Infiniti EX35. Manual — part 912
HAC-44
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
CAN COMMUNICATION SYSTEM
CAN COMMUNICATION SYSTEM
System Description
INFOID:0000000003545584
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only. For details, refer to
MODE DOOR CONTROL SYSTEM
HAC-45
< 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
System Diagram
INFOID:0000000003545589
System Description
INFOID:0000000003545590
The mode door is automatically controlled by the temperature setting, ambient temperature, in-vehicle temper-
ature, intake temperature and amount of sunload.
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.
Door Motor Circuit
Mode Door Control Specification
JSIIA0772GB
JSIIA0880GB
HAC-46
< FUNCTION DIAGNOSIS >
[AUTOMATIC AIR CONDITIONER]
MODE DOOR CONTROL SYSTEM
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.
RJIA1778E
AIR MIX DOOR CONTROL SYSTEM
HAC-47
< 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:0000000003545591
WITHOUT LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CON-
TROL SYSTEM : System Description
INFOID:0000000003545592
The air mix door is automatically controlled so that in-vehicle temperature is maintained at a predetermined
value by the temperature setting, ambient temperature, in-vehicle temperature and amount of sunload.
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
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