Nissan Murano Z51 (2008 year). Manual — part 221
COMPRESSOR CONTROL FUNCTION
HAC-11
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FUNCTION DIAGNOSIS
COMPRESSOR CONTROL FUNCTION
Description
INFOID:0000000003073019
PRINCIPLE OF OPERATION
Compressor is not activated.
Functional circuit diagram
Functional initial inspection chart
×
: Applicable
CAN (1)
: A/C switch signal
: Blower fan motor switch signal
CAN (2)
: A/C Compressor request signal
RX, TX
: A/C switch signal
: Fan ON signal
: Defroster signal
JPIIA0483GB
Control unit
Diagnosis item
Location
A
B
C
D
A/C auto amp.
“HVAC”
Self-diagnosis
×
—
—
—
Data monitor
×
—
—
—
Active test
×
—
—
×
ECM
“ENGINE”
Self-diagnosis function
(CAN system diagnosis)
—
—
×
—
Data monitor
—
×
×
—
IPDM E/R
“IPDM E/R”
Self-diagnosis function
(CAN system diagnosis)
—
—
—
×
Data monitor
—
—
×
—
Auto active test
—
—
—
×
Revision: 2008 October
2009 Murano
HAC-12
< FUNCTION DIAGNOSIS >
[WITHOUT 7 INCH DISPLAY]
COMPRESSOR CONTROL FUNCTION
Component Part Location
INFOID:0000000003073021
ENGINE COMPARTMENT
PASSENGER COMPARTMENT
1.
Refrigerant pressure sensor
2.
Compressor (magnet clutch)
3.
Ambient sensor
JPIIA0607ZZ
Revision: 2008 October
2009 Murano
COMPRESSOR CONTROL FUNCTION
HAC-13
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[WITHOUT 7 INCH DISPLAY]
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1.
Intake door motor
2.
Upper ventilator door motor
3.
Air mix door motor (passenger side)
4.
Air mix door motor (driver side)
5.
Mode door motor
6.
Sunload sensor
7.
In-vehicle sensor
8.
A/C auto amp.
9.
Intake sensor
10. Blower motor
JPIIA0608ZZ
Revision: 2008 October
2009 Murano
HAC-14
< FUNCTION DIAGNOSIS >
[WITHOUT 7 INCH DISPLAY]
COMPRESSOR CONTROL FUNCTION
Component’s Role
INFOID:0000000003073022
Component
Reference
Refrigerant pressure sensor
Compressor
Ambient sensor
Intake door motor
Upper ventilator door motor
Air mix door motor (driver side)
Air mix door motor (passenger side)
Mode door motor
Sunload sensor
In-vehicle sensor
A/C auto amp.
HAC-75, "A/C AUTO AMP. : Description"
Intake sensor
Blower motor
Revision: 2008 October
2009 Murano
AUTOMATIC AIR CONDITIONER SYSTEM
HAC-15
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[WITHOUT 7 INCH DISPLAY]
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AUTOMATIC AIR CONDITIONER SYSTEM
System Diagram
INFOID:0000000003073027
CONTROL SYSTEM
The control system consists of input sensors, switches, the A/C auto amp. (microcomputer) and outputs. The
relationship of these components is as shown in the figure below:
System Description
INFOID:0000000003073028
CONTROL OPERATION
Display
The operation status of the system is displayed on the screen.
JSIIA1539GB
JPIIA0606ZZ
Revision: 2008 October
2009 Murano
HAC-16
< FUNCTION DIAGNOSIS >
[WITHOUT 7 INCH DISPLAY]
AUTOMATIC AIR CONDITIONER SYSTEM
A/C Control
MODE Switch
The air discharge outlets are controlled with this switch.
Temperature Control Switch (Driver Side)
The set temperature is increased or decreased with this switch.
Temperature Control Switch (Passenger Side)
• The set temperature is increased or decreased with this switch.
• When this switch is pressed, DUAL switch indicator is turned ON.
AUTO Switch
• The compressor, intake doors, 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 the AUTO switch, air inlet, air outlet, fan speed, and discharge air temperature are automati-
cally controlled.
Defroster (DEF) 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.
UPPER VENT Switch
• When the UPPER VENT switch is pressed, the UPPER VENT switch indicator is turned ON.
• When the UPPER VENT switch indicator is turned ON, the UPPER VENT switch indicator is turned OFF by
pressing the defroster (DEF) switch (after the above operation, the UPPER VENT switch indicator is turned
ON by pressing the UPPER VENT switch).
A/C Switch
Compressor turns ON or OFF with this switch.
(Pressing the A/C switch when the A/C switch is ON turns 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 display screen).
OFF Switch
Compressor and blower turn OFF, air inlet sets to FRE, and mode the position is set to foot position.
Rear Window Defogger Switch
When indicator is ON, rear window is defogged.
