Infiniti M35/M45 Y50. Manual - part 120

AIR CONDITIONER CONTROL

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Stop signal:

At the end of each transmission, a stop operation, in-operation, or internal malfunction message is delivered to
the unified meter and A/C amp. This completes one data transmission and control cycle.

AIR MIX DOOR CONTROL (AUTOMATIC TEMPERATURE CONTROL)

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.

FAN SPEED CONTROL

Blower speed is automatically controlled by the temperature setting, ambient temperature, in-vehicle tempera-
ture, intake temperature, amount of sunload and air mix door position.
With pressing  AUTO switch, the blower motor starts to gradually increase air flow volume.
When engine coolant temperature is low, the blower motor operation is delayed to prevent cool air from flow-
ing.

INTAKE DOOR CONTROL

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.

MODE DOOR CONTROL

The mode doors are automatically controlled by the temperature setting, ambient temperature, in-vehicle tem-
perature, intake temperature and amount of sunload.

UPPER VENTILATOR DOOR CONTROL

The upper ventilator door is automatically controlled by the mode setting, and amount of sunload.

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AIR CONDITIONER CONTROL

MAGNET CLUTCH CONTROL

When A/C switch, AUTO switch or DEF switch is pressed, unified meter and A/C amp. transmits compressor
ON signal to ECM, via CAN communication.
ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant-pressure sen-
sor signal, throttle angle, etc.). If it judges compressor can be turned ON, it sends compressor ON signal to
IPDM E/R, via CAN communication.
Upon receipt of compressor ON signal from ECM, IPDM E/R turns air conditioner relay ON to operate com-
pressor.
When sending compressor ON signal to IPDM E/R via CAN communication line, ECM simultaneously sends
compressor feedback signal to ECM via CAN communication line.
ECM sends compressor feedback signal to unified meter and A/C amp., then, uses input compressor feed-
back signal to control air inlet.

SELF-DIAGNOSIS SYSTEM

The self-diagnosis system is built into the unified meter and A/C amp. to quickly locate the cause of malfunc-
tions.

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AIR CONDITIONER CONTROL

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Description of Control System

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The control system consists of input sensors, switches, the unified meter and A/C amp. (microcomputer) and
outputs. The relationship of these components is shown in the figure below:

Control Operation

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DISPLAY SCREEN

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AIR CONDITIONER CONTROL

MULTIFUNCTION SWITCH

DISPLAY SCREEN

The operation status of the system is displayed on the screen.

MODE SWITCH (DRIVER SIDE)

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Controls the air discharge outlets.

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When the DUAL switch indicator is not illuminated, the driver side and passenger side outlets are
switched together.

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When the DUAL switch indicator is illuminated, only the driver side outlet is switched.

MODE SWITCH (PASSENGER SIDE)

When the MODE switch (passenger side) is pressed, the DUAL switch indicator illuminates, and only the pas-
senger side outlet is switched.

TEMPERATURE CONTROL SWITCH (POTENTIO TEMPERATURE CONTROL) (DRIVER SIDE) 

The set temperature is Increased or decreased with this switch.

TEMPERATURE CONTROL SWITCH (POTENTIO TEMPERATURE CONTROL) (PASSENGER 
SIDE) 

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The set temperature is Increased or decreased with this switch.

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When the temperature switch is pressed, the DUAL switch indicator will automatically illuminate.

AUTO SWITCH 

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The compressor, intake doors, air mix doors, mode doors and blower speed are automatically controlled
so that the in-vehicle temperature will reach, and be maintained at the set temperature selected by the
operator.

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When pressing AUTO switch, air inlet, air outlet, fan speed, and discharge air temperature are automati-
cally controlled.

DEFROSTER (DEF) SWITCH

Mode doors are set to the defrost position with this switch. Also, intake doors are set to the outside air position,
and compressor turns ON.

UPPER VENT SWITCH

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When UPPER VENT switch is ON, UPPER VENT switch indicator turn ON, and upper ventilator door is
automatically controlled.

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When DEFROSTER (DEF) switch is ON, upper ventilator door is shut.

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When MODE position (driver side) is FOOT or D/F, upper ventilation door is shut.

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