1998 ISUZU TROOPER cruise control

8A–2LIGHTING SYSTEM
Vanity Mirror Illumination Bulb 8A–16 . . . . . . . . . . . . .
Removal 8A–16 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8A–16 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starter Switch 8A–17 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal 8A–17 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8A–17 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lighting Switch (Combination Switch) 8A–18 . . . . . .
Removal 8A–18 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8A–18 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fog Light Switch 8A–19 . . . . . . . . . . . . . . . . . . . . . . . .
Removal 8A–19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8A–19 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stoplight Switch (W/O Cruise Control) 8A–20 . . . . . .
Removal 8A–20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8A–20 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Brake Switch (W/Cruise Control) 8A–21 . . . . . . . . . .
Removal 8A–21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8A–21 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Turn Signal Switch (Combination Switch) 8A–21 . . .
Removal and Installation 8A–21 . . . . . . . . . . . . . . .
Hazard Warning Switch 8A–22 . . . . . . . . . . . . . . . . . .
Removal 8A–22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Installation 8A–22 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tailgate Switch 8A–23 . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal 8A–23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8A–23 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Door Switch 8A–23 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal 8A–23 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8A–23 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Defogger Switch 8A–24 . . . . . . . . . . . . . . . . . . .
Removal 8A–24 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8A–24 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Seat Heater Switch 8A–25 . . . . . . . . . . . . . . . . . . . . . .
Removal 8A–25 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8A–25 . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Key Remind Switch (Starter Switch) 8A–25 . . . . . . .
Removal and Installation 8A–25 . . . . . . . . . . . . . . .
Illumination Controller 8A–26 . . . . . . . . . . . . . . . . . . . .
Removal 8A–26 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8A–26 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power/Winter Switch 8A–27 . . . . . . . . . . . . . . . . . . . . .
Removal 8A–27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8A–27 . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main Data and Specifications 8A–28 . . . . . . . . . . . . .
Service Precaution
WARNING: I F S O E Q U IPPED WITH A
SUPPLEMENTAL RESTRAINT SYSTEM (SRS),
REFER TO THE SRS COMPONENT AND WIRING
LOCATION VIEW IN ORDER TO DETERMINE
WHETHER YOU ARE PERFORMING SERVICE ON OR
NEAR THE SRS COMPONENTS OR THE SRS
WIRING. WHEN YOU ARE PERFORMING SERVICE
ON OR NEAR THE SRS COMPONENTS OR THE SRS
WIRING, REFER TO THE SRS SERVICE
INFORMATION. FAILURE TO FOLLOW WARNINGS
COULD RESULT IN POSSIBLE AIR BAG
DEPLOYMENT, PERSONAL INJURY, OR
OTHERWISE UNNEEDED SRS SYSTEM REPAIRS.
CAUTION: Always use the correct fastener in the
proper location. When you replace a fastener, use
ONLY the exact part number for that application.
ISUZU will call out those fasteners that require a
replacement after removal. ISUZU will also call out
the fasteners that require thread lockers or thread
sealant. UNLESS OTHERWISE SPECIFIED, do not
use supplemental coatings (Paints, greases, or other
corrosion inhibitors) on threaded fasteners or
fastener joint interfaces. Generally, such coatings
adversely affect the fastener torque and the joint
clamping force, and may damage the fastener. When
you install fasteners, use the correct tightening
sequence and specifications. Following these
instructions can help you avoid damage to parts and
systems.

8A–20LIGHTING SYSTEM
Stoplight Switch (W/O Cruise Control)
Removal
1. Disconnect the battery ground cable.
2. Disconnect the connector(3), loosen the lock nut(1)
and then remove the stoplight switch(2) by turning it.
310RS007
Installation
To install, follow the removal steps in the reverse order,
noting the following points.
1. Check to see if the brake pedal has been returned by
the return spring to the specified position.
2. Turn the stoplight switch(1) clockwise until the tip of
the threaded portion of the switch contacts the pedal
arm(2).
3. Turn the switch counterclockwise until the space
between the tip of the threaded portion and the pedal
arm is 0.5 to 1.0 mm (0.02–0.04 in.).
310RS006

LIGHTING SYSTEM8A–21
Brake Switch (W/Cruise Control)
Removal
1. Disconnect the battery ground cable.
2. Disconnect the connector(1), loosen the lock nut(3)
and then remove the brake switch(2) by turning it.
310RW010
Installation
To install, follow the removal steps in the reverse order,
noting the following points.
1. Check to see if the brake pedal has been returned by
the return spring to the specified position.
2. Turn the switch clockwise until the tip of the threaded
portion of the brake switch contacts the pedal arm.
3. Turn the switch counterclockwise until the space
between the tip of the threaded portion and the pedal
arm is 0.5 to 1.0 mm (0.02–0.04 in.).
310RS003
Turn Signal Switch (Combination Switch)
Removal and Installation
Refer to the removal and installation steps of the Lighting
Switch (Combination Switch) in this section.

