Nissan Murano Z51 (2008 year). Manual - part 222

MODE DOOR CONTROL SYSTEM

HAC-27

< FUNCTION DIAGNOSIS >

[WITHOUT 7 INCH DISPLAY]

HAC

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

< FUNCTION DIAGNOSIS >

[WITHOUT 7 INCH DISPLAY]

HAC

UPPER VENT switch

MODE position

Upper ventilator door position

OFF

—

VENT or B/L

Open (Fully-open)

FOOT or D/F

Open (Intermediate)

DEF

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

• 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

< FUNCTION DIAGNOSIS >

[WITHOUT 7 INCH DISPLAY]

HAC

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

< FUNCTION DIAGNOSIS >

[WITHOUT 7 INCH DISPLAY]

HAC

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

< FUNCTION DIAGNOSIS >

[WITHOUT 7 INCH DISPLAY]

HAC

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

, 452 psi), or below

approximately 118 kPa (1.2 kg/cm

, 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

< FUNCTION DIAGNOSIS >

[WITHOUT 7 INCH DISPLAY]

HAC

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

Refer to

HAC-103, "DTC Index"

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

−

C (

−

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

−

C (

−

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

−

C (

−

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

(56 kcal/m

·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

(2436 kcal/m

·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

< FUNCTION DIAGNOSIS >

[WITHOUT 7 INCH DISPLAY]

HAC

*: 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

[

Ambient sensor value converted from ambient sensor signal received from ambient
sensor

IN-VEH TEMP

[

In-vehicle sensor value converted from in-vehicle sensor signal received from in-vehi-
cle sensor

INT TEMP SEN

[

Intake sensor value converted from intake sensor signal received from intake sensor

SUNLOAD SEN

[w/m

]

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

[

Ambient sensor value calculated by A/C auto amp.

IN-VEH CAL

[

In-vehicle sensor value calculated by A/C auto amp.

INT TEMP CAL

[

Intake sensor value calculated by A/C auto amp.

SUNL SEN CAL

[w/m

]

Sunload sensor value calculated by A/C auto amp.

FAN DUTY

Duty ratio of blower motor judged by A/C auto amp.

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

[

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

20%FRE

FRE

Air mix door position
(driver & passenger
side)

FULL COLD

FULL HOT

FULL COLD

FULL HOT

Blower motor duty ratio

35%

61%

81%

35%

Compressor (Magnet
clutch)

OFF

Upper ventilator door

OPEN

SHUT

OPEN

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]

HAC

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

CHECK WITH SELF-DIAGNOSIS FUNCTION OF CONSULT-III

Turn ignition switch ON and wait for 2 or more seconds.

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