1998 ISUZU TROOPER lights

WIRING SYSTEM 8DÐ143
2-1. Both Headlights Inoperative
·IS THE LIGHTING RELAY NORMAL?
YES
REPLACE THE RELAY
NO
·IS B-19 GROUNDED SECURELY?
YESNO
GROUND IT SECURELY·IS THE DIODE NORMAL ?
YESNO
REPLACE THE DIODE
·IS THE DIMMER RELAY NORMAL?
YESNO
REPLACE THE RELAY·
·DISCONNECT THE LIGHTING SW CONNECTOR
YESNO
·
·REMOVE THE LIGHTING SW
YESNO
REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN THE FUSIBLE LINK
FL-1 (80A) AND 1 B-12
REPAIR OR REPLACE THE LIGHTING SW REPAIR A POOR CONNECTION AT THE CONNECTORS OR
AN OPEN CIRCUIT BETWEEN THE LIGHTING SW HARNESS SIDE
CONNECTOR 7 B-12 AND B-19
IS THE BATTERY VOLTAGE APPLIED BETWEEN THE
HARNESS SIDE CONNECTOR 1 B-12 AND GROUND?
IS THERE CONTINUITY BETWEEN 1 B-12 AND 7 B-12 WHEN
SETTING THE LIGHTING SW AT THE HEADLIGHT POSITION?

8DÐ144 WIRING SYSTEM
2-2. Headlight On The Left (Or Right) Side Inoperative
·IS THE HEADLIGHT BULB ON THE LEFT (OR RIGHT) SIDE
NORMAL?
YES
REPLACE THE BULB
NO
·IS 7 C-39 (OR 5 C-39 ) GROUNDED SECURELY? (RH)
IS 4 C-39 (OR 7 C-16 ) GROUNDED SECURELY? (LH)
YESNO
GROUND IT SECURELY
REPAIR AN OPEN CIRCUIT BETWEEN
3 C-32 AND 7 C-39 (OR 5 C-39 ) (RH)
3 C-21 AND 4 C-39 (OR 7 C-16 ) (LH)
·IS THE DIMMER RELAY NORMAL?
YES
REPAIR A POOR CONNECTION AT THE CONNECTORS OR
AN OPEN CIRCUIT BETWEEN 2 X-3 AND FUSE F-6 (10A)
NO
REPLACE THE RELAY
2-3. Both Headlights In Low-Beam Inoperative

WIRING SYSTEM 8DÐ145
2-4. Headlight Low-Beam On The Left (Or Right) Side Inoperative
2-5. Both Headlights In High-Beam Inoperative
·IS THE HEADLIGHT BULB NORMAL?
YESNO
REPLACE THE BULB·IS THE FUSE F-6 (10A) (OR F-7 (10A)) NORMAL?
YES
REPAIR A POOR CONNECTION AT THE CONNECTORS OR
AN OPEN CIRCUIT BETWEEN FUSE F-6 (10A) AND 1 C-21
(OR FUSE F-7 (10A) AND 1 C-32 )
NO
REPLACE THE FUSE
·IS THE DIMMER RELAY NORMAL?
YESNO
REPLACE THE RELAY·
·DISCONNECT THE DIMMER·PASING SW CONNECTOR
IS THERE ANY CONTINUITY BETWEEN THE SWITCH SIDE
CONNECTOR 15 B-12 AND 16 B-12 WHEN THE
SWITCH IS AT HIGH-BEAM POSITION?
YESNO
REPAIR OR REPLACE THE SWITCH·IS THE BATTERY VOLTAGE APPLIED BETWEEN THE
HARNESS SIDE CONNECTOR 15 B-12 AND GROUND
WHEN THE SWITCH IS AT HIGH-BEAM POSITION?
YESNO
REPAIR A POOR CONNECTION AT THE CONNEC-
TORS OR AN OPEN CIRCUIT BETWEEN 5 X-3
AND 15 B-12REPAIR A POOR CONNECTION AT THE CONNECTOR OR AN
OPEN CIRCUIT BETWEEN 3 X-3 AND FUSE F-4 (10A)

WIRING SYSTEM 8DÐ147
2-8. Headlights Remain On When The Lighting SW Is Turned Off
2-9. Headlights Come On When The Lighting SW At The Clearance Light Position
·IS THE LIGHTING RELAY NORMAL?
YES
REPLACE THE RELAY
NO
·
·DISCONNECT THE LIGHTING SW CONNECTOR
YESNO
REPAIR OR REPLACE THE LIGHTING SW
REPAIR A SHORT CIRCUIT BETWEEN 5 X-1
AND 1 B-12
IS THE CONTINUITY BETWEEN THE SWITCH CONNECTOR
TERMINALS 1 B-12 AND 7 B-12 NORMAL?
REPAIR OR REPLACE THE LIGHTING SW
2-10. Passing Lights Inoperative
·
·DISCONNECT THE DIMMER·PASSING SW CONNECTOR
YESNO
REPAIR OR REPLACE THE SWITCH
REPAIR A POOR CONNECTION AT THE CONNECTORS OR
AN OPEN CIRCUIT BETWEEN 4 H-12 AND 14 B-12
WITH THE AT PASSING POSITION, IS THERE CONTINUITY
BETWEEN THE SWITCH CONNECTOR TERMINALS 14 B-12
AND 16 B-12 , AND 15 B-12 AND 16 B-12 ?

