Nissan Tiida C11. Manual - part 857

HAC-92

< FUNCTION DIAGNOSIS >

[AUTO AIR CONDITIONER (W/O NAVI)]

AUTOMATIC AIR CONDITIONER SYSTEM

AUTOMATIC AIR CONDITIONER SYSTEM

Control System Diagram

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CONTROL SYSTEM

The control system consists of input sensors, switches, the front air control (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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AUTOMATIC AIR CONDITIONER SYSTEM

HAC-93

< FUNCTION DIAGNOSIS >

[AUTO AIR CONDITIONER (W/O NAVI)]

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DISPLAY

Displays the operational status of the system.

AUTO SWITCH 

• The compressor, intake doors, 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, fan speed, and discharge air temperature are automatically

controlled. (Inlet is automatically controlled only when FRE or REC switch is OFF.)

TEMPERATURE CONTROL SWITCH (POTENTIO TEMPERATURE CONTROL) 

Increases or decreases the set temperature.

RECIRCULATION (REC) SWITCH

• When REC switch is ON, REC switch indicator turns ON, air inlet is fixed to REC, and compressor will turn

ON.

• When FRE switch is turned ON, air outlet switches to D/F or DEF position, or when compressor is turned

from ON to OFF, REC switch is automatically turned OFF (fixed to FRE mode).

FRESH (FRE) SWITCH

• When FRE switch is ON, FRE switch indicator turns ON, and air inlet is fixed to FRE.
• When REC switch is turned ON, FRE switch is automatically turned OFF (fixed to REC mode). FRE mode

can be re-entered by pressing FRE switch again.

DEFROSTER (DEF) SWITCH

Positions the air outlet doors to the defrost position. Also positions the intake doors to the outside air position,
and compressor will turn ON.

REAR WINDOW DEFOGGER SWITCH

When illumination is ON, rear window is 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 position.

A/C SWITCH

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

MODE SWITCH

Controls the air discharge outlets.
When air outlet switches to D/F position, compressor will turn ON and fixed to REC mode.

BLOWER MOTOR SWITCH

Manually control the blower speed. Four speeds are available for manual control (as shown on the display).

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Blower motor switch

2.

Defroster (DEF) switch 

3.

Rear window defogger switch

4.

Display

5.

A/C switch

6.

OFF switch

7.

Temperature control switch

8.

AUTO switch

9.

Recirculation (REC) switch

10.

Fresh (FRE) switch

11.

MODE switch

HAC-94

< FUNCTION DIAGNOSIS >

[AUTO AIR CONDITIONER (W/O NAVI)]

AUTOMATIC AIR CONDITIONER SYSTEM

MAGNET CLUTCH CONTROL

When A/C switch, AUTO switch or DEF switch is pressed, front air control inputs compressor ON signal to
BCM.
BCM sends compressor ON signal to ECM, via CAN communication line.
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 line.
Upon receipt of compressor ON signal from ECM, IPDM E/R turns air conditioner relay ON to operate com-
pressor.

Discharge Air Flow

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Mode door position

Air outlet/distribution

Vent

Foot

Defroster

100%

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56%

44%

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16%

64%

20%

16%

53%

31%

17%

—

83%

Airflow always present at driver and passenger side demisters

WJIA2190E

AUTOMATIC AIR CONDITIONER SYSTEM

HAC-95

< FUNCTION DIAGNOSIS >

[AUTO AIR CONDITIONER (W/O NAVI)]

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Switches And Their Control Function 

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