Nissan Altima L32. Manual - part 810

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[AUTOMATIC AIR CONDITIONER]

AUTOMATIC AIR CONDITIONER SYSTEM

AUTOMATIC AIR CONDITIONER SYSTEM

System Diagram

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CONTROL SYSTEM

The control system consists of input sensors, switches, front air control and outputs. The relationship of these

components is shown in the figure below:

System Description

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CONTROL OPERATION

Display Screen

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

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AUTO Switch 

• The compressor, intake door, air mix door, mode door 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.

Mode Switches

The air discharge outlets is controlled through the mode door.

Temperature Control Dial (Potentio Temperature Control) (LH) 

The set temperature is increased or decreased with this dial.

Temperature Control Dial (Potentio Temperature Control) (RH) 

• The set temperature is increased or decreased with this dial.

• When the temperature control dial is turned, the DUAL switch indicator will automatically illuminate.

Defroster (

) 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.

A/C Switch

Compressor is ON or OFF with this switch.

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

Blower Control Dial/OFF Switch

• The blower speed is manually controlled with this dial. 

• Compressor and blower are OFF, intake doors and the mode doors are automatically controlled.

Rear Window Defogger Switch

This switch turns the rear window defogger ON and OFF.

DUAL Switch

• When the DUAL switch indicator is illuminated, the LH and RH temperature can each be set independently.

• When the DUAL switch indicator is not illuminated, the LH temperature setting is applied to both sides.

Recirculation (

) Switch

• When REC (

) switch is ON (REC LED ON), air inlet is fixed to REC.

• When press intake switch again (REC LED OFF), air inlet is fixed to fresh air.

1.

Temperature control dial (LH)

2:

AUTO switch

3:  A/C ON/OFF switch

4.

Air recirculation switch 

5:

OFF switch/blower control dial

6:  Defroster switch

7.

Rear window defogger switch

8:

DUAL switch

9.

Temperature control dial (RH)

10. Mode switches

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AUTOMATIC AIR CONDITIONER SYSTEM

• When REC LED is turned ON, shifting mode position to D/F or DEF, or when compressor is turned from ON

to OFF, the REC (

) switch is automatically turned OFF. 

DISCHARGE AIR FLOW

SWITCHES AND THEIR CONTROL FUNCTION

Mode door position

Air outlet/distribution

Vent

Foot

Defroster

100%

—

—

44%

56%

—

17%

59%

24%

16%

52%

32%

12%

—

88%

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AIR CONDITIONER LAN CONTROL SYSTEM

The LAN (Local Area Network) system consists of front air control, mode door motor, air mix door motors and

intake door motor.

A configuration of these components is shown in the figure below.

SYSTEM CONSTRUCTION

A small network is constructed between the front air control, mode door motor, air mix door motors and intake

door motor. The front air control and motors are connected by data transmission lines and motor power supply

lines. The LAN network is built through the ground circuits of each door motors.

Addresses, motor opening angle signals, motor stop signals and error checking messages are all transmitted

through the data transmission lines connecting the front air control and each door motor.

The following functions are contained in LCUs built into the mode door motor, the air mix door motors and the

intake door motor.

• Address

• Motor opening angle signals

• Data transmission

• Motor stop and drive decision

• Opening angle sensor (PBR function)

• Comparison

• Decision (Front air control indicated value and motor opening angle comparison)

Operation

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