Nissan Sentra. Manual — part 569
HAC-124
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONER]
SYSTEM
• Direction of rotation is changeable by recomposing pattern of excitation.
MODE DOOR MOTOR
DESCRIPTION
• The step motor system is adopted for mode door motor.
• When a drive signal is input from A/C auto amp. to door motor, a step motor built into the door motor rotates
according to the drive signal, and then stops at the target door position.
• Rotation of motor is transmitted to mode door (center ventilator and defroster door, sub defroster door, side
ventilator door, and foot door) by link, rod, and lever, then air outlet is switched.
DRIVE METHOD
• The 4 drive coils are excited in sequence in order to drive the motor.
• Direction of rotation is changeable by recomposing pattern of excitation.
INTAKE DOOR MOTOR
• Motor operates intake door according to control signal from A/C auto amp.
• Rotation of motor is transmitted to intake door by lever, then air inlet is switched.
SWITCHES AND THEIR CONTROL FUNCTION
JSIIA1655GB
JZIIA0033GB
SYSTEM
HAC-125
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONER]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Intake door
Blower motor
Air conditioner filter
Evaporator
Upper air mix door (driver side/pas-
senger side)
Lower air mix door (driver side/pas-
senger side)
Heater core
Foot door
Side ventilator door
Sub defroster door
Center ventilator and defroster door
Fresh air intake
Recirculation air
Discharge air
Defroster
Center ventilator
Side ventilator
Rear ventilator
Front foot
Rear foot
JMIIA1958ZZ
HAC-126
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONER]
SYSTEM
AIR DISTRIBUTION
Temperature Control
INFOID:0000000009757731
• When the ignition switch is in the ON position, the customer uses the front air control temperature control
dial to set the desired temperature.
• The front air control calculates the target front air mix door opening angle depending on the selected temper-
ature, intake temperature sensor, engine coolant temperature and rpm, and ambient temperature.
• Front air mix door is controlled depending on the comparison of current front air mix door opening angle and
target front air mix door opening angle.
• Regardless of ambient temperature, the front air mix door is fixed at the fully cold position when the temper-
ature control dial is set at the full cold position and fixed at the fully hot position when the temperature control
dial is set at the full hot position.
Switch position
Door position
Mode door
In
ta
ke
do
or
Air mix door
Ce
nt
er
v
en
til
at
or
a
nd
de
fr
ost
er
do
or
S
ub
de
fros
te
r do
or
Si
de
v
en
til
at
or
do
or
Fo
ot doo
r
Up
pe
r a
ir m
ix
do
or
Lo
wer ai
r mi
x d
o
or
MODE switch
—
—
—
DEF switch
REC switch
—
—
—
—
FRE switch
Temperature control switch
Full cold
18
°C
—
Full hot
32
°C
ON·OFF switch
OFF
—
—
Discharge air flow
MODE/DEF set-
ting position
Air outlet/distribution
Ventilator
Foot
Defroster
Front
Rear
Front
Rear
Center
Side
48.7%
37.4%
13.9%
—
—
—
26.6%
25.6%
13.2%
23.6%
11.0%
—
—
15.6%
16.9%
32.9%
16.3%
18.3%
—
13.4%
15.1%
27.0%
14.3%
30.2%
—
17.5%
18.8%
—
—
63.7%
OPERATION
HAC-127
< SYSTEM DESCRIPTION >
[MANUAL AIR CONDITIONER]
C
D
E
F
G
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HAC
N
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OPERATION
Switch Name and Function
INFOID:0000000009757732
A/C Switch Assembly
Switch Operation
1.
A/C switch
2.
Blower control dial (with OFF switch) 3.
DEF switch
4.
Rear DEF switch
5.
REC switch
6.
Temperature control dial
7.
MAX A/C switch
8.
D/F switch
9.
FOOT switch
10. B/L switch
11. VENT switch
ALIIA0604ZZ
A/C switch
Switches the compressor control switch indicator between ON
⇔ OFF with each press while front
blower fan is activated. The circuit used by the BCM to detect an A/C ON request is grounded.
NOTE:
When front blower fan is OFF, the compressor control cannot be activated.
Blower control dial (with
OFF switch)
• Blower fan speed is manually controlled with the dial for varying blower speed. When ON, the circuit
used by the BCM to detect a fan ON request signal is grounded.
• Turns air conditioning system OFF.
NOTE:
When blower control dial is turned to any ON position the air conditioning system is activated. (Com-
pressor control state returns to the previous state before air conditioning system was turned OFF.)
DEF switch
Switches DEF mode (switch indicator) between ON
⇔ OFF with each press.
• When DEF mode is turned ON, the air conditioning system changes to the following state.
- Air inlet: Fresh air intake
- Air outlet: DEF
- Blower fan: Manual setting.
- Compressor: ON
• When DEF mode is turned OFF, the air conditioning system state returns to the previous state be-
fore DEF mode was selected, but the following state is continued:
- Air inlet: Fresh air intake
- Compressor: ON
NOTE:
When front blower fan is OFF, DEF cannot be activated.
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