Infiniti G35 (V35) Sedan. Manual — part 771
HAC-56
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
DIAGNOSIS SYSTEM (AUTO AMP.)
CONSULT-III APPLICATION ITEMS
CONSULT-III can display each diagnosis item using the diagnosis test modes shown following.
DATA MONITOR
Display Item List
System part
Check item, diagnosis mode
Description
ECM
Data monitor
Displays ECM input data in real time.
Monitor Item
Condition
Value/Status
IGN ON SW
Ignition switch OFF
→
ON
OFF
→
ON
FAN ON SIG
Ignition switch ON
Blower fan motor switch ON
ON
Blower fan motor switch OFF
OFF
AIR COND SW
Ignition switch ON
Compressor ON
ON
Compressor OFF
OFF
REFRIGERANT PRESSURE
SENSOR
• Engine is running
• Warm-up condition
• Both A/C switch and blower fan motor switch: ON (Compressor
operates)
1.0 - 4.0 V
MODE 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
MODE DOOR CONTROL SYSTEM
Description
INFOID:0000000000959921
SYSTEM DESCRIPTION
Component Parts
Mode door control system components are:
• Unified meter and A/C amp.
• Mode door motor (LCU)
• A/C LAN system (PBR built-in mode door motor, air mix door motor and intake door motor)
• In-vehicle sensor
• Ambient sensor
• Sunload sensor
• Intake sensor
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 door, mode door and intake door opening angle data to the air
mix door motor LCU(s), mode door motor LCU and intake door motor LCU.
• The air mix door motor(s), 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.
JSIIA0131GB
HAC-58
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MODE DOOR CONTROL SYSTEM
LAN System Circuit
Mode Door Control Specification
Mode position can be selected manually by pressing MODE switch
or DEF switch of the preset switch. This enables to fix a mode posi-
tion. Automatic control by unified meter and A/C amp. Pressing
AUTO switch allows automatic control by unified meter and A/C
amp. During the automatic control of mode position, a mode door
position (VENT, B/L, FOOT, or D/F) is selected based on a target air
mix door opening angle and sunload depending on a temperature
calculated by unified meter and A/C amp. In addition, D/F is selected
to prevent windshield fogging only when ambient temperature is
extremely low with mode position FOOT.
JSIIA0098GB
RJIA1778E
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
AIR MIX DOOR CONTROL SYSTEM
WITHOUT LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY
CONTROL SYSTEM
WITHOUT LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CON-
TROL SYSTEM : Description
INFOID:0000000000959922
SYSTEM DESCRIPTION
Component Parts
Air mix door control system components are:
• Unified meter and A/C amp.
• Air mix door motor (LCU)
• A/C LAN system (PBR built-in mode door motor, air mix door motor and intake door motor)
• In-vehicle sensor
• Ambient sensor
• Sunload sensor
• Intake sensor
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 open-
ing 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.
JSIIA0132GB
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