Nissan Murano Z51 (2008 year). Manual — part 222
MODE DOOR CONTROL SYSTEM
HAC-27
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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
HAC-28
< FUNCTION DIAGNOSIS >
[WITHOUT 7 INCH DISPLAY]
UPPER VENTILATOR DOOR CONTROL SYSTEM
UPPER VENTILATOR DOOR CONTROL SYSTEM
System Diagram
INFOID:0000000003318282
System Description
INFOID:0000000003318283
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
JPIIA0496GB
JPIIA0495GB
Revision: 2008 October
2009 Murano
UPPER VENTILATOR DOOR CONTROL SYSTEM
HAC-29
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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
HAC-30
< FUNCTION DIAGNOSIS >
[WITHOUT 7 INCH DISPLAY]
AIR MIX DOOR CONTROL SYSTEM
AIR MIX DOOR CONTROL SYSTEM
System Diagram
INFOID:0000000003073040
System Description
INFOID:0000000003073041
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
JPIIA0498GB
JPIIA0495GB
Revision: 2008 October
2009 Murano
AIR MIX DOOR CONTROL SYSTEM
HAC-31
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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
HAC-32
< FUNCTION DIAGNOSIS >
[WITHOUT 7 INCH DISPLAY]
INTAKE DOOR CONTROL SYSTEM
INTAKE DOOR CONTROL SYSTEM
System Diagram
INFOID:0000000003073042
System Description
INFOID:0000000003073043
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
JPIIA0500GB
JPIIA0495GB
Revision: 2008 October
2009 Murano
INTAKE DOOR CONTROL SYSTEM
HAC-33
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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
HAC-34
< FUNCTION DIAGNOSIS >
[WITHOUT 7 INCH DISPLAY]
BLOWER MOTOR CONTROL SYSTEM
BLOWER MOTOR CONTROL SYSTEM
System Diagram
INFOID:0000000003073046
System Description
INFOID:0000000003073047
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 switch of A/C control, 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.
JSIIA1540GB
JSIIA0999ZZ
Revision: 2008 October
2009 Murano
BLOWER MOTOR CONTROL SYSTEM
HAC-35
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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
HAC-36
< FUNCTION DIAGNOSIS >
[WITHOUT 7 INCH DISPLAY]
MAGNET CLUTCH CONTROL SYSTEM
MAGNET CLUTCH CONTROL SYSTEM
System Diagram
INFOID:0000000003073048
System Description
INFOID:0000000003073049
The A/C auto amp. controls compressor operation by ambient temperature, intake air temperature and signal
from ECM.
SYSTEM OPERATION
When the A/C switch, the AUTO switch, or the DEF switch is pressed, or when shifting mode position D/F, A/C
auto amp. transmit the A/C switch signal and blower fan motor switch signal to the ECM, via CAN communica-
tion.
ECM judges whether compressor can be turned ON, based on each sensor status (refrigerant-pressure sen-
sor signal, throttle angle, etc.). If the ECM judges that the compressor can be turned ON, it sends A/C com-
pressor request signal to the IPDM E/R, via CAN communication.
Upon receipt of A/C compressor request signal from the ECM, the IPDM E/R turns the A/C relay ON to oper-
ate the compressor.
When sending A/C compressor request signal to the IPDM E/R via CAN communication line, the ECM simul-
taneously sends A/C compressor feedback signal to A/C auto amp. via CAN communication line.
The ECM sends A/C compressor feedback signal to A/C auto amp., then, uses input A/C compressor feed-
back signal to control air inlet.
Compressor Protection Control
The ECM makes the A/C relay turn OFF and stops the compressor when pressure on the high-pressure side
detected by the refrigerant pressure sensor is over approximately 3,119 kPa (31.8 kg/cm
2
, 452 psi), or below
approximately 118 kPa (1.2 kg/cm
2
, 17 psi).
Low Temperature Protection Control
Turn the A/C relay to OFF and stop the compressor by the signal from the A/C auto amp according to the
evaporator passing air temperature detected by the intake sensor and the ambient temperature detected by
the ambient sensor.
