Infiniti QX56 (Z62). Manual — part 779

COMPONENT PARTS

HAC-7

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Component Description

INFOID:0000000006275849

13. Aspirator

14. Front air mix door motor (Driver side) 15. Intake sensor

16. Front mode door motor

17. Front air mix door motor (Passenger

side)

18. Intake door motor

19. Front blower motor

20. A/C auto amp.

21. Front in-vehicle sensor

A.

Left side of heater & cooling unit as-
sembly

B.

Right side of heater & cooling unit as-
sembly

C.

Back side of blower unit assembly

D.

Cluster lid C is removed

E.

Instrument lower panel LH is re-
moved

Component

Description

Ambient sensor

Ambient sensor measures ambient air temperature. The sensor uses a
thermistor which is sensitive to the change in temperature. The electrical
resistance of the thermistor decreases as temperature increases.

AV control unit

AV control unit transmits front A/C control operation signal to A/C auto amp.
via CAN communication line.

A/C auto amp.

A/C auto amp. controls front automatic air conditioning system by inputting
and calculating signals from each sensor and each switch. A/C auto amp.
has self-diagnosis function. Diagnosis of front automatic air conditioning
system can be performed quickly.

Blower unit

Front blower motor

Refer to

HAC-12

.

Intake door motor

The LCU (Local Control Unit) is installed to intake door motor so as to per-
form the multiplex communication control (LIN).
Refer to

HAC-18, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM :

Door Control"

.

Combination meter

Combination meter transmits vehicle speed signal to A/C auto amp. via
CAN communication line.

ECM

ECM controls compressor according to status of engine and refrigerant.
ECM transmits engine coolant temperature signal to A/C auto amp. via
CAN communication line.

Engine coolant temperature sensor

Engine coolant temperature sensor measures engine coolant temperature.
The sensor uses a thermistor which is sensitive to the change in tempera-
ture. The electrical resistance of the thermistor decreases as temperature
increases.

Front display

Front display indicates operation status of front automatic air conditioning
system.

Front in-vehicle sensor

Front in-vehicle sensor measures temperature of intake air that flows
through aspirator to passenger room. The sensor uses a thermistor which
is sensitive to the change in temperature. The electrical resistance of the
thermistor decreases as temperature increases.

HAC-8

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

COMPONENT PARTS

REAR AUTOMATIC AIR CONDITIONING SYSTEM

Heater & cooling unit
assembly

Aspirator

Refer to

HAC-12

.

Front air mix door motor (Driver
side)

The LCU (Local Control Unit) is installed to front air mix door motor (driver
side) so as to perform the multiplex communication control (LIN).
Refer to

HAC-18, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM :

Door Control"

.

Front air mix door motor (Pas-
senger side)

The LCU (Local Control Unit) is installed to front air mix door motor (pas-
senger side) so as to perform the multiplex communication control (LIN).
Refer to

HAC-18, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM :

Door Control"

.

Front mode door motor

The LCU (Local Control Unit) is installed to front mode door motor so as to
perform the multiplex communication control (LIN).
Refer to

HAC-18, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM :

Door Control"

.

Intake sensor

Intake sensor measures temperature of front evaporator fin temperature.
The sensor uses a thermistor which is sensitive to the change in tempera-
ture. The electrical resistance of the thermistor decreases as temperature
increases.

Upper ventilator door motor

The LCU (Local Control Unit) is installed to upper ventilator door motor so
as to perform the multiplex communication control (LIN).
Refer to

HAC-18, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM :

Door Control"

.

IPDM E/R

A/C relay is integrated in IPDM E/R. IPDM E/R operates A/C relay when A/
C compressor request signal is received from ECM via CAN communica-
tion line.

Magnet clutch

The magnet clutch is the device that drives the compressor with the signal
from IPDM E/R. Compressor is driven by the magnet clutch which is mag-
netized by electric power supply. IPDM controls magnet clutch by turning
the built in A/C relay to ON

⇔

OFF according to ECM request.

Preset switch

Preset switch is integrated with front A/C control and AV operation switch.
Front A/C control operation signal is transmitted from preset switch to AV
control unit via communication line.

Refrigerant pressure sensor

Refer to

HAC-13

.

Sunload sensor

Sunload sensor measures sunload amount. This sensor is a dual system
so that sunload for driver side and passenger side are measured separate-
ly. This sensor converts sunload amount to voltage signal by photodiode
and transmits to A/C auto amp..

