Nissan Primera P11. Instruction — part 483
IN-VEHICLE SENSOR
The in-vehicle sensor is attached to the right side of the control
unit. It converts variations in the temperature of the compartment
air drawn in by the aspirator into a resistance value, which is then
input into the auto amplifier.
After disconnecting in-vehicle sensor harness connector, mea-
sure resistance between terminals
p
1
and
p
2
at sensor har-
ness side, using the table below.
Temperature °C (°F)
Resistance k
Ω
0 (32)
6.0
5 (41)
4.95
10 (50)
3.99
15 (59)
3.24
20 (68)
2.65
25 (77)
2.19
30 (86)
1.81
35 (95)
1.51
40 (104)
1.27
Aspirator
The aspirator is located in front of heater unit. It produces
vacuum pressure due to air discharged from the heater unit,
continuously taking compartment air in the aspirator.
KHA128
PTC Output voltage
Set temperature
(°C)
Output
voltage
NHA295
In-vehicle
sensor
NHA287
In-vehicle
sensor
In-vehicle
sensor
NHA312
Aspirator
duct
Aspirator
SYSTEM DESCRIPTION
AUTO
Control System Input Components (Cont’d)
HA-85
AMBIENT SENSOR
The ambient sensor is located on the hood lock stay. It detects
the ambient temperature and converts it into a resistance value,
which is then input into the auto amplifier.
After disconnecting ambient sensor harness connector, measure
resistance between terminals
p
1
and
p
2
at sensor harness
side, using the table below.
Temperature °C (°F)
Resistance k
Ω
−20 (−4)
9.98
−10 (14)
5.57
0 (32)
3.26
10 (50)
1.98
20 (68)
1.25
25 (77)
1.00
30 (86)
0.81
40 (104)
0.54
SUNLOAD SENSOR
The sunload sensor is located on the center defroster grille. It
detects sunload entering through the windshield by means of a
photo diode and converts it into a current value which is then
input to the auto amplifier.
RHA979G
Aspirator
Aspirator duct
Heater unit case
NHA313
Ambient sen-
sor
NHA288
Ambient sensor
harness connector
Ambient
sensor
NHA314
Sunload
sensor
SYSTEM DESCRIPTION
AUTO
Control System Input Components (Cont’d)
HA-86
Measure voltage between terminals
p
5
and
p
6
at auto air con-
ditioner harness side, using the table below.
Input current
mA
Output voltage
V
0
5.00
0.1
4.09
0.2
3.18
0.3
2.27
0.4
1.36
0.5
0.45
●
When checking sunload sensor, select a place where
sun shines directly on it.
A/C RELAY
The A/C relay is located on the left side of the engine room.
When the A/C remain and fan switch are ON, the A/C relay
operates and transmits A/C operation signals to ECM.
Control System Auto Amplifier (Auto amp.)
The auto amplifier has a built-in microcomputer which processes
the information sent from the various sensors needed for air
conditioner operation. The air mix door motor and blower motor
are then controlled.
Signals from the various switches and the Potentio Temperature
Control (PTC) are directly entered into the auto amplifier.
SUNLOAD INPUT PROCESS
The auto amp. also includes a processing circuit which “aver-
ages” the variations in detected sunload over a period of time.
This prevents drastic swings in the ATC system operation due to
small or quick variations in detected sunload.
For example, consider driving along a road bordered by an occa-
sional group of large trees. The sunload detected by the sunload
sensor will vary whenever the trees obstruct the sunlight. The
processing circuit averages the detected sunload over a period
of time, so that the (insignificant) effect of the trees momentarily
obstructing the sunlight does not cause any change in the ATC
NHA289
Auto amplifier
Auto amp.
connector
Auto amp.
connector
NHA298
.
A/C Relay
RHA024H
Auto amplifier
SYSTEM DESCRIPTION
AUTO
Control System Input Components (Cont’d)
HA-87
system operation. On the other hand, shortly after entering a
long tunnel, the system will recognize the change in sunload, and
the system will react accordingly.
SUNLOAD COMPENSATION
The auto amplifier compensates for sunload by altering the air
mix door position and air flow volume according to the amount
of sunload detected by the sunload sensor. When the amount of
sunload is great, the air mix door is moved toward the “COLD”
side. Along with this air mix door movement, air flow volume will
also be changed.
YHA296
A/C control panel PTC
In-vehicle sensor
Ambient sensor
Sunload sensor
Sunload com-
pensation
Auto amplifier
Air mix door posi-
tion arithmetic cir-
cuit
Air flow volume
arithmetic circuit
Air mix door motor
LOW, MED, HIGH
and AUTO relays
SHA493CA
Air
mix
door
position
compensation
amount
Sunload kW (kcal/h, BTU/h)/m
2
[kW (kcal/h,BTU/h)/sq ft]
Sunload compensation specifications
0.768 (660, 2,619)
[0.0713 (61.31, 243.3)]
SYSTEM DESCRIPTION
AUTO
Control System Auto Amplifier (Auto amp.)
(Cont’d)
HA-88
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