Nissan Murano Z51 (2008 year). Manual — part 229
AUTOMATIC AIR CONDITIONER SYSTEM
HAC-139
< FUNCTION DIAGNOSIS >
[WITH 7 INCH DISPLAY]
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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
JPIIA0452GB
Revision: 2008 October
2009 Murano
HAC-140
< FUNCTION DIAGNOSIS >
[WITH 7 INCH DISPLAY]
AUTOMATIC AIR CONDITIONER SYSTEM
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
AUTOMATIC AIR CONDITIONER SYSTEM
HAC-141
< FUNCTION DIAGNOSIS >
[WITH 7 INCH DISPLAY]
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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 corrected the 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:0000000003469262
ENGINE COMPARTMENT
JPIIA0492GB
Revision: 2008 October
2009 Murano
HAC-142
< FUNCTION DIAGNOSIS >
[WITH 7 INCH DISPLAY]
AUTOMATIC AIR CONDITIONER SYSTEM
PASSENGER COMPARTMENT
1.
Refrigerant pressure sensor
2.
Compressor (magnet clutch)
3.
Ambient sensor
JPIIA0607ZZ
Revision: 2008 October
2009 Murano
AUTOMATIC AIR CONDITIONER SYSTEM
HAC-143
< FUNCTION DIAGNOSIS >
[WITH 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-144
< FUNCTION DIAGNOSIS >
[WITH 7 INCH DISPLAY]
AUTOMATIC AIR CONDITIONER SYSTEM
Component Description
INFOID:0000000003469263
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-193, "A/C AUTO AMP. : Description"
Intake sensor
Blower motor
Revision: 2008 October
2009 Murano
MODE DOOR CONTROL SYSTEM
HAC-145
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[WITH 7 INCH DISPLAY]
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MODE DOOR CONTROL SYSTEM
System Diagram
INFOID:0000000003469269
System Description
INFOID:0000000003469270
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
JSIIA1543GB
JPIIA0495GB
Revision: 2008 October
2009 Murano
HAC-146
< FUNCTION DIAGNOSIS >
[WITH 7 INCH DISPLAY]
MODE DOOR CONTROL SYSTEM
Mode position can be selected manually by pressing the MODE
switch or the DEF switch on the A/C control. This enables to fix a
mode position. Pressing the AUTO switch allows automatic control
by the A/C auto amp. During the automatic control of a mode posi-
tion, a mode door position (VENT, B/L, FOOT, or D/F) is selected
based on a target the air mix door opening angle and sunload
depending on the temperature calculated by the A/C auto amp. In
addition, the D/F is selected to prevent windshield fogging only when
ambient temperature is extremely low with mode position the FOOT.
JPIIA0767GB
Revision: 2008 October
2009 Murano
UPPER VENTILATOR DOOR CONTROL SYSTEM
HAC-147
< FUNCTION DIAGNOSIS >
[WITH 7 INCH DISPLAY]
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UPPER VENTILATOR DOOR CONTROL SYSTEM
System Diagram
INFOID:0000000003469271
System Description
INFOID:0000000003469272
The upper ventilator door motor is attached to the heater & cooling unit assembly. The upper ventilator door
motor operates by the UPPER VENT switch ON/OFF. Motor rotation is conveyed to a rod which activates the
upper ventilator door.
SYSTEM OPERATION
• The A/C auto amp. receives data from each of the sensors.
• The A/C auto amp. sends 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
Upper Ventilator Specification
JSIIA1544GB
JPIIA0495GB
Revision: 2008 October
2009 Murano
HAC-148
< FUNCTION DIAGNOSIS >
[WITH 7 INCH DISPLAY]
UPPER VENTILATOR DOOR CONTROL SYSTEM
UPPER VENT switch
MODE position
Upper ventilator door position
OFF
—
Close
ON
VENT or B/L
Open (Fully-open)
ON
FOOT or D/F
Open (Intermediate)
ON
DEF
Close
Revision: 2008 October
2009 Murano
AIR MIX DOOR CONTROL SYSTEM
HAC-149
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[WITH 7 INCH DISPLAY]
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AIR MIX DOOR CONTROL SYSTEM
System Diagram
INFOID:0000000003469275
System Description
INFOID:0000000003469276
The air mix doors are automatically controlled so that in-vehicle temperature is maintained at a predetermined
value by the temperature setting, ambient temperature, 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 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 operation is selected. The newly selected data is
returned to the A/C auto amp.
Door Motor Circuit
Air Mix Door Control Specification
JSIIA1545GB
JPIIA0495GB
Revision: 2008 October
2009 Murano
HAC-150
< FUNCTION DIAGNOSIS >
[WITH 7 INCH DISPLAY]
AIR MIX DOOR CONTROL SYSTEM
When ignition switch is ON, the A/C auto amp. continuously and
automatically controls temperatures regardless of air conditioner
operational condition. When setting a target temperature with the
temperature control switch, the A/C auto amp. corrects the set tem-
perature and decides a target air mix door opening angle. The A/C
auto amp. controls air mix door according to the target air mix door
opening angle and current air mix door opening angle, keeping an
optimum air mix door opening angle. When the temperature is set at
18
°
C (60
°
F), air mix door is set on full cold, and when the tempera-
ture is set at 32
°
C (90
°
F), it is set to full hot.