8A–30LIGHTING SYSTEM
Power drive1.4w1Meter
Winter drive1.4w1Meter
Air bag2w1Meter
Engine warming SW0.84w1
FRT fog light SW0.84w1
RR fog light SW0.84w1
Glove box1.2w1
Ashtray1.4w1
Illumination controller0.7w1
Heater bezel150mA2
Hazard warning light SW0.84w1
Meter3.4w4Meter ASM
IlluminationCigar lighter1.4w1Light
Rear wiper & washer SW0.84w1
Rear defogger SW0.84w1
Mirror control SW45mA1
Mirror defogger SW0.7w1
Mirror folding SW0.7w1
A/T select lever1.2w1
Power & Winter SW50mA2
Cruise control main SW0.84w1
Headlight wiper SW0.84w1
Torque Specifications
ApplicationN·mkg·mLb FtLb In
Steering Shaft Nut343.525—

WIRING SYSTEM 8DÐ1
BODY AND ACCESSORIES
WIRING SYSTEM
CONTENTS
Service Precautions . . . . . . . . . . . . . . . . . . . 8DÐ3
General Description . . . . . . . . . . . . . . . . . . . 8DÐ4Notes for Working on Electrical Items . . 8DÐ4
Symbols and Abbreviations . . . . . . . . . . . 8DÐ10
Parts for Electrical Circuit . . . . . . . . . . . . . 8DÐ12
Reading the Circuit Diagram . . . . . . . . . . 8DÐ21
Main Data and Specifications . . . . . . . . . . . 8DÐ24 Fuse, Fusible Link and Circuit Breaker Location . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ24
Relay Location . . . . . . . . . . . . . . . . . . . . . . 8DÐ27
Diode Location . . . . . . . . . . . . . . . . . . . . . . 8DÐ30
Grounding Point . . . . . . . . . . . . . . . . . . . . . 8DÐ33
Cable Harness Routing . . . . . . . . . . . . . . . 8DÐ45
Fuse Block Circuit . . . . . . . . . . . . . . . . . . . . . 8DÐ53 Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ54
Start and Charging . . . . . . . . . . . . . . . . . . . . 8DÐ67 General Description . . . . . . . . . . . . . . . . . . 8DÐ67
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ68
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ70
Powertrain Control Module (PCM) . . . . . . . 8DÐ80 General Description . . . . . . . . . . . . . . . . . . 8DÐ80
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ81
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ93
QOSIII (4JG2) . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ111 General Description . . . . . . . . . . . . . . . . . . 8DÐ111
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ112
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ114
QOS and EGR System (4JG2) . . . . . . . . . . . 8DÐ118 General Description . . . . . . . . . . . . . . . . . . 8DÐ118
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ119
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ122
Headlight and Fog Light . . . . . . . . . . . . . . . . 8DÐ127 General Description . . . . . . . . . . . . . . . . . . 8DÐ127
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ128
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ130
Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ134
Rear Foglight . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ150 Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ151
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ152
Headlight Leveling . . . . . . . . . . . . . . . . . . . . 8DÐ153 General Description . . . . . . . . . . . . . . . . . . 8DÐ153
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ154
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ155
Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ156
Clearance Light, Taillight and License Plate Light . . . . . . . . . . . . . . . . . . . . 8DÐ159 General Description . . . . . . . . . . . . . . . . . . 8DÐ159
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ160
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ163
Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ168
Interior Illumination Light . . . . . . . . . . . . . . 8DÐ180 General Description . . . . . . . . . . . . . . . . . . 8DÐ180
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ181
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ185
Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ192
Turn Signal Light and Hazard Warning Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ193
General Description . . . . . . . . . . . . . . . . . . 8DÐ193
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ194
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ197
Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ202
Stoplight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ208 General Description . . . . . . . . . . . . . . . . . . 8DÐ208
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ209
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ212
Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ216
Backup Light. . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ220 General Description . . . . . . . . . . . . . . . . . . 8DÐ220
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ221
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ223
Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ227
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ230 General Description . . . . . . . . . . . . . . . . . . 8DÐ230
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ231
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ232
Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ235
Dome Light, Luggage Room Light, Courtesy Light and Map Light . . . . . . . . . . 8DÐ237
General Description . . . . . . . . . . . . . . . . . . 8DÐ237
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ238
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ240
Power Door Lock . . . . . . . . . . . . . . . . . . . . . . 8DÐ244 General Description . . . . . . . . . . . . . . . . . . 8DÐ244
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ245
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ250
Diagnosi s. . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ2 56
Power Window . . . . . . . . . . . . . . . . . . . . . . . 8DÐ261 General Description . . . . . . . . . . . . . . . . . . 8DÐ261
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ262
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ263
Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ266
Cruise Control . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ272

