Nissan Qashqai (2007-2010). Manual - part 914

HAC-16

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AUTOMATIC AIR CONDITIONER SYSTEM

MODE Switch

The air discharge outlets is controlled with there switches.

Temperature Control Dial [Potentio Temperature Control (Driver Side)]

The set temperature is increased or decreased with this dial.

Temperature Control Dial [Potentio Temperature Control (Passenger Side)]

• The set temperature is increased or decreased with this dial.
• When the temperature control dial is turned, the DUAL switch indicator will automatically illuminate.

AUTO Switch 

• The compressor, intake door, 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.

• When pressing AUTO switch, air inlet, air outlet, fan speed, and discharge air temperature are automatically

controlled.

Defroster (DEF) Switch

Mode doors are set to the defrost position with this switch. Also, intake door is 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.)

Fan Control Dial

The blower speed is manually controlled with this dial. Seven speeds are available for manual control (as
shown on the LEDs).

ON/OFF Switch

Compressor and blower are OFF, mode door is set to the foot position, and intake door is automatically con-
trolled.

Rear Window Defogger Switch

When illumination is ON, rear window is defogged.

Recirculation (REC) Switch

• When recirculation (REC) switch is ON, REC LED turns ON, and air inlet is fixed to REC.
• When press recirculation (REC) switch again, REC LED turns OFF, and then, automatic control mode is

entered.

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

to OFF, intake switch is automatically turned OFF (fixed to automatic control mode). REC mode can be re-
entered by pressing intake switch again, and then compressor is turned ON. (Except D/F or DEF position)

Fresh (FRE) Switch

• When fresh (FRE) switch is ON, FRE LED turns ON, and air inlet is fixed to FRE.
• When press fresh (FRE) switch again, FRE LED turns OFF, and then, automatic control mode is entered.

DUAL Switch

• When the DUAL switch LED is turned ON, the driver side and passenger side, temperature can each be set

independently.

• When the DUAL switch LED is not turned OFF, the driver side outlet and setting temperature is applied to

both sides.

High-level Ventilator Switch

When high-level ventilator switch is ON, high-level ventilator switch indicator turn ON, and high-level ventilator
door is opened.

AUTOMATIC AIR CONDITIONER SYSTEM

HAC-17

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

DISCHARGE AIR FLOW

JSIIA0302GB

HAC-18

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

AUTOMATIC AIR CONDITIONER SYSTEM

SWITCHES AND THEIR CONTROL FUNCTION

AIR CONDITIONER LAN CONTROL SYSTEM

The LAN (Local Area Network) system consists of auto amp., mode door motor, high-level ventilator door
motor, air mix door motors and intake door motor.
A configuration of these components is shown in the figure below.

JPIIA0080GB

JPIIA0081GB

JPIIA0106GB

AUTOMATIC AIR CONDITIONER SYSTEM

HAC-19

< FUNCTION DIAGNOSIS >

[AUTOMATIC AIR CONDITIONER]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

SYSTEM CONSTRUCTION

A small network is constructed between the auto amp., mode door motor, high-level ventilator door motor, air
mix door motors and intake door motor. The auto amp. 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 motor.
Addresses, motor opening angle signals, motor stop signals and error checking messages are all transmitted
through the data transmission lines connecting the auto amp. and each door motor.
The following functions are contained in LCUs built into the mode door motor, the high-level ventilator 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 (Auto amp. indicated value and motor opening angle comparison)

Operation

The auto amp. receives data from each of the sensors. The auto amp. sends mode door, high-level ventilator
door, air mix door and intake door opening angle data to the mode door motor LCU, high-level ventilator door
motor LCU, air mix door motor LCUs and intake door motor LCU.
The mode door motor, high-level ventilator door motor, air mix door motors and intake door motor read their
respective signals according to the address signal. Opening angle indication signals received from the auto
amp. and each of the motor position sensors is compared by the LCUs in each door motor with the existing
decision and opening angles. Subsequently, HOT/COLD, DEF/VENT, OPEN/SHUT and FRE/REC operation
is selected. The new selection data is returned to the auto amp.

Transmission Data and Transmission Order

Auto amp. data is transmitted consecutively to each of the doors motor following the form shown in the figure
below.

START:

• Initial compulsory signal is sent to each of the door motors.

ADDRESS:

• Data sent from the auto amp. are selected according to data-based decisions made by the mode door motor,

high-level ventilator door motor, air mix door motors and intake door motor.

• If the addresses are identical, the opening angle data and error check signals are received by the door motor

LCUs. The LCUs then make the appropriate error decision. If the opening angle data have no error, door
control begins.

• If an error exists, the received data are rejected and corrected data received. Finally, door control is based

upon the corrected opening angle data.

JPIIA0107GB

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