JSIIA1541GB
Revision: 2008 October
2009 Murano
CAN COMMUNICATION SYSTEM
HAC-37
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CAN COMMUNICATION SYSTEM
System Description
INFOID:0000000003073031
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 each 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. For details, refer to
LAN-25, "CAN System Specification Chart"
Revision: 2008 October
2009 Murano
HAC-38
< FUNCTION DIAGNOSIS >
[WITHOUT 7 INCH DISPLAY]
DIAGNOSIS SYSTEM (HVAC)
DIAGNOSIS SYSTEM (HVAC)
CONSULT-III Function
INFOID:0000000003073035
CONSULT-III can display each diagnosis item using the diagnosis test modes shown as per the following.
CONSULT-III application items
SELF DIAGNOSTIC RESULT
Display Item List
Diagnosis mode
Description
ECU Identification
Displays the A/C auto amp. number.
Self Diagnostic Result
Displays the diagnosis results judged by A/C auto amp.
Data Monitor
Displays A/C auto amp. input/output data in real time.
Active Test
The signals used to activate each device are forcibly supplied from A/C auto amp.
Work Support
Changes the setting for each system function.
• Temperature setting trimmer
• Inlet port memory function (FRE)
• Inlet port memory function (REC)
• Foot position setting trimmer
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
U1000
CAN COMM CIRCUIT
When A/C auto amp. is not transmitting
or receiving CAN communication signal
for 2 or more seconds.
CAN communication system
U1010
CONTROL UNIT (CAN)
When detecting error during the initial
diagnosis of CAN controller of A/C auto
amp.
A/C auto amp.
B257B
AMB TEMP SEN SHORT
Detected temperature at ambient sen-
sor
−
44
°
C (
−
47
°
F) or less
• Ambient sensor
• A/C auto amp.
• Harness and connector
(Ambient sensor circuit is open,
or there is a short in the circuit)
B257C
AMB TEMP SEN OPEN
Detected temperature at ambient sen-
sor 100
°
C (212
°
F) or more
B2578
IN CAR SEN SHORT
Detected temperature at in-vehicle sen-
sor
−
44
°
C (
−
47
°
F) or less
• In-vehicle sensor
• A/C auto amp.
• Harness and connector
(In-vehicle sensor circuit is open,
or there is a short in the circuit)
B2579
IN CAR SEN OPEN
Detected temperature at in-vehicle sen-
sor 100
°
C (212
°
F) or more
B2581
EVAP TEMP SEN SHORT
Detected temperature at intake sensor
−
33
°
C (
−
27
°
F) or less
• Intake sensor
• A/C auto amp.
• Harness and connector
(Intake sensor circuit is open, or
there is a short in the circuit)
B2582
EVAP TEMP SEN OPEN
Detected temperature at intake sensor
69
°
C (156
°
F) or more
B2630
*
SUNLOAD SEN SHORT
Detected calorie at sunload sensor 64.7
w/m
2
(56 kcal/m
2
·h) or less
• Sunload sensor
• A/C auto amp.
• Harness and connector
(Sunload sensor circuit is open,
or there is a short in the circuit)
B2631
*
SUNLOAD SEN OPEN
Detected calorie at sunload sensor
2832 w/m
2
(2436 kcal/m
2
·h) or more
B2632
DR AIRMIX ACTR SHORT
Air mix door PBR (driver side) position
5% or less
• Air mix door motor (driver side)
• A/C auto amp.
• Harness and connector
(CAN communication line is open
or shorted)
(Air mix door motor is open or
shorted)
B2633
DR AIRMIX ACTR OPEN
Air mix door PBR (driver side) position
95% or more
Revision: 2008 October
2009 Murano
DIAGNOSIS SYSTEM (HVAC)
HAC-39
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*: Perform self-diagnosis under sunshine. When performing indoors, aim a light (more than 60 W) at sunload sensor, otherwise self-diag-
nosis indicates even though the sunload sensor is functioning normally.
DATA MONITOR
Display item list
B2634
PASS AIRMIX ACTR SHORT
Air mix door PBR (passenger side) po-
sition 5% or less
• Air mix door motor (passenger
side)
• A/C auto amp.
