Nissan Quest E52. Instruction — 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.
3.
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.
4.
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.
5.
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.
6.
Rear A/C control
7.
Combination meter
Combination meter transmits engine coolant temperature signal to A/C amp.
8.
Front A/C control (A/C amp.)
HAC-160, "Front A/C Control (A/C Amp.)"
9.
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]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
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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 instruction air conditioning system.
• Front A/C control integrates A/C amp. A/C amp. controls front
instruction 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 instruction 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]
C
D
E
F
G
H
J
K
L
M
A
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HAC
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• 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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