8DÐ148 WIRING SYSTEM
3-1. Both FRT Fog Lights Inoperative (While The Clearance Light Is On)
·IS 5 C-16 (OR 6 C-16 ) GROUNDED SECURELY?
YES
GROUND IT SECURELY
NO
·
·REMOVE THE FRT FOG LIGHT SWITCH
IS THE CONTINUITY IN THE SWITCH NORMAL?
YES
REPAIR OR REPLACE THE SWITCH
NO
WITH THE LIGHTING SWITCH AT CLEARANCE LIGHT POSITION,
IS THE BATTERY VOLTAGE APPLIED BETWEEN 4 I-5 AND
THE GROUND?
YES
REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN 4 X-9 (OR FUSE F-12)
AND 4 I-5
NO
REMOVE THE FRT FOG LIGHT RELAY
IS THE RELAY NORMAL?·
·
YES
REPAIR OR REPLACE THE RELAY
NO
REINSTALL THE FRT FOG LIGHT SWITCH
WITH THE LIGHTING SWITCH AT CLEARANCE LIGHT
POSITION AND FRT FOG LIGHT SWITCH AT ON POSITION, IS
THE BATTERY VOLTAGE APPLIED BETWEEN I X-23 AND THE
GROUND?·
·
YES
REPAIR A POOR CONNECTION AT THE CONNCETORS
OR AN OPEN CIRCUIT BETWEEN 5 I-5 AND 1 X-23
NO
IS THERE CONTINUITY BETWEEN 3 X-23 AND THE GROUND?· ·
YESNO
REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN 3 X-23 AND 4 C-39
REPAIR A POOR CONNECTION AT THE CONNECTORS OR AN
OPEN CIRCUIT BETWEEN 4 X-23 AND 13 H-42 (OR 4 H-41 )
·IS THE FUSE F-8 (20A OR 15A) NORMAL?
YES
REPLACE THE FUSE
NO

WIRING SYSTEM 8DÐ159
Clearance Light, Taillight and
License Plate Light
General Description
The circuit consists of the lighting switch, clearance
light, taillight and license plate light.
All these lights come on when the lighting switch
are turned on with the switch to either clearance or
headlight position.

8DÐ168 WIRING SYSTEM
Diagnosis
Quick Chart for Check Point
1. RHD
2. LHD
Trouble
modeCheck point
RHD-1
RHD-2
RHD-2
Fuse
F-12
(15A)Lighting
SWTail
relayClearance
light bulbLicense
plate light
bulbCable harness
1-3 Taillight on the left (or
right) side inoperative
1-4 Both clearance
lights inoperative
1-5
Clearance light on the left
(or right) side inoperative
1-6 License
plate light
inoperative
1-7 License plate
light on the
left (or right)
side inoperative
1-1 All illumination lights
inoperative
1-2 Both Taillights inopera-
tive
Taillight
bulb
Trouble ModeCheck pointFuse
F-12
(10A)Lighting
SWTaillight
bulbClearance
light bulbLicense
plate light
bulbCable
harness
2-1All illumination lights
inoperative
2-2Both taillights
inoperative
2-3Taillight on the left (or
right) side inoperative
2-4Both clearance lights
inoperative
2-5Clearance light on the left
(or right) side inoperative
2-6LHD-1
LHD-2
LHD-2License plate
light
inoperative
2-7 License plate
light on the left
(or right) side
inoperative
Fuse
F-11
(10A) Tail
relay
2-8
Both taillight and
clearance light on the left
(or right) side inoperative

WIRING SYSTEM 8DÐ169
1-1 All Illuminations Lights Inoperative
1-2 Both Taillights Inoperative
IS THE BATTERY VOLTAGE APPLIED BETWEEN
HARNESS SIDE CONNECTOR 8 B-12 AND GROUND
WHEN LIGHTING SWITCH IS "ON" ?
REPAIRA POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN 7 B-12 AND B-19
OR BETWEEN 4 X-9 AND 1 H-41 )IS FUSE F-12 (15A) NORMAL?
REPLACE THE FUSE
NO
REPAIR OR REPLACE THE SWITCH
NO
IS THE CONTINUITY IN THE LIGHTING SWITCH NORMAL?
YES
YES
REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT
BETWEEN 8 B-12 AND FUSE F-12 (15A)
NOYES
· ··
NO
IS TAIL RELAY (X-9) NORMAL?
YES
·
REPAIR OR REPLACE THE RELAY
·DOES THE LICENSE PLATE LIGHT LIGHT UP WHEN THE
LIGHTING SWITCH IS AT THE CLEARANCE LIGHT
POSITION?
YESNO
GROUND R-4 SECURELYREPAIR A POOR CONNECTION AT THE CONNECTORS OR AN
OPEN CIRCUIT BETWEEN 4 H-15 AND 10 H-32