WIRING SYSTEM 8DÐ33
Grounding Point
Reference Table
(6VD1 RHD)
Connector No. Cable harness Location Parts (Load)
B-1
Door mirror defogger (LH), Fan SW, FRT power
window & door lock SW-LH, Cruise control
unit, FRT door key SW-LH, FRT door lock
actuator-LH, FRT door lock SW-LH
B-2Sun roof SW, Sun roof control unit,
Safety SW, Limit SW
Body-LH
B-18
FRT door key SW-RH, FRT door lock & power
window SW-RH, FRT door lock actuator & lock
SW-RH, FRT door lock SW-RH, Door mirror
defogger (RH), RR wiper intermittent relay,
Mode SW (A/T), Starter relay
B-19
B-26RR Power window SW-RH, Mirror control SW,
Mirror defogger SW, Mirror folding SW,
Car telephone, Shift lock controller, POWER &
WINTER SW, Seat heater, Seat heater SW,
RR door lock actuator-LH, EBCM Body-RH
Body harness
Body-center
C-16
Pump & VSV, Headlight wiper timer2
C-16
4WD SW, VSV;FRT axle, FRT axle SW3
C-16
FRT fog light 4
C-16P/S pressure SW, Headlight leveling actuator-LH7
C-16
Side turn signal light (LH)
8Fender-LH Engine room
harness
Cigar lighter, Dimmer·passing SW, Illumination
controller, RR defogger SW, Flasher unit,
Power window relay, Cruise main indicator
light, Lighting SW, Glove box illumination light,
Ashtray illumination light, Headlight wiper SW,
Clock, FRT fog light SW, Variable intermittent
(FRT wiper & washer SW), Kick down SW,
Anti-theft controller, Turn signal indicator light,
Heater & A/C relay
C-16
5
Headlight wiper motor
C-16Clearance light, FRT turn signal light1
C-16O2 Sensor, Headlight leveling actuator-RH
6B-28
RR power window SW-RH, Power & winter SW,
Power seat SW, Tilt motor & SW, Recliner
motor & SW, RR door lock actuator-RH, EBCM

WIRING SYSTEM 8DÐ35
(6VD1 LHD)
Connector No. Cable harness Location Parts (Load)
B-1
FRT power window & door lock SW-RH, FRT
door key SW-RH, FRT door lock actuator-RH,
Door lock SW-RH, Door mirror defogger (RH),
Key & light remind buzzer (Saudi Arabia),
Sun roof SW, Sun roof control unit, Safety SW,
Limit SW
B-2Seat belt warning light (Saudi Arabia), Cruise
control unit, Fan SW, Turn signal indicator
light, Clock, Glove box illumination light,
Ashtray illumination light, RR defogger SW,
Cigar lighter
Body-RH
B-18
FRT door key SW-LH, FRT door lock actuator &
lock SW-LH, Door lock SW-LH, FRT door lock &
power window SW-LH, Door mirror defogger
(LH), RR wiper intermittent relay, Starter relay,
Mode SW (A/T), Power window relay
B-19
B-26Mirror control SW, Mirror folding SW, Mirror
defogger SW, RR Door lock actuator-RH, Car
telephone, Shift lock controller, POWER &
WINTER SW, Seat heater, Seat heater SW,
EBCM, RR power window SW-RH Body-LH Body harness
Body-center
C-164WD SW, VSV;FRT axle, FRT axle SW3
C-16
FRT fog light 4
C-16
O2 Sensor7
C-16
Side turn signal light (LH)
8Fender-LH Engine room
harnessDimmer·passing SW, Illumination controller,
RR defogger SW, Flasher unit, Cruise main
indicator light, Lighting SW, Headlight wiper
SW, Clock, FRT fog light SW, Variable
intermittent (FRT wiper & washer SW),
Anti-theft controller, Heater & A/C relay, Kick
down SW
C-16
5
Headlight wiper motor
C-16Clearance light, FRT turn signal light1
B-28EBCM, Seat belt SW (Saudi Arabia), Tilt motor
& SW, Recliner motor & SW, Power seat SW
P/S pressure SW
C-166

WIRING SYSTEM 8DÐ89
Circuit Diagram (RHD 6V
*1)Ð9
3.0
B/Y
C-3 10A
TURN, BACKC-1 10A
STARTER RELAYSTARTER SW
(IG1)
EHCU : ELECTRONIC HYDRAULIC CONTROL UNIT
PCM : POWERTRAIN CONTROL MODULE
P C M
H-11H-7
6M-25
3 0.85
R/B
0.75
R/B
0.75
R/L
BACKUP
LIGHT 0.5
R/B
17M-258H-117
3.0
W/GSTARTER SW
(ST)
H-10H-12
0.5
W/L
1.25
W/L
STARTER
RELAY (6)0.5
W/RM-25
M-25
5C-3
E12 0.5
L/W
0.5
L/WH-531
M-25
6C-3
E7 0.5
L/Y
0.5
L/YH-532
M-25
7C-3
F2 0.5
L/B
0.5
L/BH-533
M-25
2C-3
F3 0.5
Y/G
0.5
Y/GH-534
8
H-87
MODE SW
1 152
C-1EHCU (6)
0.5
GR
A12
C-3
CRUISE CONTROL
UNIT (5)
0.5
GR/L
F10
M-25
1.25
W/RH-104
16H-42
D08RW595