ISUZU TROOPER 1998 Service Repair Manual

8DÐ228 WIRING SYSTEM
1 Both Backup Lights Inoperative
·IS FUSE C-3 (10A) NORMAL?
·IS R-4 GROUNDED SECURELY?
GROUND IT SECURELY
YES
REPLACE THE FUSE
NO
YESNO
·
·
YESNO
·
·SET THE TRANSMISSION GEAR TO THE REVERSE POSITION
WITH THE MODE SW (OR BACKUP LIGHT SW) CONNECTOR
DISCONNECTED, IS THERE CONTINUITY BETWEEN THE SW
SIDE CONNECTORS 5 C-43 AND 2 C-43 (1 E-42 AND
1 E-43 OR 1 M-8 AND 1 M-9 ) ?REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN THE FUSE C–3 (10A)
AND MODE SW (BACKUP LIGHT SW)
NO
REPAIR OR REPLACE THE MODE SW
(BACKUP LIGHT SW)
REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN 2 C-43 ( 1 E-43 OR
1 M-9 ) AND 8 H-32
TURN THE STARTER SW ON
IS THE BATTERY VOLTAGE APPLIED BETWEEN THE MODE
SW (OR BACKUP LIGHT SW) HARNESS SIDE CONNECTORS
8 M-25 (1 E-42 , 1 M-8 OR 1 E-15 ) AND THE GROUND?

WIRING SYSTEM 8DÐ229
2 Backup Light On The Left (Or Right) Side Inoperative
3 Backup Light Remains ON
REPAIR OR REPLACE THE MODE SW (BACKUP LIGHT SW)
·IS THE BACKUP LIGHT BULB ON THE LEFT (OR RIGHT) SIDE
NORMAL?
YES
·WITH THE STARTER SW AND THE BACKUP LIGHT SW AT ON
POSITION, IS THE BATTERY VOLTAGE APPLIED BETWEEN
3 R-13 (OR 3 R-12 ) AND THE GROUND OR 2 R-13
(OR 2 R-12 ) AND THE GROUND?REPLACE THE BULB
NO
REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN 8 H-32
AND 3 R-13 (OR 3 R-12 ) OR 8 H-32 AND 2 R-13
(OR 2 R-12 )
NOYES
REPAIR A POOR CONNECTION AT THE CONNECTORS OR AN
OPEN CIRCUIT BETWEEN BACKUP LIGHT HARNESS SIDE
CONNECTOR 1 R-13 (OR 1 R-12 ) AND R-4

8DÐ230 WIRING SYSTEM
Horn
General Description
The circuit consists of horn (high note), horn (low
note), horn relay and horn switch.
When horn switch is pushed, (independent of
position of starter switch) horn relay is activated to
sound horns.

WIRING SYSTEM 8DÐ231
Circuit Diagram (RHD)
3
H-1612X-8
X-8 X-82
C-281 1
HORN RELAY
2.0
G/O0.85
G/O
0.3
B/O
0.3
B/O0.85
G/Y
0.85
G/Y 2.0
G/O5.0
WBATT.(+)
F-3 15A
HORN, HAZARD FL-1 80A
MAIN
HAZARD
WARNING SW
(2)
12
B-12
HORN SWHORN
(LOW NOTE)
HORN
(HIGH NOTE)
H-1516
C-271
D08RW660

8DÐ232 WIRING SYSTEM
Parts Location (RHD)
Legend
(1) Horn Switch
(2) Horn (Low Note)
(3) C-28
(4) C-27(5) Horn (High Note)
(6) Relay and Fuse Box (X-8)
(7) Fuse Box
(8) H-15, H-16
(9) B-12
54
6
7
8
9
1
3
2
D08RW880

WIRING SYSTEM 8DÐ233
Circuit Diagram (LHD)
3
H-1614X-8
X-8 X-82
C-281 1
HORN RELAY
2.0
G/O0.85
G/O
0.3
B/O
0.3
B/O0.85
G/Y
0.85
G/Y 2.0
G/O5.0
WBATT.(+)
F-3 15A
HORN, HAZARD FL-1 80A
MAIN
HAZARD
WARNING SW
(2)
12
B-12
HORN SWHORN
(LOW NOTE)
HORN
(HIGH NOTE)
H-1216
C-271
D08RW954

