Nissan Murano Z50 (2003 year). Manual — part 4
AIR CONDITIONER CONTROL
ATC-27
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AIR MIX DOOR CONTROL (AUTOMATIC TEMPERATURE CONTROL)
The air mix door is automatically controlled so that in-vehicle temperature is maintained at a predetermined
value by: The temperature setting, ambient temperature, in-vehicle temperature and amount of sunload.
FAN SPEED CONTROL
Blower speed is automatically controlled based on temperature setting, ambient temperature, in-vehicle tem-
perature, intake temperature, amount of sunload and air mix door position.
When pressing 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.
INTAKE DOOR CONTROL
The intake doors are automatically controlled by: The temperature setting, ambient temperature, in-vehicle
temperature, intake temperature, amount of sunload and ON-OFF operation of the compressor.
OUTLET DOOR CONTROL
The outlet door is automatically controlled by: The temperature setting, ambient temperature, in-vehicle tem-
perature, intake temperature and amount of sunload.
MAGNET CLUTCH CONTROL
When A/C switch or DEF switch is pressed, unified meter and A/C amp. inputs compressor ON signal to BCM.
BCM sends compressor ON signal to ECM, via CAN communication line.
ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant-pressure sen-
sor signal, throttle angle, etc.). If it judges compressor can be turned ON, it sends compressor ON signal to
IPDM E/R, via CAN communication line.
Upon receipt of compressor ON signal from ECM, IPDM E/R turns air conditioner relay ON to operate com-
pressor.
SELF-DIAGNOSTIC SYSTEM
The self-diagnostic system is built into the unified meter and A/C amp. to quickly locate the cause of symp-
toms.
RJIA1750E
ATC-28
AIR CONDITIONER CONTROL
Revision; 2004 April
2003 Murano
Description of Control System
AJS000YQ
The control system consists of input sensors, switches, the unified meter and A/C amp. (microcomputer) and
outputs.
The relationship of these components is shown in the figure below:
Control Operation
AJS000YR
RJIA1751E
RJIA1752E
AIR CONDITIONER CONTROL
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DISPLAY SCREEN
Displays the operational status of the system.
AUTO SWITCH
●
The compressor, intake doors, air mix doors, outlet 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 automati-
cally controlled.
TEMPERATURE DIAL (POTENTIO TEMPERATURE CONTROL) (DRIVER SIDE)
Increases or decreases the set temperature.
TEMPERATURE DIAL (POTENTIO TEMPERATURE CONTROL) (PASSENGER SIDE)
●
Increases or decreases the set temperature.
●
When the temperature dial is turned, the dual switch indicator will automatically illuminate.
RECIRCULATION (REC) SWITCH
●
When REC switch is ON, REC switch indicator turns ON, and air inlet is fixed to REC.
●
When REC switch is ON and is pressed for approximately 1.5 seconds or longer, REC and FRE switch
indicators blink twice. Then, automatic control mode is entered. Inlet status is displayed even during auto-
matically controlled.
●
When FRE switch is turned ON, or when compressor is turned from ON to OFF, REC switch is automati-
cally turned OFF (fixed to FRE mode). REC mode can be re-entered by pressing REC switch again.
●
REC switch is not operated when DEF switch is turned ON, or at the D/F position.
FRESH (FRE) SWITCH
●
When FRE switch is ON, FRE switch indicator turns ON, and air inlet is fixed to FRE.
●
When FRE switch is ON and is pressed for approximately 1.5 seconds or longer, REC and FRE switch
indicators blink twice. Then, automatic control mode is entered. Inlet status is displayed even during auto-
matically controlled.
●
When REC switch is turned ON, FRE switch is automatically turned OFF (fixed to REC mode). FRE mode
can be re-entered by pressing FRE switch again.
DEFROSTER (DEF) SWITCH
Positions the air outlet doors to the defrost position. Also positions the intake doors to the fresh air position.
REAR WINDOW DEFOGGER SWITCH
When illumination is ON, rear window is defogged.
OFF SWITCH
The compressor and blower are OFF, the intake doors are set to the fresh air position, and the air outlet doors
are set to the foot (75% foot and 25% defrost) position.
A/C SWITCH
The compressor is ON or OFF.
(Pressing the A/C switch when the AUTO switch is ON will turn off the A/C switch and compressor.)
MODE SWITCH
Controls the air discharge outlets.
