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Nissan Quest E52. Manual - part 757

HAC-158

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONING]

COMPONENT PARTS

BLOWER UNIT ASSEMBLY

BLOWER UNIT ASSEMBLY : Intake Door Motor

INFOID:0000000009652613

• 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 amp.
Refer to

HAC-164, "FRONT MANUAL 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:0000000009652614

• 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 amp.

ECM

ECM, when receiving A/C ON signal and blower fan ON signal from BCM, trans-
mits A/C compressor request signal to IPDM E/R via CAN communication ac-
cording to status of the engine and refrigerant pressure.
ECM transmits engine coolant temperature signal to combination meter via
CAN communication line.
Refer to

EC-15, "ENGINE CONTROL SYSTEM : Component Parts Location"

for detailed installation location.

IPDM E/R

A/C relay is integrated in IPDM E/R. IPDM E/R operates A/C relay when receiv-
ing A/C compressor request signal from ECM via CAN communication line.
Refer to

PCS-4, "IPDM E/R : Component Parts Location"

for detailed installation

location.

BCM

BCM transmits A/C ON signal and blower fan ON signal, received from A/C
amp., to ECM via CAN communication line.
Refer to

BCS-4, "BODY CONTROL SYSTEM : Component Parts Location"

for

detailed installation location.

Rear A/C control

HAC-160, "Rear A/C Control"

Combination meter

Combination meter transmits engine coolant temperature signal to A/C amp.

Front A/C control (A/C amp.)

HAC-160, "Front A/C Control (A/C Amp.)"

Rear mode door motor

HAC-159, "REAR A/C UNIT ASSEMBLY : Rear Mode Door Motor"

10.

Rear air mix door motor

HAC-159, "REAR A/C UNIT ASSEMBLY : Rear Air Mix Door Motor"

11.

Rear blower motor

HAC-160, "REAR A/C UNIT ASSEMBLY : Rear Blower Motor"

12.

Front mode door motor

HAC-159, "HEATER & COOLING UNIT ASSEMBLY : Front Mode Door Motor"

13.

Front air mix door motor

HAC-159, "HEATER & COOLING UNIT ASSEMBLY : Front Air Mix Door Motor"

14.

Intake sensor

HAC-159, "HEATER & COOLING UNIT ASSEMBLY : Intake Sensor"

15.

Intake door motor

HAC-158, "BLOWER UNIT ASSEMBLY : Intake Door Motor"

16.

Front blower motor

HAC-158, "BLOWER UNIT ASSEMBLY : Front Blower Motor"

No.

Component

Function

RJIA2467J

COMPONENT PARTS

HAC-159

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONING]

HAC

HEATER & COOLING UNIT ASSEMBLY

HEATER & COOLING UNIT ASSEMBLY : Intake Sensor

INFOID:0000000009652615

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

INFOID:0000000009652616

• Front 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
amp. Refer to

HAC-164, "FRONT MANUAL AIR CONDITIONING SYSTEM : Door Control"

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

HEATER & COOLING UNIT ASSEMBLY : Front Mode Door Motor

INFOID:0000000009652617

• 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 amp.
Refer to

HAC-164, "FRONT MANUAL 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 Air Mix Door Motor

INFOID:0000000009652618

• 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
amp. Refer to

HAC-164, "FRONT MANUAL AIR CONDITIONING SYSTEM : Door Control"

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

REAR A/C UNIT ASSEMBLY : Rear Mode Door Motor

INFOID:0000000009652619

• 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 amp.
Refer to

HAC-164, "FRONT MANUAL AIR CONDITIONING SYSTEM : Door Control"

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

ZHA152H

JMIIA1761GB

HAC-160

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONING]

COMPONENT PARTS

REAR A/C UNIT ASSEMBLY : Rear Blower Motor

INFOID:0000000009652620

• 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 amp.

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

INFOID:0000000009652621

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

cate the operation of front manual air conditioning system.

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

manual air conditioning system, by receiving and calculating signal
from each sensor and switch. A/C amp. has self-diagnosis func-
tion. Diagnosis of air conditioning system can be performed
quickly.

Rear A/C Control

INFOID:0000000009652622

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

Refrigerant Pressure Sensor

INFOID:0000000009652623

DESCRIPTION

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

it to ECM.

RJIA2467J

ZHA152H

JMIIA1762ZZ

JMIIA1763ZZ

COMPONENT PARTS

HAC-161

< SYSTEM DESCRIPTION >

[MANUAL AIR CONDITIONING]

HAC

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

STRUCTURE AND OPERATION

• The refrigerant pressure sensor is a capacitance type sensor. It consists of a pressure detection areas and a

signal processing area.

• The pressure detection area, which is a variable capacity condenser, changes internal static capacitance

according to pressure force.

• The signal processing area detects the static capacitance of the pressure detection area, converts the static

capacitance into a voltage value, and transmits the voltage value to ECM.

Magnet Clutch

INFOID:0000000009652624

DESCRIPTION

Compressor is driven by the magnet clutch which is magnetized by electric power supply.

STRUCTURE AND OPERATION

• Magnet clutch consists of pulley, clutch disc, and field coil.
- Pulley is connected with crankshaft pulley of engine via drive belt

and is always rotated while engine is running.

- Clutch disc is connected with drive shaft of compressor.
- Field coil, which becomes a strong electric magnet when electricity

is supplied, strongly pulls clutch disc and pressed it to pulley.

• When A/C relay integrated in IPDM E/R turns ON, electricity is

supplied to field coil, clutch disc is pressed to pulley, and engine
rotational movement is transmitted from crankshaft pulley

⇒

drive

belt

⇒

pulley

⇒

clutch disc

⇒

drive shaft. Compressor is operated.

When A/C relay turns OFF, electricity is not supplied to field coil,
and clutch disc is released from pulley. Compressor is not oper-
ated.

PBIB2657E

JMIIA1767GB

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