Nissan Primera P11. Instruction — part 467
Control Operation
The control system consist of a) input sensors and switches, b) the automatic amplifier (microcomputer), and
c) outputs.
The relationship of these components is shown in the diagram below:
KHA111
Control unit
●
Set temperature Control
(Potentio temperature control)
Ambient sensor
In-vehicle sensor
Sunload sensor
Thermal transmitter
Automatic
amplifier
(Micro- com-
puter)
Air mix door motor
PBR
(Potentio Balance Resis-
tor)built-into air mix door
motor
Fan
Air mix door
Blower motor
KHA112
Auto air conditioner
Air conditioner switch
Mode control knob
Auto switch
Fan control
Recirculation
switch
Rear window
defogger switch
Temperature control
switch (PTC)
DESCRIPTION
AUTO
HA-21
FAN CONTROL SWITCH
Instruction control of the blower speed. Four speeds are available for instruction control (as shown on the display
screen):
low
I
, medium low
I
I
, medium high
I
I
I
, high
I
I
I
I
MODE CONTROL KNOB
This knob controls outlet air flow.
In “DEF” (
) mode, the intake door is set to “FRESH”, and the A/C on.
AUTO SWITCH
The air mix door, and blower speed are automatically controlled so that the in-vehicle temperature will reach,
and be maintained at the set temperature selected by the operator.
TEMPERATURE CONTROL SWITCH (POTENTIO TEMPERATURE CONTROL)
Increases or decreases the set temperature.
RECIRCULATION (REC) SWITCH
OFF position: Outside air is drawn into the passenger compartment.
ON position: Interior air is recirculated inside the vehicle.
RECIRC is canceled when DEF mode is selected.
AIR CONDITIONING SWITCH
The air conditioner switch controls the A/C system. When the switch is depressed with the fan ON, the
compressor will turn ON. The display screen indicates “A/C”.
A/C switch will turn on when DEF mode is selected.
The air conditioner cooling function operates only when the engine is running.
DESCRIPTION
AUTO
Control Operation (Cont’d)
HA-22
Discharge Air Flow
KHA113
p
1
: Ventilation
p
2
: Foot
p
3
: Defroster
★
: Air flow in REC position
p
3
p
3
p
3
p
3
Vent
Foot
p
3
To defroster
p
2
To floor
p
2
To floor
Foot and defroster
p
3
To defroster
p
2
To floor
p
2
To floor
Outside air
Defroster
p
3
To defroster
Outside air
p
1
To ventilator
Defroster door
Fresh vent door
Heater core
Intake air
★
Intake door
Air mix door
Floor door
Ventilator door
Bi-level
p
1
To ventilator
p
2
To floor
p
2
To floor
This illustration is for LHD models.
The layout for RHD models issymmetrically opposite.
Outside air
Air passed through heater core
Mixed air (
+
)
Air not passed through heater core
p
2
Outside air
DESCRIPTION
AUTO
HA-23
Operational Check
The purpose of the operational check is to confirm that the sys-
tem operates as it should. The systems which are checked are
the blower, mode (discharge air), intake air, temperature
decrease, temperature increase.
CONDITIONS:
Engine running at normal operating temperature.
PROCEDURE:
1. Check blower
1) Turn fan control knob to 1-speed.
Blower should operate on 1-speed.
2) Then turn fan control knob to 2-speed.
3) Continue checking blower speed until all four speeds are
checked.
4) Leave blower on 4-speed.
2. Check discharge air
1) Turn mode control knob.
2) Confirm that discharge air comes out according to the air
distribution table at left.
Refer to “Discharge Air Flow” in “DESCRIPTION” (HA-23).
KHA106
KHA107
KHA032
Discharge airflow
Switch
mode/
indicator
Airoutlet/distribution
Face
Foot
Defroster
100%
—
—
60%
40%
—
15%*
65%
20%
15%*
55%
30%
15%*
—
85%
* Face air from SIDE VENT only
TROUBLE DIAGNOSES
HEATER
HA-24
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