Nissan Quest E52. Instruction — part 758
HAC-162
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONING]
SYSTEM
SYSTEM
FRONT MANUAL AIR CONDITIONING SYSTEM
FRONT MANUAL AIR CONDITIONING SYSTEM : System Description
INFOID:0000000009652625
SYSTEM DIAGRAM
DESCRIPTION
• Front instruction air conditioning system is controlled by each function of A/C amp., BCM, ECM and IPDM E/R.
• Each operation of front air conditioning can be controlled by front A/C control (built-in A/C amp.).
CONTROL BY A/C AMP.
•
HAC-163, "FRONT MANUAL AIR CONDITIONING SYSTEM : Air Flow Control"
•
HAC-163, "FRONT MANUAL AIR CONDITIONING SYSTEM : Air Inlet Control"
•
HAC-163, "FRONT MANUAL AIR CONDITIONING SYSTEM : Compressor Control"
•
HAC-164, "FRONT MANUAL AIR CONDITIONING SYSTEM : Door Control"
• Correction for input value
Intake temperature correction
- A/C amp. inputs the temperature detected by intake sensor as the intake temperature (front evaporator tem-
perature).
- A/C amp. performs the correction of the temperature detected by intake sensor for front air conditioning con-
trol.
- A/C amp. performs the correction so that the recognition intake temperature changes depending on the dif-
ference between the detected intake temperature and the recognition intake temperature. If the difference is
large, the changing is early. The changing becomes slow as the difference becomes small.
CONTROL BY BCM
•
HAC-163, "FRONT MANUAL AIR CONDITIONING SYSTEM : Compressor Control"
CONTROL BY ECM
•
HAC-163, "FRONT MANUAL AIR CONDITIONING SYSTEM : Compressor Control"
JMIIA1789GB
SYSTEM
HAC-163
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONING]
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• Cooling fan control. Refer to
EC-45, "COOLING FAN CONTROL : System Description"
CONTROL BY IPDM E/R
•
HAC-163, "FRONT MANUAL AIR CONDITIONING SYSTEM : Compressor Control"
• Cooling fan control. Refer to
PCS-5, "RELAY CONTROL SYSTEM : System Description"
FRONT MANUAL AIR CONDITIONING SYSTEM : Air Flow Control
INFOID:0000000009652626
DESCRIPTION
• A/C amp. changes duty ratio of front blower motor control signal to control air flow continuously. When air
flow is increased, duty ratio of front blower motor control signal gradually increases to prevent a sudden
increase in air flow.
• In addition to instruction control, air flow control is compose of fan speed control at door motor operation.
FAN SPEED CONTROL AT DOOR MOTOR OPERATION
When front mode door motor is activated while air flow is more than the specified value, A/C amp. reduces
temporarily fan speed so that front mode door moves smoothly.
FRONT MANUAL AIR CONDITIONING SYSTEM : Air Inlet Control
INFOID:0000000009652627
A/C amp. controls air inlet to fresh air intake (FRE), when engine coolant temperature is 105
°
C (221
°
F) or
more.
FRONT MANUAL AIR CONDITIONING SYSTEM : Compressor Control
INFOID:0000000009652628
DESCRIPTION
• When the compressor activation condition is satisfied while front blower motor is activated, A/C amp. trans-
mits A/C ON signal and blower fan ON signal to BCM.
• BCM transmits the A/C ON signal and blower fan ON signal to ECM via CAN communication line. Refer to
BCS-12, "SIGNAL BUFFER SYSTEM : System Description"
• ECM judges the conditions of each sensor (refrigerant pressure sensor signal, accelerator position signal,
etc.), and transmits the A/C compressor request signal to IPDM E/R via CAN communication line.
• By receiving the A/C compressor request signal from ECM, IPDM E/R turns the A/C relay to ON, and acti-
vates the compressor. Refer to
PCS-5, "RELAY CONTROL SYSTEM : System Description"
CONTROL BY A/C AMP.
Low Temperature Protection Control
When intake sensor detects that front evaporator fin temperature is
2.5
°
C (37
°
F) or less, A/C amp. requests ECM to turn the compressor
OFF, and stops the compressor.
When the front evaporator fin temperature returns to 4.0
°
C (39
°
F) or
more, the compressor is activated.
CONTROL BY ECM
Compressor Protection Control at Pressure Malfunction
When the high-pressure side value that is detected by refrigerant pressure sensor is as per the following state,
ECM requests IPDM E/R to turn A/C relay OFF and stops the compressor.
• 3.12 MPa (31.8 kg/cm
2
, 452 psi) or more (When the engine speed is less than 1,500 rpm)
• 2.74 MPa (27.9 kg/cm
2
, 397 psi) or more (When the engine speed is 1,500 rpm or more)
• 0.14 MPa (1.4 kg/cm
2
, 20 psi) or less
Compressor Oil Circulation Control
When the engine starts while the engine coolant temperature is 56
°
C (133
°
F) or less, ECM activates the com-
pressor for approximately 6 seconds and circulates the compressor oil once.
JMIIA1774GB
HAC-164
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONING]
SYSTEM
Air Conditioning Cut Control
When the engine condition is high load, ECM transmit A/C relay OFF request to IPDM E/R, and stops the
compressor. Refer to
EC-43, "AIR CONDITIONING CUT CONTROL : System Description"
.
FRONT MANUAL AIR CONDITIONING SYSTEM : Door Control
INFOID:0000000009652629
DOOR MOTOR CONTROL
• LCU (Local Control Unit) is built into each door motor. And detects door position by PBR (Potentio Balance
Resistor).
• A/C amp. communicates with each LCU via communication line. And receives each door position feedback
signal from each LCU.
• Each LCU controls each door to the appropriate position depending on the control signal from A/C amp.
• Each LCU transmits the signal of door movement completion to A/C amp., when the door movement is com-
pleted.
SWITCH AND THEIR CONTROL FUNCTION
JMIIA1777GB
JMIIA1778ZZ
SYSTEM
HAC-165
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONING]
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AIR DISTRIBUTION
1.
Intake door
2.
Front blower motor
3.
In-cabin microfilter
4.
Front evaporator
5.
Front air mix door
6.
Front heater core
7.
Foot door
8.
Ventilator door
9.
Defroster door
10. Max. cool door
Fresh air
Recirculation air
Discharge air
Defroster
Center ventilator
Side ventilator
Front foot
Rear foot
Switch position
Door position
Front mode door
In
ta
ke
do
or
Fro
n
t ai
r m
ix
do
or
V
e
nt
ila
to
r do
or
Ma
x. co
ol
d
o
o
r
Def
ros
te
r do
or
Fo
ot
do
or
MODE switch
A
A
A
A
—
—
B
B
A
B
C
C
B
B
C
B
B
B
DEF switch
C
A
C
C
REC switch
—
—
—
—
A
FRE switch
B
Temperature control switch
Full cold
—
A
Full hot
B
ON·OFF switch
OFF
C
C
B
B
—
Discharge air flow
MODE/DEF set po-
sition
Air outlet/distribution
Ventilator
Foot
Defroster
Center
Side
Front
Rear
50%
50%
—
—
26%
30%
30%
14%
—
—
14%
40%
16.5%
29.5%
—
14%
35%
16%
35%
—
12%
—
88%
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