• Harness and connector
(CAN communication line is open
or shorted)
(Air mix door motor is open or
shorted)
B2635
PASS AIRMIX ACTR OPEN
Air mix door PBR (passenger side) po-
sition 95% or more
B2636
DR VENT DOOR FAIL
When the malfunctioning door position
is detected at VENT position
• Mode door motor
• A/C auto amp.
• Harness and connector
(CAN communication line is open
or shorted)
(Mode door motor is open or
shorted)
B2637
DR B/L DOOR FAIL
When the malfunctioning door position
is detected at B/L position
B2638
DR D/F1 DOOR FAIL
When the malfunctioning door position
is detected at FOOT position
B2639
DR DEF DOOR FAIL
When the malfunctioning door position
is detected at DEF position
B263D
FRE DOOR FAIL
When the malfunctioning intake door
position is detected at FRE position
• Intake door motor
• A/C auto amp.
• Harness and connector
(CAN communication line is open
or shorted)
(Intake door motor is open or
shorted)
B263E
20P FRE DOOR FAIL
When the malfunctioning intake door
position is detected at 20%FRE posi-
tion
B263F
REC DOOR FAIL
When the malfunctioning intake door
position is detected at REC position
B2654
D/F2 DOOR FAIL
When the malfunctioning door position
is detected at D/F position
• Mode door motor
• A/C auto amp.
• Harness and connector
(CAN communication line is open
or shorted)
(Mode door motor is open or
shorted)
B2655
B/L2 DOOR FAIL
When the malfunctioning door position
is detected at B/L2 position
B2661
UPPER VENT DOOR OPEN POSI
FAIL
When the malfunctioning upper ventila-
tor door position is detected at open po-
sition.
• Upper ventilator door motor
• A/C auto amp.
• Harness and connector
(CAN communication line is open
or shorted)
(Upper ventilator door motor is
open or shorted)
B2662
UPPER VENT DOOR MID POSI FAIL
When the malfunctioning upper ventila-
tor door position is detected at middle
position.
B2663
UPPER VENT DOOR SHUT POSI
FAIL
When the malfunctioning upper ventila-
tor door position is detected at shut po-
sition.
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
Monitor item [Unit]
Description
COMP REQ SIG
[On/Off]
Displays A/C switch ON/OFF status transmitted to other units via CAN communication
FAN REQ SIG
[On/Off]
Displays blower switch ON/OFF status transmitted to other units via CAN communica-
tion
AMB TEMP SEN
[
°
C]
Ambient sensor value converted from ambient sensor signal received from ambient
sensor
IN-VEH TEMP
[
°
C]
In-vehicle sensor value converted from in-vehicle sensor signal received from in-vehi-
cle sensor
INT TEMP SEN
[
°
C]
Intake sensor value converted from intake sensor signal received from intake sensor
SUNLOAD SEN
[w/m
2
]
Sunload sensor value converted from sunload sensor signal received from sunload
sensor
Revision: 2008 October
2009 Murano
HAC-40
< FUNCTION DIAGNOSIS >
[WITHOUT 7 INCH DISPLAY]
DIAGNOSIS SYSTEM (HVAC)
ACTIVE TEST
HVAC TEST
NOTE:
Perform the inspection of each output device after starting the engine because the compressor is operated.
WORK SUPPORT
AMB SEN CAL
[
°
C]
Ambient sensor value calculated by A/C auto amp.
IN-VEH CAL
[
°
C]
In-vehicle sensor value calculated by A/C auto amp.
INT TEMP CAL
[
°
C]
Intake sensor value calculated by A/C auto amp.
SUNL SEN CAL
[w/m
2
]
Sunload sensor value calculated by A/C auto amp.
FAN DUTY
Duty ratio of blower motor judged by A/C auto amp.
XM
Target discharge air temperature judged by A/C auto amp. according to the tempera-
ture setting and the value from each sensor
ENG COOL TEMP
[
°
C]
Water temperature signal value received from ECM via CAN communication
VEHICLE SPEED
[Mph
(km/h)]
Vehicle speed signal value received from meter via CAN communication
Monitor item [Unit]
Description
Test item
Description
ALL SEG
NOTE:
• Item can be displayed but cannot be tested.
• When choosing to turn “ALL SEG” on, error message is displayed but it is not malfunction.