Component

Description

COMPONENT PARTS

HAC-9

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

C

D

E

F

G

H

J

K

L

M

A

B

HAC

N

O

P

REAR AUTOMATIC AIR CONDITIONING SYSTEM : Component Parts Location

INFOID:0000000006275850

1.

Rear A/C control

2.

Preset switch

3.

Engine coolant temperature sensor
Refer to

EC-16, "Component Parts

Location"

.

4.

ECM
Refer to

EC-16, "Component Parts

Location"

.

5.

Ambient sensor

6.

AV control unit
Refer to

AV-9, "Component Parts Lo-

cation"

.

7.

Combination meter
Refer to

MWI-6, "METER SYSTEM :

Component Parts Location"

.

8.

Sunload sensor

9.

Front display

10. Rear mode door motor

11. Rear air mix door motor

12. Rear in-vehicle sensor

13. Rear blower motor

14. Rear A/C solenoid valve

15. Rear A/C relay

16. Intake sensor

17. A/C auto amp.

A.

Right side of rear A/C unit assembly

B.

Left side of rear A/C unit assembly

C.

Back side of engine room (RH)

D.

Left side of heater & cooling unit as-
sembly

E.

Cluster lid C is removed

JMIIA0813ZZ

HAC-10

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

COMPONENT PARTS

REAR AUTOMATIC AIR CONDITIONING SYSTEM : Component Description

INFOID:0000000006275851

ACCS (ADVANCED CLIMATE CONTROL SYSTEM)

Component

Description

Ambient sensor

Ambient sensor measures ambient air temperature. The sensor uses a
thermistor which is sensitive to the change in temperature. The electrical
resistance of the thermistor decreases as temperature increases.

AV control unit

AV control unit transmits front A/C control operation signal to A/C auto amp.
via CAN communication line.

A/C auto amp.

A/C auto amp. controls rear automatic air conditioning system by inputting
and calculating signals from each sensor and each switch. A/C auto amp.
has self-diagnosis function. Diagnosis of rear automatic air conditioning
system can be performed quickly.

Combination meter

Combination meter transmits vehicle speed signal to A/C auto amp. via
CAN communication line.

ECM

ECM transmits engine coolant temperature signal to A/C auto amp. via
CAN communication line.

Engine coolant temperature sensor

Engine coolant temperature sensor measures engine coolant temperature.
The sensor uses a thermistor which is sensitive to the change in tempera-
ture. The electrical resistance of the thermistor decreases as temperature
increases.

Front display

Front display indicates operation status of rear automatic air conditioning
system.

Heater & cooling unit
assembly

Intake sensor

Intake sensor measures temperature of front evaporator fin temperature.
The sensor uses a thermistor which is sensitive to the change in tempera-
ture. The electrical resistance of the thermistor decreases as temperature
increases.

Preset switch

Preset switch is integrated with front A/C control and AV operation switch.
Front A/C control operation signal is transmitted from preset switch to AV
control unit via communication line.

Rear A/C control

The operation of the rear A/C control is communicated with the A/C auto
amp. via communication line.

Rear A/C relay

Power is supplied to the rear A/C solenoid valve through rear A/C relay with
A/C auto amp. control.

Rear A/C unit assem-
bly

Rear air mix door motor

The LCU (Local Control Unit) is installed to rear air mix door motor so as to
perform the multiplex communication control (LIN).
Refer to

HAC-26, "REAR AUTOMATIC AIR CONDITIONING SYSTEM :

Door Control"

.

Rear A/C solenoid valve

Rear A/C solenoid valve operates by power supply from rear A/C relay and
opens refrigerant line to rear evaporator.

Rear blower motor

Refer to

HAC-13

.

Rear in-vehicle sensor

Rear in-vehicle sensor measures temperature of intake air that flows
through rear blower motor to passenger room. The sensor uses a ther-
mistor which is sensitive to the change in temperature. The electrical resis-
tance of the thermistor decreases as temperature increases.

Rear mode door motor

The LCU (Local Control Unit) is installed to rear mode door motor so as to
perform the multiplex communication control (LIN).
Refer to

HAC-26, "REAR AUTOMATIC AIR CONDITIONING SYSTEM :

Door Control"

.

Sunload sensor

Sunload sensor measures sunload amount. This sensor is a dual system
so that sunload for driver side and passenger side are measured separate-
ly. This sensor converts sunload amount to voltage signal by photodiode
and transmits to A/C auto amp..