Nissan Murano Z51. Manual - part 841

AUTOMATIC AIR CONDITIONER SYSTEM

HAC-19

< SYSTEM DESCRIPTION >

[WITHOUT 7 INCH DISPLAY]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

AIR DISTRIBUTION

SWITCHES AND THEIR CONTROL FUNCTION

JPIIA0509GB

JPIIA0510GB

HAC-20

< SYSTEM DESCRIPTION >

[WITHOUT 7 INCH DISPLAY]

AUTOMATIC AIR CONDITIONER SYSTEM

*

: Models for Mexico.

JMIIA0492GB

AUTOMATIC AIR CONDITIONER SYSTEM

HAC-21

< SYSTEM DESCRIPTION >

[WITHOUT 7 INCH DISPLAY]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

*: Inlet status is displayed by indicator when activating automatic control.

AIR CONDITIONER LAN CONTROL SYSTEM

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

Switch position

Door position

Ventilator

door

Max. 

cool

door

Defroster

door

Foot
door

Upper 

ventila-

tor door

Intake

door

Air mix

door

(Driver 

side)

Air mix

door

(Pas-

senger

 side)

AUTO switch

AUTO

—

—

AUTO

MODE 

switch

VENT

A

A

A

A

—

—

B/L

B

B

A

B

FOOT

C

B

B

C

D/F

C

B

B

B

B

DEF switch

C

C

C

A

B

UPPER VENT

switch

ON

—

A-B

—

OFF

C

Intake 

switch

ON

—

—

—

—

—

A

*

OFF

B

*

Temperature 

control switch 

(Driver side)

DUAL 
switch: 
OFF

18.0

°

C

(60

°

F)

—

A

18.5

°

C 

⇔

 31.5

°

C

(61

°

F 

⇔

 89

°

F)

AUTO

32.0

°

C

(90

°

F)

B

Temperature 

control switch 

(Driver side)

DUAL 
switch: 
ON

18.0

°

C

(60

°

F)

A

—

18.5

°

C 

⇔

 31.5

°

C

(61

°

F 

⇔

 89

°

F)

AUTO

32.0

°

C

(90

°

F)

B

Temperature 

control switch 

(Passenger 

side)

18.0

°

C

(60

°

F)

—

A

18.5

°

C 

⇔

 31.5

°

C

(61

°

F 

⇔

 89

°

F)

AUTO

32.0

°

C

(90

°

F)

B

ON/OFF switch

C

C

B

C

—

B

—

—

JPIIA0489GB

HAC-22

< SYSTEM DESCRIPTION >

[WITHOUT 7 INCH DISPLAY]

AUTOMATIC AIR CONDITIONER SYSTEM

SYSTEM CONSTRUCTION

A small network exists between the A/C auto amp., the mode door motor, the air mix door motors, the upper
ventilator door motor and the intake door motor. The A/C auto amp. and motors are connected by data trans-
mission 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 A/C auto amp. and each door motor.
The following functions are contained in LCUs built into the mode door motor, the air mix door motors, the
upper ventilator door motor and the intake door motor.
• Address
• Motor opening angle signals
• Data transmission
• Motor stop and drive decision
• Opening angle sensor (PBR function)
• Comparison
• Decision (A/C auto amp. indicated value and motor opening angle comparison)

Operation

The A/C auto amp. receives data from each of the sensors. The A/C auto amp. sends mode door, the air mix
door and the intake door opening angle data to the mode door motor LCU, the air mix door motor LCUs, the
upper ventilator door motor LCU and the intake door motor LCU.
The mode door motor, the air mix door motors, the upper ventilator door motor and the intake door motor read
their respective signals according to the address signal. Opening angle indication signals received from the A/
C 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. Next, HOT/COLD, DEF/VENT, OPEN/SHUT or FRE/REC operation is
selected. The new selection data is returned to the A/C auto amp.

Transmission Data and Transmission Order

A/C auto amp. data is transmitted consecutively to each of the door motors following the form as shown in the
figure below.

START:

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

ADDRESS:

• Data sent from the A/C auto amp. is selected according to data-based decisions made by the mode door

motor, the air mix door motors, the upper ventilator door motor and the 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 has no error, door con-
trol begins.

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

upon the corrected opening angle data.

JPIIA0490GB

JPIIA0491GB