1998 ISUZU TROOPER Service Repair Manual

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Page 209 of 3573

ISUZU TROOPER 1998 Service Repair Manual AIR CONDITIONING 1BÐ83
<Indication>
¥ The Auto LED maintains unaffected.
¥ Currently selected intake port is
indicated.
5. Fan Switch
(1) Sets the fan to the specified mode.
(2) Even when the fan

Page 210 of 3573

ISUZU TROOPER 1998 Service Repair Manual 1BÐ84 AIR CONDITIONING
OVERVIEW OF CONSTRUCTION,
MOVEMENT AND CONTROL OF MAJOR
PARTS OF FULL AUTOMATIC AIR
CONDITIONER SYSTEM
Automatic Heater/Air Conditioner Control Unit
Equipped with the built-in

Page 211 of 3573

ISUZU TROOPER 1998 Service Repair Manual AIR CONDITIONING 1BÐ85
Legend
(1) Duct Sensor
(2) Evaporator Assembly
(3) Amplifierblock
In Car Sensor
It is a photodiode used for detecting quantity of
solar radiation. This sensor converts the off

Page 212 of 3573

ISUZU TROOPER 1998 Service Repair Manual 1BÐ86 AIR CONDITIONING
Legend
(1) Out put Axis
(2) Motor
(3) Printed Circuit Board
(4) Sliding Contact
The mode and mix actuators are common actuators
with the built-in potentiometer. For the intake

Page 213 of 3573

ISUZU TROOPER 1998 Service Repair Manual AIR CONDITIONING 1BÐ87
¥ Movement of Mode Actuator
As target position of the mode door is decided on
the controller of the control unit, the control unit
reads the position detection signal from th

Page 214 of 3573

ISUZU TROOPER 1998 Service Repair Manual 1BÐ88 AIR CONDITIONING
OVERVIEW OF AUTOMATIC CONTROL OF
FULL AUTOMATIC AIR CONDITIONER
The full automatic heater and air conditioner on this
vehicle has the following features:
¥ Interior temperatu

Page 215 of 3573

ISUZU TROOPER 1998 Service Repair Manual AIR CONDITIONING 1BÐ89
2. Air Flow Control
¥ In the Auto Mode
The automatic heater/air conditioner control unit
operates on the setup temperature signal and
other sensor signals to derive the total

AIR CONDITIONING 1BÐ89
2. Air Flow Control
¥ In the Auto Mode
The automatic heater/air conditioner control unit
operates on the setup temperature signal and
other sensor signals to derive the total signal.
Then, the control unit adjusts base potential of
the power transistor to match it to the voltage
pattern of the target fan so that stage-less fan
speed control can be achieved.
When solar radiation quantity is detected in the
VENT or B/L mode, the control unit increases the
minimum fan voltage to offset.
When FH or FC is selected from the temperature
control switch, air flow is accordingly fixed to
MAX HI or AUTO HI.
¥ In the Manual Mode
Air flow specified from the fan switch is entered
to the automatic heater/air conditioner control
unit as the manual signal. The signal modifies
the air flow to the level specified from the fan
switch so that the required fan voltage is
attained.3. Mode (Blow Port) Control
The automatic heater/air conditioner control unit
operates on the setup temperature from the
control switch, and temperature and solar
radiation quantify from the sensors to determine
the total mode control signal. According to the
pattern specified by this signal, the control unit
selects either one of the VENT, BI-LEVEL, FOOT
or DEF/FOOT mode.
The mode actuator determines the rotation
direction comparing the target position against
the current position being determined by the
position detection signal.
When FH or FC is selected for the temperature
from the temperature control switch, mode is
accordingly fixed to the VENT or FOOT.
¥ In the manual operation of the mode switch, you
can select a desired blow port mode pressing
the corresponding mode switch.
¥ Operating the DEF mode switch selects the DEF
for the blow port mode.
4.512
(V)
M
MAX
HI Relay
Power
transistor
4.8 10.5MAX HI Set up
temperature signal
Control unit
In car sensor
Ambient sensor
Sun sensor
Mode control
signal Fan switch
AUTO HI
Heater
sideCooler
side Total signalVENT mode
Blower fan motor terminal voltage
C01RY00008
Mode control
DEF / FOOTSet up temperature
signal
Mode actuator
Mode doorPosition
detection
switch
Control unit
In car sensor
Sun sensor
Air conditioning
switch
Mode control
signal Ambient sensor
FOOT
BI-LEVEL
VENT
Heater
sideCooler
side Mode total signal
C01RY00009

Page 216 of 3573

ISUZU TROOPER 1998 Service Repair Manual 1BÐ90 AIR CONDITIONING
4. Intake (Fresh air/interior air switching) Control
In the Full Auto mode, the automatic heater/air
conditioner control unit operates on the setup
temperature signal and other

1BÐ90 AIR CONDITIONING
4. Intake (Fresh air/interior air switching) Control
In the Full Auto mode, the automatic heater/air
conditioner control unit operates on the setup
temperature signal and other sensor input
signals to derive the total signal. According to
the pattern specified by this signal, the control
unit provides the intake control.
When the fan is turned off or the A/C (air
conditioning) is turned off, the intake is fixed to
the FRESH mode.
When FC or FH is selected from the control
switch, the intake mode is accordingly fixed to
the RECIRC or FRESH.
¥ In the Manual Operation
Pressing the FRESH (fresh air intake) or the
RECIRC (room air circulation) accordingly selects
the FRESH or RECIRC mode.
¥ When the DEF Mode Switch is depressed
The intake mode is fixed to the FRESH. When
the MANU REC is selected, however, the mode
is fixed the RECIRC.
¥ When the Mode Switch is depressed
If the automatic intake control is selected, the
intake is fixed to the currently selected mode.5. Compressor Control
In the automatic control mode, the automatic
heater/air conditioner control unit turns on or off
the compressor with the evaporator anti-freeze
mechanism using the duct sensor. And, when
outside air is detected to be low through the
ambient sensor signal, the control unit turns off
the compressor using the compressor control
function.
¥ Manual Control
In the automatic control mode, pressing the A/C
(air conditioning) switch turns off the
compressor.
¥ Pressing the DEF mode switch automatically
turns on the compressor.
Intake door open / close
RECIRC Setup temperature
signal
Intake
actuator
Position
detection
switch
In car sensor
Ambient sensor
Sun sensor
Compressor
ON / OFF
Fan ON / OFF
Intake switch
Control unit
Intake door
MIX
FRESH
Heater
sideCooler
side Total mode signal
C01RY00012
Ambient sensor
Control unit
Pressure switch
Thermo switch relay
ECM
Compressor relay
Compressor
Electronic
thermostat
Air conditioning
switch
Set up temperature
signal
C01RY00010

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