | AUTO | No change | No change
REC/FRESH switch | AUTO | AUTO | No change | No change
Temperature setting dial*1 | 15.0 (18.0) | MAX COLD | MAX HI | MAX HI | No change
15.5-28.5 (18.5-31.5) | AUTO | AUTO | No change | No change
29.0 (32.0) | MAX HOT | AUTO HI*4 | AUTO HI | No change

  ( ) :
Australian, General (L.H.D. R.H.D.) specs.
  *1 :
Setting temperature fluctuates up or down in increments of 0.5, within the range of 15.0 to 29.0 (European (L.H.D. U.K.) specs.) or 18.0 to 32.0 (Australian, General (L.H.D. R.H.D.) specs.). When the fan is OFF, the setting temperature can be adjusted in the range of ±1.0.
  *2 :
Goes up to the closest manual voltage to auto voltage or defroster correction voltage.
  *3 :
Goes down to the closest manual voltage to auto voltage or defroster correction voltage.
  *4 :
Coolant temperature correction takes precedence.
  *5 :
Returns to condition prior to defroster operation. However, if it is 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 before switched | Control before switched | Control before switched
Automatic control | Manual control | Automatic control | Manual control | Automatic control | Manual control
OFF switch | Condition before OFF switch ON*2 | No change*2 | Condition before OFF switch ON*2 | No change*2 | OFF | OFF
AUTO switch | AUTO | AUTO | AUTO | AUTO | AUTO | AUTO
Fan switch | + | AUTO | No change | AUTO | No change | AUTO | No change
- | AUTO | No change | AUTO | No change | AUTO | No change
MODE switch | VENT→ BI-LEVEL BI-LEVEL→ HEAT HEAT→ HEAT/DEF HEAT/DEF→ VENT DEFROSTER →HEAT | VENT→ BI-LEVEL BI-LEVEL→ HEAT HEAT→ HEAT/DEF HEAT/DEF→ VENT DEFROSTER →HEAT | AUTO | No change*2 | AUTO | No change*3
DEFROSTER switch | DEFROSTER*2 | DEFROSTER*2 | DEFROSTER correction*2 | DEFROSTER correction*2 | DEFROSTER correction*3 | DEFROSTER correction*3
A/C switch | AUTO | No change | AUTO | No change | A/C→ECO ECO→A/C OFF→A/C*4 | A/C→ECO ECO→A/C OFF→A/C*4
REC/FRESH switch | AUTO | No change | FRESH→REC REC→FRESH | FRESH→REC REC→FRESH | AUTO | No change
Temperature setting dial*1 | 15.0 (18.0) | AUTO | No change | AUTO | No change | AUTO | No change
15.5-28.5 (18.5-31.5)
29.0 (32.0)

  ( ) :
Australian, General (L.H.D. R.H.D.) specs.
  *1 :
Setting temperature fluctuates up or down in increments of 0.5, within the range of 15.0 to 29.0 (European (L.H.D. U.K.) specs.) or 18.0 to 32.0 (Australian, General (L.H.D. R.H.D.) specs.). When the fan is OFF, the setting temperature can be adjusted in the range of ±1.0.
  *2 :
If operated when in defroster correction, it returns to the condition prior to defroster operation.
  *3 :
Ambient temperature correction takes precedence. If operated when in defroster correction, it returns to the condition prior to defroster operation. However, if it is off prior to defroster operation, it switches to automatic control.
  *4 :
Ambient temperature correction takes precedence. When the fan is OFF, the A/C is fixed at off.