Infiniti G37 Coupe. Manual — part 767
AIR MIX DOOR CONTROL SYSTEM
HAC-57
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
AIR MIX DOOR CONTROL SYSTEM
WITHOUT LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY
CONTROL SYSTEM
WITHOUT LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CON-
TROL SYSTEM : System Diagram
INFOID:0000000001733795
WITHOUT LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CON-
TROL SYSTEM : System Description
INFOID:0000000001733796
The air mix door is automatically controlled so that in-vehicle temperature is maintained at a preset value by
the temperature setting, ambient temperature, intake temperature, in-vehicle temperature and amount of sun-
load.
SYSTEM OPERATION
• The unified meter and A/C amp. receives data from each of the sensors. The unified meter and A/C amp.
sends air mix doors, mode door and intake door opening angle data to the air mix door motor LCUs, mode
door motor LCU and intake door motor LCU.
• The air mix door motors, mode door motor and intake door motor read their respective signals according to
the address signal. Opening angle indication signals received from the unified meter and A/C amp. and each
of the motor position sensors are compared by the LCUs in each door motor with the existing decision and
opening angles. Subsequently, HOT/COLD, DEF/VENT and FRE/REC operation is selected. The new
selection data are returned to the unified meter and A/C amp.
JSIIA0774GB
HAC-58
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
AIR MIX DOOR CONTROL SYSTEM
Door Motor Circuit
Air Mix Door Control Specification
When ignition switch is ON, unified meter and A/C amp. continuously
and automatically controls temperatures regardless of air conditioner
operational condition. When setting a target temperature with tem-
perature control dial, unified meter and A/C amp. corrects the set
temperature and decides a target air mix door opening angle. Unified
meter and A/C amp. controls air mix door according to the target air
mix door opening angle and current air mix door opening angle for
keeping an optimum air mix door opening angle. When a tempera-
ture is set at 18
°
C (60
°
F), air mix door is fixed at full cold, and when
a temperature is set at 32
°
C (90
°
F), it is set at full hot.
WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CON-
TROL SYSTEM
WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL
SYSTEM : System Diagram
INFOID:0000000001733797
WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CONTROL
JSIIA0775GB
RJIA1782E
JSIIA0776GB
AIR MIX DOOR CONTROL SYSTEM
HAC-59
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
SYSTEM : System Description
INFOID:0000000001733798
The air mix doors are automatically controlled so that in-vehicle temperature is maintained at a preset value by
the temperature setting, ambient temperature, intake temperature, in-vehicle temperature and amount of sun-
load.
SYSTEM OPERATION
• The unified meter and A/C amp. receives data from each of the sensors. The unified meter and A/C amp.
sends air mix doors, mode door and intake door opening angle data to the air mix door motor LCUs, mode
door motor LCU and intake door motor LCU.
• The air mix door motors, mode door motor and intake door motor read their respective signals according to
the address signal. Opening angle indication signals received from the unified meter and A/C amp. and each
of the motor position sensors are compared by the LCUs in each door motor with the existing decision and
opening angles. Subsequently, HOT/COLD, DEF/VENT and FRE/REC operation is selected. The new
selection data are returned to the unified meter and A/C amp.
Door Motor Circuit
Air Mix Door Control Specification
When ignition switch is ON, unified meter and A/C amp. continuously
and automatically controls temperatures regardless of air conditioner
operational condition. When setting a target temperature with tem-
perature control dial, unified meter and A/C amp. corrects the set
temperature and decides a target air mix door opening angle. Unified
meter and A/C amp. controls air mix door according to the target air
mix door opening angle and current air mix door opening angle for
keeping an optimum air mix door opening angle. When a tempera-
ture is set at 18
°
C (60
°
F), air mix door is fixed at full cold, and when
a temperature is set at 32
°
C (90
°
F), it is set at full hot.
JSIIA0773GB
RJIA1782E
HAC-60
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
INTAKE DOOR CONTROL SYSTEM
INTAKE DOOR CONTROL SYSTEM
System Diagram
INFOID:0000000001733799
System Description
INFOID:0000000001733800
The intake doors are automatically controlled by the temperature setting, ambient temperature, in-vehicle tem-
perature, intake temperature, amount of sunload and ON/OFF operation of the compressor.
SYSTEM OPERATION
The intake door control judges intake door position based on the ambient temperature, the intake air tempera-
ture and the in-vehicle temperature. When shifting mode position D/F, when the DEF or OFF switches are
pressed, or when A/C switch is OFF, the unified meter and A/C amp. sets the intake door at the FRE position.
Door Motor Circuit
Intake Door Control Specification
JSIIA0777GB
JSIIA0773GB
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