Nissan Juke F15. Instruction — part 845
SYSTEM
HAC-15
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONING]
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If the engine coolant temperature is 56
°C (133°F) or less, to prevent
a cold discharged air flow, A/C auto amp. suspends blower motor
activation for the maximum 150 seconds depending on target air mix
door opening angle. After this, voltage of blower motor is increased
gradually, and blower motor is activated.
FAN SPEED CONTROL AT DOOR MOTOR OPERATION
When mode door motor is activated while air flow is more than the specified value, A/C auto amp. reduces
temporarily fan speed so that mode door moves smoothly.
HIGH IN- TEMPERATURE STARTING CONTROL
When evaporator temperature is high [intake air temperature sensor value is 35
°C (95°F) or more], to prevent
a hot discharged air flow, A/C auto amp. suspends blower motor activation for approximately 3 seconds so
that evaporator is cooled by refrigerant.
Air Inlet Control
INFOID:0000000012200013
• While air inlet is in automatic control, A/C auto amp. selects air
inlet (fresh air intake, 20% fresh air intake, or recirculation)
depending on set temperature, in-vehicle temperature, and ambi-
ent temperature.
NOTE:
Air inlet is fixed to REC, when the ambient temperature is 21
°C
(70
°F) or more.
• Air inlet is fixed to 80% FRE, only when the conditions are satisfied
as follows:
- Air inlet is FOOT or D/F
- Ambient temperature is 2
°C (36°F) or less
- Maximum fan speed
Compressor Control
INFOID:0000000012200014
DESCRIPTION
• When the compressor activation condition is satisfied while blower motor is activated, A/C auto 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-7, "RELAY CONTROL SYSTEM : System Description"
CONTROL BY A/C AUTO AMP.
Low Temperature Protection Control
When intake sensor detects that evaporator fin temperature is 2
°C
(36
°F) or less, A/C auto amp. requests ECM to turn the compressor
OFF, and stops the compressor.
When the air temperature returns to 3.5
°C (38°F) or more, the com-
pressor is activated.
JMIIA1227GB
JMIIA0711GB
JMIIA1055GB
HAC-16
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONING]
SYSTEM
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 (31.82 kg/cm
2
, 452.4 psi) or more (When the engine speed is less than 1,500 rpm)
• 2.74 MPa (27.95 kg/cm
2
, 397.3 psi) or more (When the engine speed is 1,500 rpm or more)
• 0.14 MPa (1.43 kg/cm
2
, 20.3 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.
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-63, "AIR CONDITIONING CUT CONTROL : System Description"
.
Door Control
INFOID:0000000012200015
DOOR MOTOR CONTROL
• A/C auto amp. receives the detection data from each sensor.
• Intake door motor, when receiving control signal from A/C auto amp. moves intake door to the appropriate
position based on the door position detection signal of each PBR (Potentio Balance Resistor).
• Each motor of air mix and mode, when receiving drive signal from A/C auto amp., moves each door to the
appropriate position according to drive signal.
DRIVE METHOD OF STEPPING MOTOR TYPE MOTOR
• Stepping motor type motor is driven by 4 pieces of drive coil that are sequentially excited.
• Direction of rotation is changeable by recomposing pattern of excitation.
SWITCH AND THEIR CONTROL FUNCTION
SJIA0971E
SYSTEM
HAC-17
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONING]
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*: Models for Canada
1.
Intake door
2.
Blower motor
3.
In-cabin microfilter filter
4.
Evaporator
5.
Upper air mix door
6.
Lower air mix door
7.
Heater core
8.
Foot door
9.
Side ventilator door
10. Sub defroster door
11. Center ventilator and defroster door
Fresh air intake
Recirculation air
Defroster
Center ventilator
Side ventilator
Foot
Rear foot
*
Switch/dial position
Door position
Ce
nt
er
ve
nt
ila
to
r an
d d
ef
ros
ter do
or
Su
b d
ef
ros
ter
do
or
Si
de
ve
nt
ila
tor do
or
Fo
ot
do
or
In
ta
ke
do
or
Up
pe
r ai
r mi
x
do
or
L
owe
r ai
r mi
x
do
or
AUTO switch
AUTO
JPIIA1584ZZ
HAC-18
< SYSTEM DESCRIPTION >
[AUTOMATIC AIR CONDITIONING]
SYSTEM
AIR DISTRIBUTION
Models except for Canada
Models for Canada
MODE switch
VENT
P
M
L
G
—
—
—
B/L
N
K
H
FOOT
Q
O
J
I
D/F
N
DEF switch
M
G
Intake switch
—
—
—
—
A
B
Temperature control dial
Full cold
18
°C (60°F)
—
D
E
18.5
°C (61°F) –
31.5
°C (89°F)
AUTO
AUTO
Full hot
32
°C (90°F)
C
F
OFF switch
Q
O
J
I
B
—
—
Switch/dial position
Door position
Ce
nte
r v
en
tila
to
r an
d
de
fros
te
r do
or
Su
b de
fr
os
te
r do
or
Si
de
v
ent
ila
to
r do
or
Fo
ot
do
or
In
ta
ke
do
or
Up
pe
r ai
r mi
x do
or
Lo
we
r ai
r mi
x do
or
Discharge air flow
MODE/DEF setting po-
sition
Air outlet/distribution
Ventilator
Foot
Defroster
Center
Side
52.6%
47.3%
—
—
34.0%
27.7%
38.4%
—
—
19.1%
57.9%
23.0%
—
13.5%
42.4%
44.1%
—
16.3%
—
83.8%
Discharge air flow
MODE/DEF setting
position
Air outlet/distribution
Ventilator
Foot
Defroster
Center
Side
Front
Rear
52.6%
47.3%
—
—
—
28.2%
25.9%
29.6%
16.3%
—
—
16.3%
43.0%
21.0%
19.7%
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