JPIIA0633GB
Revision: 2008 October
2009 Murano
INTAKE DOOR CONTROL SYSTEM
HAC-151
< FUNCTION DIAGNOSIS >
[WITH 7 INCH DISPLAY]
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INTAKE DOOR CONTROL SYSTEM
System Diagram
INFOID:0000000003469277
System Description
INFOID:0000000003469278
The intake doors are automatically controlled by the temperature setting, ambient temperature, in-vehicle tem-
perature, intake temperature, amount of sunload and ON/OFF operation of the compressor.
SYSTEM OPERATION
The intake door control judges intake door position based on the ambient temperature, the intake air tempera-
ture and the in-vehicle temperature. When in shifting mode position D/F, if the DEF or OFF switches are
pressed, or when the A/C switch is OFF, the A/C auto amp. sets the intake door to the FRE position.
Door Motor Circuit
Intake Door Control Specification
JSIIA1546GB
JPIIA0495GB
Revision: 2008 October
2009 Murano
HAC-152
< FUNCTION DIAGNOSIS >
[WITH 7 INCH DISPLAY]
INTAKE DOOR CONTROL SYSTEM
Intake door position is basically set to the FRE when the FRE indica-
tor of the DEF switch and the intake switch turn ON, and set on the
REC when the REC indicator of intake switch turns ON.
The intake door automatic control selects the FRE, the 20%FRE, or
the REC depending on the target air mix door opening angle, based
on in-vehicle temperature, ambient temperature, and sunload.
JPIIA0634GB
Revision: 2008 October
2009 Murano
BLOWER MOTOR CONTROL SYSTEM
HAC-153
< FUNCTION DIAGNOSIS >
[WITH 7 INCH DISPLAY]
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BLOWER MOTOR CONTROL SYSTEM
System Diagram
INFOID:0000000003469281
System Description
INFOID:0000000003469282
Blower speed is automatically controlled by the temperature setting, ambient temperature, in-vehicle tempera-
ture, intake temperature, amount of sunload and air mix door position.
By pressing the AUTO switch, the blower motor starts to gradually increase air flow volume.
When engine coolant temperature is low, the blower motor operation is delayed to prevent cool air from flow-
ing.
SYSTEM OPERATION
System operation
• For air flow, the manual selection (1-7) with the fan control dial has
priority.
• If the AUTO switch is pressed or if the DEF switch is pressed while
in the OFF condition, it changes to the automatic control by A/C
auto amp.
• When increasing the air flow, it changes the duty ratio of the blower
motor drive signal to prevent the air flow from suddenly increasing.
• There are the following types of air flow control: starting air flow
control, starting air flow control at low coolant temperature, starting
air flow control at high in-vehicle temperature, and air flow control
at actuator operation in addition to manual control, normal auto-
matic air flow control.
Normal automatic air flow control
• When the target temperature is set by the temperature control dial of preset switch, the A/C auto amp. per-
forms the calculation and decides the target according to the signal from each sensor.
• The A/C auto amp. changes the duty ratio of blower motor drive signal and controls the air flow continuously
so that the air flow becomes the target air flow.
• The minimum air flow will change according to the sunload when the air discharge outlet is VENT or B/L.
JSIIA1547GB
JSIIA0999ZZ
Revision: 2008 October
2009 Murano
HAC-154
< FUNCTION DIAGNOSIS >
[WITH 7 INCH DISPLAY]
BLOWER MOTOR CONTROL SYSTEM
Fan Speed Control Specification
Starting air flow control
• When starting the automatic control of air flow, the system gradually increases the duty ratio of the blower
motor drive signal to prevent too much air from blowing.
• The time period from when the air flow changes from LO to HI is approximately 8 seconds.
• It becomes the starting air flow control at low coolant temperature according to the calculation result of the A/
C auto amp. and engine coolant temperature [approximately 58
°
C (136
°
F) or less] during the automatic air
flow control.
• Do not perform the starting air flow control when the air discharge outlet is set to DEF.
Starting Fan Speed Control
Start up from COLD SOAK Condition (Automatic mode)
In cold start up condition where the engine coolant temperature is below 58
°
C (136
°
F), the blower does not
operate for a short period of time (up to 150 seconds). The exact start delay time varies depending on the
ambient temperature and engine coolant temperature.
In the most extreme case (very low ambient temperature) the blower start delay is 150 seconds as described
above. After this delay, the blower will operate at low speed until the engine coolant temperature rises above
58
°
C (136
°
F), and then the blower speed increases to the objective speed.
Start up from usual or HOT SOAK Condition (Automatic mode)
The blower will begin operation momentarily after the AUTO switch is pressed. The blower speed rises gradu-
ally to the objective speed over a time period of 3 seconds or less (actual time depends on the objective
blower speed).
JPIIA0635GB
Revision: 2008 October
2009 Murano
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