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]

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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]

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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