HVAC TEST
The operation check of A/C system can be performed by selecting the mode. Refer to the
following table for the conditions of each mode.
Test item
MODE 1
MODE 2
MODE 3
MODE 4
MODE 5
MODE 6
MODE 7
Mode door position
VENT1
VENT2
B/L1
B/L2
FOOT
D/F
DEF
Intake door position
REC
REC
20%FRE
20%FRE
FRE
FRE
FRE
Air mix door position
(driver & passenger
side)
FULL COLD
FULL HOT
FULL COLD
FULL HOT
FULL HOT
FULL HOT
FULL HOT
Blower motor duty ratio
35%
35%
61%
61%
81%
81%
35%
Compressor (Magnet
clutch)
ON
ON
ON
ON
OFF
OFF
ON
Upper ventilator door
OPEN
SHUT
OPEN
SHUT
SHUT
SHUT
SHUT
Work item
Description
Reference
TEMP SET CORRECT
(Setting of difference between tem-
perature setting and control tempera-
ture)
If the temperature felt by the customer is different than the air flow
temperature controlled by the temperature setting, the auto ampli-
fier control temperature can be adjusted to compensate for the
temperature setting.
HAC-9, "Temperature
Setting Trimmer"
BLOW SET
(Blow setting to DEF in FOOT mode)
In the FOOT mode, the air blowing to the DEF can change ON/
OFF.
HAC-9, "Foot Position
Setting Trimmer"
Revision: 2008 October
2009 Murano
DIAGNOSIS SYSTEM (HVAC)
HAC-41
< FUNCTION DIAGNOSIS >
[WITHOUT 7 INCH DISPLAY]
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NOTE:
When the battery cable is disconnected from the negative terminal or when the battery voltage becomes 10 V or less, the setting of
WORK SUPPORT may be cancelled.
FRE MEMORY SET
(FRE memory function setting)
• If the ignition switch is turned to the OFF position while the FRE
switch is set to ON (fresh air intake), “Perform the memory” or
“Do not perform the memory” of the FRE switch ON (fresh air in-
take) condition can be selected.
• If “Perform the memory” was set, the FRE switch will be ON
(fresh air intake) when turning the ignition switch to the ON posi-
tion again.
• If “Do not perform the memory” was set, the air inlets will be con-
trolled automatically when turning the ignition switch to the ON
position again.
HAC-10, "Inlet Port
Memory Function (FRE)"
REC MEMORY SET
(REC memory function setting)
• If the ignition switch is turned to the OFF position while the REC
switch is set to ON (recirculation), “Perform the memory” or “Do
not perform the memory” of the REC switch ON (recirculation)
condition can be selected.
• If “Perform the memory” was set, the REC switch will be ON (re-
circulation) when turning the ignition switch to the ON position
again.
• If “Do not perform the memory” was set, the air inlets will be con-
trolled automatically when turning the ignition switch to the ON
position again.
HAC-10, "Inlet Port
Memory Function (REC)"
Work item
Description
Reference
Revision: 2008 October
2009 Murano
HAC-42
< COMPONENT DIAGNOSIS >
[WITHOUT 7 INCH DISPLAY]
U1000 CAN COMM CIRCUIT
COMPONENT DIAGNOSIS
U1000 CAN COMM CIRCUIT
Description
INFOID:0000000003412916
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 two
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 Signal Chart. Refer to
LAN-15, "How to Use CAN Communication Signal Chart"
.
DTC Logic
INFOID:0000000003412917
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000003412918
1.
CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT-III
1.
Turn ignition switch ON and wait for 2 or more seconds.
2.
Using CONSULT-III, perform “SFLF-DIAGNOSIS RESULTS” of HVAC.
Is “CAN COMM CIRCUIT” displayed?
YES
>> Perform trouble diagnosis for the CAN communication system. Refer to
.
NO
>> Perform the intermittent malfunction diagnosis. Refer to
GI-40, "Intermittent Incident"
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
U1000
CAN COMM CIRCUIT
When A/C auto amp. is not transmitting
or receiving CAN communication signal
for 2 or more seconds.
CAN communication system
Revision: 2008 October
2009 Murano
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