Infiniti QX56 (JA60). Manual - part 589

AUTOMATIC AIR CONDITIONER SYSTEM

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Control System Diagram

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CONTROL SYSTEM

The control system consists of input sensors, switches, the A/C auto amp.(microcomputer) and outputs.

The relationship of these components is shown in the figure below:

Control System Description

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CONTROL OPERATION

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A/C auto amp.

DISPLAY SCREEN

Displays the operational status of the system.

AUTO SWITCH 

• The compressor, intake door, air mix doors, outlet 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.

• When pressing AUTO switch, air inlet, air outlet, blower speed, and discharge air temperature are automati-

cally controlled.

TEMPERATURE CONTROL DIAL (DRIVER)

Increases or decreases the set temperature.

TEMPERATURE CONTROL DIAL (PASSENGER)

Increases or decreases the set temperature.

RECIRCULATION (

) SWITCH

• When REC switch is ON, REC switch indicator turns ON, and air inlet is set to REC.

• When REC switch is turned OFF, or when compressor is turned from ON to OFF, REC switch is automati-

cally turned OFF. REC mode can be re-entered by pressing REC switch again.

• REC switch is not operated when DEF switch is turned ON, at the D/F position, or in floor position.

DEFROSTER (

) SWITCH

Positions the air outlet doors to the defrost position. Also positions the intake doors to the outside air position,

and turns A/C compressor ON.

REAR WINDOW DEFOGGER SWITCH

When switch is ON, rear window and door mirrors are defogged.

OFF SWITCH

The compressor and blower are OFF, the intake doors are set to the outside air position, and the air outlet

doors are set to the foot (75% foot and 25% defrost) position.

A/C SWITCH

The compressor is ON or OFF.

(Pressing the A/C switch when the AUTO switch is ON will turn off the A/C switch and compressor.)

MODE SWITCH

Controls the air discharge outlets.

FRONT BLOWER CONTROL SWITCHES 

Manually control the blower speed. 

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Rear Air Controls

REAR TEMPERATURE CONTROL DIAL (FRONT/REAR)

The temperature increases or decreases the set temperature. 

REAR MODE SWITCHES (FRONT/REAR)

Controls the air discharge outlets.

REAR BLOWER CONTROL DIAL (FRONT)

When the REAR CTRL switch is in the off (indicator off) the rear air control (front) controls the rear blower

motor speed regardless of the rear air control (rear) blower control dial (rear) position. The rear air control

(front) controls the blower motor speed.

REAR BLOWER CONTROL DIAL (REAR)

When the REAR CTRL switch is in the on (indicator on) the rear air control (rear) controls the rear blower

motor speed regardless of the rear air control (front) blower control dial (front) position. The rear air control

(rear) controls the blower motor speed.

MAGNET CLUTCH CONTROL

When A/C switch or DEF switch is pressed, A/C auto amp. inputs compressor ON signal to BCM.

BCM sends compressor ON signal to ECM and A/C auto amp., via CAN communication line.

ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant pressure sen-

sor signal, throttle angle sensor, etc.). If it judges compressor can be turned ON, it sends compressor ON sig-

nal to IPDM E/R, via CAN communication line.

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Rear air control (front)

2.

Rear air control (rear)

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Upon receipt of compressor ON signal from ECM, IPDM E/R turns air conditioner relay ON to operate com-

pressor.

Discharge Air Flow (Front)

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Discharge Air Flow (Rear)

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Mode door position

Air outlet/distribution

Vent

Foot

Defroster

95%

5%

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60%

40%

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70%

30%

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60%

40%

—

10%

90%

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