Intake Switch
• When the intake switch is ON, the intake switch indicator is turned ON, and air inlet is set to REC.
• When the intake switch is pressed again, the intake switch indicator is turned OFF, and air inlet is set to FRE.
• When the intake switch is pressed for approximately 1.5 seconds or longer, the intake switch indicator blink
twice. Then, automatic control mode is entered. Inlet status is displayed by indicator even when automati-
cally controlled.
JPIIA0487GB
Revision: 2008 October
2009 Murano
AUTOMATIC AIR CONDITIONER SYSTEM
HAC-17
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• When the intake switch indicator 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 (set to FRE mode). REC mode can be re-
entered by pressing intake switch again, and then compressor is turned ON. (Except D/F or DEF position)
DUAL Switch
• When the DUAL switch indicator is ON, the driver side and passenger side, temperature can each be set
independently.
• When the DUAL switch indicator is OFF, the driver side outlet and setting temperature are applied to both
sides.
Revision: 2008 October
2009 Murano
HAC-18
< FUNCTION DIAGNOSIS >
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AUTOMATIC AIR CONDITIONER SYSTEM
DISCHARGE AIR FLOW
JPIIA0512GB
Revision: 2008 October
2009 Murano
AUTOMATIC AIR CONDITIONER SYSTEM
HAC-19
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AIR DISTRIBUTION
JPIIA0509GB
JPIIA0510GB
Revision: 2008 October
2009 Murano
HAC-20
< FUNCTION DIAGNOSIS >
[WITHOUT 7 INCH DISPLAY]
AUTOMATIC AIR CONDITIONER SYSTEM
SWITCHES AND THEIR CONTROL FUNCTION
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.
JPIIA0445GB
JPIIA0508GB
Revision: 2008 October
2009 Murano
AUTOMATIC AIR CONDITIONER SYSTEM
HAC-21
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A configuration of these components is as shown in the figure below.
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.
JPIIA0489GB
JPIIA0490GB
JPIIA0491GB
Revision: 2008 October
2009 Murano
HAC-22
< FUNCTION DIAGNOSIS >
[WITHOUT 7 INCH DISPLAY]
AUTOMATIC AIR CONDITIONER SYSTEM
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.
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:0000000003469067
ENGINE COMPARTMENT
JPIIA0492GB
Revision: 2008 October
2009 Murano
AUTOMATIC AIR CONDITIONER SYSTEM
HAC-23
< FUNCTION DIAGNOSIS >
[WITHOUT 7 INCH DISPLAY]
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A
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HAC
N
O
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PASSENGER COMPARTMENT
1.
Refrigerant pressure sensor
2.
Compressor (magnet clutch)
3.
Ambient sensor
JPIIA0607ZZ
Revision: 2008 October
2009 Murano
HAC-24
< FUNCTION DIAGNOSIS >
[WITHOUT 7 INCH DISPLAY]
AUTOMATIC AIR CONDITIONER SYSTEM
1.
Intake door motor
2.
Upper ventilator door motor
3.
Air mix door motor (passenger side)
4.
Air mix door motor (driver side)
5.
Mode door motor
6.
Sunload sensor
7.
In-vehicle sensor
8.
A/C auto amp.
9.
Intake sensor
10. Blower motor
JPIIA0608ZZ
Revision: 2008 October
2009 Murano
AUTOMATIC AIR CONDITIONER SYSTEM
HAC-25
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[WITHOUT 7 INCH DISPLAY]
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Component Description
INFOID:0000000003073030
Component
Reference
Refrigerant pressure sensor
Compressor
Ambient sensor
Intake door motor
Upper ventilator door motor
Air mix door motor (driver side)
Air mix door motor (passenger side)
Mode door motor
Sunload sensor
In-vehicle sensor
A/C auto amp.
HAC-75, "A/C AUTO AMP. : Description"
Intake sensor
Blower motor
Revision: 2008 October
2009 Murano
HAC-26
< FUNCTION DIAGNOSIS >
[WITHOUT 7 INCH DISPLAY]
MODE DOOR CONTROL SYSTEM
MODE DOOR CONTROL SYSTEM
System Diagram
INFOID:0000000003073036
System Description
INFOID:0000000003073037
The mode door is automatically controlled by the temperature setting, ambient temperature, in-vehicle temper-
ature, intake temperature and amount of sunload.
SYSTEM OPERATION
• The A/C auto amp. receives data from each of the sensors.
• The A/C auto amp. sends the air mix door, the mode door, the upper ventilator door and the intake door
opening angle data to the air mix door motor LCU(s), the mode door motor LCU, the upper ventilator door
motor LCU and the intake door motor LCU.
• The air mix door motor(s), the mode door motor, 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 are 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 operations is selected. The newly selected data is
returned to the A/C auto amp.
Door Motor Circuit
Mode Door Control Specification
JPIIA0493GB
JPIIA0495GB
Revision: 2008 October
2009 Murano
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