Nissan Murano Z51 (2008 year). Manual

COMPRESSOR CONTROL FUNCTION

HAC-11

< FUNCTION DIAGNOSIS >

[WITHOUT 7 INCH DISPLAY]

HAC

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/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

Refrigerant pressure sensor

Compressor (magnet clutch)

Ambient sensor

JPIIA0607ZZ

Revision: 2008 October

2009 Murano

COMPRESSOR CONTROL FUNCTION

HAC-13

< FUNCTION DIAGNOSIS >

[WITHOUT 7 INCH DISPLAY]

HAC

Intake door motor

Upper ventilator door motor

Air mix door motor (passenger side)

Air mix door motor (driver side)

Mode door motor

Sunload sensor

In-vehicle sensor

A/C auto amp.

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

EC-463, "Description"

Compressor

HAC-72, "Description"

Ambient sensor

HAC-44, "Description"

Intake door motor

HAC-63, "Description"

Upper ventilator door motor

HAC-65, "Description"

Air mix door motor (driver side)

HAC-56, "Description"

Air mix door motor (passenger side)

HAC-58, "Description"

Mode door motor

HAC-60, "Description"

Sunload sensor

HAC-53, "Description"

In-vehicle sensor

HAC-47, "Description"

A/C auto amp.

HAC-75, "A/C AUTO AMP. : Description"

Intake sensor

HAC-50, "Description"

Blower motor

HAC-68, "Description"

Revision: 2008 October

2009 Murano

AUTOMATIC AIR CONDITIONER SYSTEM

HAC-15

< FUNCTION DIAGNOSIS >

[WITHOUT 7 INCH DISPLAY]

HAC

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

< FUNCTION DIAGNOSIS >

[WITHOUT 7 INCH DISPLAY]

HAC

• 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

AUTOMATIC AIR CONDITIONER SYSTEM

HAC-19

< FUNCTION DIAGNOSIS >

[WITHOUT 7 INCH DISPLAY]

HAC

AIR DISTRIBUTION

JPIIA0509GB

JPIIA0510GB

Revision: 2008 October

2009 Murano

AUTOMATIC AIR CONDITIONER SYSTEM

HAC-21

< FUNCTION DIAGNOSIS >

[WITHOUT 7 INCH DISPLAY]

HAC

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]

HAC

PASSENGER COMPARTMENT

Refrigerant pressure sensor

Compressor (magnet clutch)

Ambient sensor

JPIIA0607ZZ

Revision: 2008 October

2009 Murano

HAC-24

< FUNCTION DIAGNOSIS >

[WITHOUT 7 INCH DISPLAY]

AUTOMATIC AIR CONDITIONER SYSTEM

Intake door motor

Upper ventilator door motor

Air mix door motor (passenger side)

Air mix door motor (driver side)

Mode door motor

Sunload sensor

In-vehicle sensor

A/C auto amp.

Intake sensor

10. Blower motor

JPIIA0608ZZ

Revision: 2008 October

2009 Murano

AUTOMATIC AIR CONDITIONER SYSTEM

HAC-25

< FUNCTION DIAGNOSIS >

[WITHOUT 7 INCH DISPLAY]

HAC

Component Description

INFOID:0000000003073030

Component

Reference

Refrigerant pressure sensor

EC-463, "Description"

Compressor

HAC-72, "Description"

Ambient sensor

HAC-44, "Description"

Intake door motor

HAC-63, "Description"

Upper ventilator door motor

HAC-65, "Description"

Air mix door motor (driver side)

HAC-56, "Description"

Air mix door motor (passenger side)

HAC-58, "Description"

Mode door motor

HAC-60, "Description"

Sunload sensor

HAC-53, "Description"

In-vehicle sensor

HAC-47, "Description"

A/C auto amp.

HAC-75, "A/C AUTO AMP. : Description"

Intake sensor

HAC-50, "Description"

Blower motor

HAC-68, "Description"

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

Nissan Murano Z51 (2008 year). Manual - part 221