FAN CONTROL DIAL
Manually control the blower speed. Seven speeds are available for manual control (as shown on the display
screen).
DUAL SWITCH (WITH LEFT AND RIGHT VENTILATION TEMPERATURE SEPARATELY CON-
TROL SYSTEM)
●
When the DUAL switch indicator is not illuminated and the DUAL switch is pressed, the driver-side setting
temperature and passenger-side setting temperature, can each be set independently.
●
When DUAL switch indicator is not illuminated and the DUAL switch is pressed, the driver-side setting
temperature is applied to both sides.
ATC-30
AIR CONDITIONER CONTROL
Revision; 2004 April
2003 Murano
Fail-safe Function
AJS000YS
●
If a communication error exists between unified meter and A/C amp. and A/C and Audio controller for 30
seconds or longer, air conditioner is controlled under following conditions:
–
Compressor: ON
–
Air outlet: AUTO
–
Air inlet: FRE (Fresh)
–
Blower fan speed: AUTO
–
Set temperature: Setting before communication error occurs.
AIR CONDITIONER CONTROL
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Discharge Air Flow
AJS000YT
RJIA1753E
ATC-32
AIR CONDITIONER CONTROL
Revision; 2004 April
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System Description
AJS000YU
SWITCHES AND THEIR CONTROL FUNCTION
RJIA1754E
RJIA1755E
AIR CONDITIONER CONTROL
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CAN Communication System Description
AJS001BX
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
CAN Communication Unit For 2WD Models
AJS001BZ
×
: Applicable
Body type
Wagon
Axle
2WD
Engine
VQ35DE
Transmission
CVT
Brake control
ABS
VDC
Low tire pressure warning
system
×
×
×
×
×
×
×
×
Navigation system
×
×
×
×
×
×
×
×
Automatic drive positioner
×
×
×
×
×
×
×
×
CAN communication unit
ECM
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
TCM
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
Low tire pressure warning
control unit
×
×
×
×
×
×
×
×
Display unit
×
×
×
×
×
×
×
×
Display control unit
×
×
×
×
×
×
×
×
Data link connector
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
BCM
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
Unified meter and A/C amp.
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
Steering angle sensor
×
×
×
×
×
×
×
×
Driver seat control unit
×
×
×
×
×
×
×
×
ABS actuator and electric
unit (control unit)
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
IPDM E/R
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
×
CAN communication type
ATC-34, "TYPE 1/TYPE 2/TYPE 3/TYPE 4/TYPE
ATC-34
AIR CONDITIONER CONTROL
Revision; 2004 April
2003 Murano
TYPE 1/TYPE 2/TYPE 3/TYPE 4/TYPE 5/TYPE 6/TYPE 7/TYPE 8
System Diagram
●
Type1
●
Type2
●
Type3
SKIA4902E
SKIA4903E
SKIA4904E
AIR CONDITIONER CONTROL
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Type4
●
Type5
●
Type6
SKIA4905E
SKIA4906E
SKIA4907E
ATC-36
AIR CONDITIONER CONTROL
Revision; 2004 April
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●
Type7
●
Type8
SKIA4908E
SKIA4909E
AIR CONDITIONER CONTROL
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Input/output Signal Chart
T: Transmit R: Receive
Signals
ECM
TCM
Low
tire
pres-
sure
warn-
ing
control
unit
Dis-
play
unit
Dis-
play
control
unit
BCM
Uni-
fied
meter
and A/
C amp.
