Nissan Quest E52. Manual - part 720

HAC-10

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

COMPONENT PARTS

BLOWER UNIT ASSEMBLY : Intake Door Motor

INFOID:0000000009652490

• Intake door motor consists of motor that drives door, PBR (Potentio Balance Register) that detects door

position and LCU (Local Control Unit) that performs multiplex communication control (LAN) with A/C auto
amp. Refer to 

HAC-20, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Door Control"

.

• Rotation of motor is transmitted to intake door, then air inlet is switched.

BLOWER UNIT ASSEMBLY : Front Blower Motor

INFOID:0000000009652491

• The front blower motor utilizes a brush-less motor with a rotating

magnet. Quietness is improved over previous motors that rotates
coil while brush functions as contact points.

• Rotation speed is changed according to front blower motor control

signal (duty ratio) from A/C auto amp.

HEATER & COOLING UNIT ASSEMBLY

HEATER & COOLING UNIT ASSEMBLY : Aspirator

INFOID:0000000009652492

The aspirator generates the vacuum by the air blown from the heater
& cooling unit case and draws the air of the passenger room to the
front in-vehicle sensor area via the aspirator duct.

RJIA2467J

ZHA152H

RJIA1804E

COMPONENT PARTS

HAC-11

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

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HEATER & COOLING UNIT ASSEMBLY : Intake Sensor

INFOID:0000000009652493

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

HEATER & COOLING UNIT ASSEMBLY : Front Air Mix Door Motor (Driver side)

INFOID:0000000009652494

• Front air mix door motor (driver side) consists of motor that drives door, PBR (Potentio Balance Register)

that detects door position and LCU (Local Control Unit) that performs multiplex communication control (LAN)
with A/C auto amp. Refer to 

HAC-20, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Door Control"

.

• Rotation of motor is transmitted to front air mix door (driver side), then air flow temperature (driver side) is

switched.

HEATER & COOLING UNIT ASSEMBLY : Front Air Mix Door Motor (Passenger side)

INFOID:0000000009652495

• Front air mix door motor (passenger side) consists of motor that drives door, PBR (Potentio Balance Regis-

ter) that detects door position and LCU (Local Control Unit) that performs multiplex communication control
(LAN) with A/C auto amp. Refer to 

HAC-20, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Door

Control"

.

• Rotation of motor is transmitted to front air mix door (passenger side), then air flow temperature (passenger

side) is switched.

HEATER & COOLING UNIT ASSEMBLY : Front Mode Door Motor

INFOID:0000000009652496

• Front mode door motor consists of motor that drives door, PBR (Potentio Balance Register) that detects door

position and LCU (Local Control Unit) that performs multiplex communication control (LAN) with A/C auto
amp. Refer to 

HAC-20, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Door Control"

.

• Rotation of motor is transmitted to front mode door (ventilator door, max. cool door, defroster door and foot

door) by lever, link, and rod, then air outlet is switched.

REAR A/C UNIT ASSEMBLY

REAR A/C UNIT ASSEMBLY : Rear In-vehicle Sensor

INFOID:0000000009652497

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

REAR A/C UNIT ASSEMBLY : Rear Air Mix Door Motor

INFOID:0000000009652498

• Rear air mix door motor consists of motor that drives door, PBR (Potentio Balance Register) that detects

door position and LCU (Local Control Unit) that performs multiplex communication control (LAN) with A/C
auto amp. Refer to 

HAC-20, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Door Control"

.

• Rotation of motor is transmitted to rear air mix door by lever, then air flow temperature is switched.

JMIIA1761GB

JMIIA1765GB

HAC-12

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

COMPONENT PARTS

REAR A/C UNIT ASSEMBLY : Rear Mode Door Motor

INFOID:0000000009652499

• Rear mode door motor consists of motor that drives door, PBR (Potentio Balance Register) that detects door

position and LCU (Local Control Unit) that performs multiplex communication control (LAN) with A/C auto
amp. Refer to 

HAC-20, "FRONT AUTOMATIC AIR CONDITIONING SYSTEM : Door Control"

.

• Rotation of motor is transmitted to rear mode door by lever, then air outlet is switched.

REAR A/C UNIT ASSEMBLY : Rear Blower Motor

INFOID:0000000009652500

• The rear blower motor utilizes a brush-less motor with a rotating

magnet. Quietness is improved over previous motors that rotates
coil while brush functions as contact points.

• Rotation speed is changed according to rear blower motor control

signal (duty ratio) from A/C auto amp.

Front A/C Control (A/C Auto Amp.)

INFOID:0000000009652501

• Front A/C control has switches and display that can set and indi-

cate the operation of front automatic air conditioning system, rear
automatic air conditioning system, and ACCS (Advanced Climate
Control System).

• Front A/C control integrates A/C auto amp. A/C auto amp. controls

front automatic air conditioning system, rear automatic air condi-
tioning system, and ACCS (Advanced Climate Control System), by
receiving and calculating signal from each sensor and switch. A/C
auto amp. has self-diagnosis function. Diagnosis of air conditioning
system can be performed quickly.

Rear A/C Control

INFOID:0000000009652502

Rear A/C control has switches and display that can set and indicate
the operation of rear automatic air conditioning system. Rear A/C
control transmits setting status to A/C auto amp. via communication
line. A/C auto amp. controls rear automatic air conditioning system.

RJIA2467J

ZHA152H

JMIIA1762ZZ

JMIIA1763ZZ

COMPONENT PARTS

HAC-13

< SYSTEM DESCRIPTION >

[AUTOMATIC AIR CONDITIONING]

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Ambient Sensor

INFOID:0000000009652503

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.

Front In-vehicle Sensor

INFOID:0000000009652504

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 resis-
tance of the thermistor decreases as temperature increases.

Sunload Sensor

INFOID:0000000009652505

Sunload sensor measures sunload amount. This sensor converts
sunload amount to voltage signal by photodiode and transmits it to
A/C auto amp.

Refrigerant Pressure Sensor

INFOID:0000000009652506

DESCRIPTION

• The refrigerant pressure sensor converts high-pressure side refrigerant pressure into voltage and transmits

it to ECM.

• ECM operates cooler cycle protection and cooling fan speed control according to voltage value that is input.

STRUCTURE AND OPERATION

JMIIA1719GB

JMIIA1766GB

JMIIA1722GB

PBIB2657E