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Infiniti FX35, FX50 (S51). Manual - part 1162

CAN COMMUNICATION SYSTEM

HAC-45

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

HAC

CAN COMMUNICATION SYSTEM

System Description

INFOID:0000000005246230

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

LAN-29,

"CAN System Specification Chart"

HAC-46

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

MODE DOOR CONTROL SYSTEM

MODE DOOR CONTROL SYSTEM

System Diagram

INFOID:0000000005246231

System Description

INFOID:0000000005246232

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 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

• 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

MODE DOOR CONTROL SYSTEM

HAC-47

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

HAC

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

HAC-48

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONER]

AIR MIX DOOR CONTROL SYSTEM

AIR MIX DOOR CONTROL SYSTEM

System Diagram

INFOID:0000000005246233

System Description

INFOID:0000000005246234

The air mix doors are 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.

Door Motor Circuit

Air Mix Door Control Specification

JSIIA0776GB

JSIIA0880GB

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