Driver
seat
control
unit
ABS
actua-
tor and
elec-
tric unit
(con-
trol
unit)
IPDM
E/R
Engine speed signal
T
R
R
R
R
Engine status signal
T
R
Engine coolant temperature signal
T
R
CVT position indicator signal
T
R
Second position signal
R
T
Second position indicator signal
T
R
Engine and CVT integrated control
signal
T
R
R
T
Accelerator pedal position signal
T
R
Closed throttle position signal
T
R
Wide open throttle position signal
T
R
Key switch signal
T
R
Ignition switch signal
T
R
R
P range signal
T
R
Stop lamp switch signal
R
T
Fuel consumption monitor signal
T
R
CVT self-diagnosis signal
R
T
ABS operation signal
R
T
Air conditioner switch signal
R
T
A/C compressor request signal
T
R
A/C compressor feedback signal
T
R
Blower fan motor switch signal
R
T
A/C control signal
T
T
R
R
R
T
Cooling fan speed request signal
T
R
Position lights request signal
T
R
R
Low beam request signal
T
R
Low beam status signal
R
T
High beam request signal
T
R
R
High beam status signal
R
T
Front fog lights request signal
T
R
Vehicle speed signal
R
R
T
R
R
R
R
T
R
Sleep request 1 signal
T
R
Sleep request 2 signal
T
R
Door switch signal
R
T
R
R
T
R
R
R
Turn indicator signal
T
R
ATC-38
AIR CONDITIONER CONTROL
Revision; 2004 April
2003 Murano
Key fob ID signal
T
R
Key fob door unlock signal
T
R
Seat belt buckle switch signal
R
T
Oil pressure switch signal
R
T
T
R
Buzzer output signal
T
R
Fuel level sensor signal
R
T
Fuel level low warning signal
R
R
T
Malfunction indicator lamp signal
T
R
ASCD SET lamp signal
T
R
ASCD CRUISE lamp signal
T
R
Input shaft revolution signal
R
T
Output shaft revolution signal
R
T
Front wiper request signal
T
R
Front wiper stop position signal
R
T
Rear window defogger switch signal
T
R
Rear window defogger control signal
R
R
R
T
Hood switch signal
R
T
Theft warning horn request signal
T
R
Horn chirp signal
T
R
Tire pressure signal
T
R
Tire pressure data signal
T
R
R
ABS warning lamp signal
R
T
Brake warning lamp signal
R
T
System setting signal
T
T
R
Parking brake switch signal
R
T
Signals
ECM
TCM
Low
tire
pres-
sure
warn-
ing
control
unit
Dis-
play
unit
Dis-
play
control
unit
BCM
Uni-
fied
meter
and A/
C amp.
Driver
seat
control
unit
ABS
actua-
tor and
elec-
tric unit
(con-
trol
unit)
IPDM
E/R
AIR CONDITIONER CONTROL
ATC-39
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Revision; 2004 April
2003 Murano
TYPE 9/TYPE10/TYPE 11/TYPE 12/TYPE 13/TYPE 14/TYPE 15/TYPE 16
System Diagram
●
Type9
●
Type10
●
Type11
SKIA4910E
SKIA4911E
SKIA4912E
ATC-40
AIR CONDITIONER CONTROL
Revision; 2004 April
2003 Murano
●
Type12
●
Type13
●
Type14
SKIA4913E
SKIA4914E
SKIA4915E
AIR CONDITIONER CONTROL
ATC-41
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Revision; 2004 April
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●
Type15
●
Type16
SKIA4916E
SKIA4917E
ATC-42
AIR CONDITIONER CONTROL
Revision; 2004 April
2003 Murano
Input/output Signal Chart
T: Transmit R: Receive
Signals
ECM
TCM
Low
tire
pres-
sure
warn-
ing
con-
trol
unit
Dis-
play
unit
Dis-
play
con-
trol
unit
BCM
Uni-
fied
meter
and A/
C
amp.
Steer-
ing
angle
sen-
sor
Driver
seat
con-
trol
unit
ABS
actua-
tor
and
elec-
tric
unit
(con-
trol
unit)
IPDM
E/R
Engine speed signal
T
R
R
R
R
R
Engine status signal
T
R
Engine coolant temperature signal
T
R
Engine and CVT integrated control
signal
T
R
R
T
Accelerator pedal position signal
T
R
R
Closed throttle position signal
T
R
Wide open throttle position signal
T
R
Key switch signal
T
R
Ignition switch signal
T
R
R
P range signal
T
R
R
Stop lamp switch signal
R
T
VDC operation signal
R
T
Second position indicator signal
T
R
R
Second position signal
R
T
Fuel consumption monitor signal
T
R
CVT self-diagnosis signal
R
T
Input shaft revolution signal
R
T
R
Output shaft revolution signal
R
T
R
Air conditioner switch signal
R
T
A/C compressor request signal
T
R
A/C compressor feedback signal
T
R
Blower fan motor switch signal
R
T
A/C control signal
T
T
R
R
R
T
Cooling fan speed request signal
T
R
Position lights request signal
T
R
R
Low beam request signal
T
R
Low beam status signal
R
T
High beam request signal
T
R
R
High beam status signal
R
T
Front fog lights request signal
T
R
Vehicle speed signal
R
R
T
R
R
R
R
T
R
Sleep request 1 signal
T
R
Sleep request 2 signal
T
R
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