Nissan Murano. Instruction — part 812
HAC-22
< SYSTEM DESCRIPTION >
[WITHOUT 7 INCH DISPLAY]
AUTOMATIC AIR CONDITIONER SYSTEM
*: 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
AUTOMATIC AIR CONDITIONER SYSTEM
HAC-23
< SYSTEM DESCRIPTION >
[WITHOUT 7 INCH DISPLAY]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
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
HAC-24
< SYSTEM DESCRIPTION >
[WITHOUT 7 INCH DISPLAY]
AUTOMATIC AIR CONDITIONER SYSTEM
OPENING ANGLE:
• Data that shows the indicated door opening angle of each door motor.
ERROR CHECK:
• In this procedure, transmitted and received data is checked for errors. Error data is then compiled. The error
check prevents corrupted data from being used by the mode door motor, the air mix door motors, the upper
ventilator door motor and the intake door motor. Error data can be related to the following symptoms.
- Malfunction of electrical frequency
- Poor electrical connections
- Signal leakage from transmission lines
- Signal level fluctuation
STOP SIGNAL:
• At the end of each transmission, a stop operation, in-operation, or internal malfunction message is delivered
to the A/C auto amp. This completes one data transmission and control cycle.
Component Part Location
INFOID:0000000009722035
ENGINE COMPARTMENT
JPIIA0492GB
AUTOMATIC AIR CONDITIONER SYSTEM
HAC-25
< SYSTEM DESCRIPTION >
[WITHOUT 7 INCH DISPLAY]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
PASSENGER COMPARTMENT
1.
Refrigerant pressure sensor
2.
Compressor (magnet clutch)
3.
Ambient sensor
JPIIA0607ZZ
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