8DÐ234 WIRING SYSTEM
Parts Location (LHD)
Legend
(1) Horn Switch
(2) Fuse Box
(3) B-12
(4) C-28(5) C-27
(6) Horn (High Note)
(7) Horn (Low Note)
(8) Relay and Fuse Box (X-8)
(9) H-12, H-16
1
9
8
7
6
54
32
D08RW398

WIRING SYSTEM 8DÐ235
1 Horns Do Not Sound
·IS FUSE F-3 (15A) NORMAL?
YES
·IS THE HORN RELAY NORMAL? REPLACE THE FUSE
NO
YES
·IS THE BATTERY VOLTAGE APPLIED BETWEEN
2 X-8 AND THE GROUND?REPLACE THE HORN RELAY
NO
YES
·IS THE HORN SWITCH NORMAL?
NO
YESNO
NOYES
REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT
BETWEEN FUSE F-3 (15A) AND 2 X-8
·
·WITH THE HORN SWITCH DEPRESSED,
IS THERE CONTINUITY BETWEEN 1 X-8 AND
THE GROUND?REPAIR OR REPLACE THE SWITCH
REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT BETWEEN
1 X-8 AND 12 B-12REPAIR A POOR CONNECTION AT THE CONNECTORS OR AN
OPEN CIRCUIT BETWEEN 3 X-8 AND 1 C-27 (1 C-28 )
WARNING:
WHEN SERVICING A VEHICLE EQUIPPED WITH SUPPLEMENTAL RESTRAINT SYSTEM, PAY
CLOSE ATTENTION TO ALL WARNINGS AND CAUTIONS.
FOR DETAILED EXPLANATION ABOUT SRS, REFER TO SECTION 9J ÒSUPPLEMENTAL
RESTRAINT SYSTEM (SRS)Ó AND 3F4 ÒSUPPLEMENTAL RESTRAINT SYSTEM STEERING WHEEL
& COLUMNÓ.

8DÐ236 WIRING SYSTEM
2 Horns Do Not Shut Off
·IS THE HORN RELAY NORMAL?
YES
·
·REMOVE THE HORN SW
IS THE MOVABLE PORTION OF THE HORN SW ALWAYS OUT
OF CONTACT WITH THE GROUND BRACKET?REPLACE THE HORN RELAY
NO
YES
REPAIR A SHORT CIRCUIT BETWEEN HORN RELAY HARNESS
SIDE CONNECTOR 1 X-8 AND 12 B-12REPAIR OR REPLACE THE HORN SW
NO
WARNING:
WHEN SERVICING A VEHICLE EQUIPPED WITH SUPPLEMENTAL RESTRAINT SYSTEM, PAY
CLOSE ATTENTION TO ALL WARNINGS AND CAUTIONS.
FOR DETAILED EXPLANATION ABOUT SRS, REFER TO SECTION 9J ÒSUPPLEMENTAL
RESTRAINT SYSTEM (SRS)Ó AND 3F4 ÒSUPPLEMENTAL RESTRAINT SYSTEM STEERING WHEEL
& COLUMNÓ.

WIRING SYSTEM 8DÐ237
Dome Light, Luggage Room Light,
Courtesy Light and Map Light
General Description
This circuit consists of the starter switch, door
switch, dome light, luggage room light, courtesy
light, map light, and alarm & relay control unit.
The dome light lights up when any one of doors
except the tailgate is opened with the switch set at
the door mode.
The courtesy lights for the front doors are controlled
by front door switchÐLH.
The luggage room light illuminates by opening the
tailgate when the switch is set at the door mode.
The map light illuminates by turning the switch on.
All these lights light up by turning on respective
switches regardless of the position of the starter
switch key.
The buzzer in the alarm & relay control unit sounds
to remind the driver to turn off the lights when the
starter switch is turned off.