1998 ISUZU TROOPER bulb

8DÐ140 WIRING SYSTEM
1Ð5. Both Headlights In High-Beam Inoperative
·DISCONNECT THE DIMMER•
PASSING SW CONNECTOR (COMBINATION SW)
YES
REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN
15 B-12 AND 16 H-16REPAIR OR REPLACE THE DIMMER•
PASSING SW
NO
·WITH THE SWITCH AT HIGH-BEAM, IS THERE
CONTINUITY BETWEEN THE SWITCH CONNECTOR TERMINALS
15 B-12 AND 16 B-12 ?
1Ð6. Headlight High-Beam On The Left (Or Right) Side Inoperative
·IS THE HEADLIGHT BULB ON THE
LEFT (OR RIGHT) SIDE NORMAL?
YES
·IS THE FUSE F–4 (15A) (OR F–5 (15A))
NORMAL?
YES
REPLACE THE BULB
NO
·DISCONNECT THE DIMMER·PASSING SW CONNECTOR
·WITH THE SWITCH AT THE HIGH–BEAM POSITION, IS THERE
CONTINUITY BETWEEN 15 B–12 AND 16 B–12 ?
YES
REPLACE THE FUSE
NO
REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN 3 C–21 AND F–4
(15A) (OR 3 C–32 AND F–5 (15A))
NO
REPAIR OR REPLACE THE DIMMER·PASSING SWREPAIR A POOR CONNECTION AT THE CONNECTORS OR AN
OPEN CIRCUIT BETWEEN 15 B–12 AND 2 C–21 (OR 15 B–12
AND 2 C–32 )
·IS THE CONTINUITY BETWEEN
3 C–21 AND F–4 (15A) (OR 3 C–32
AND F–5 (15A)) NORMAL?
NOYES

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)

8DÐ146 WIRING SYSTEM
2-6. Headlight High-Beam On The Left (Or Right) Side Inoperative
2-7. Headlight Beam Does Not Change
·IS THE CONTINUITY IN THE DIMMER·PASSING
SW NORMAL ?
YES
REPAIR OR REPLACE THE SWITCH
NO
·IS B-19 GROUNDED SECURELY?
YESNO
GROUND IT SECURELY
REPAIR A POOR CONNECTION AT THE CONNECTORS OR
AN OPEN CIRCUIT BETWEEN 5 X-3 AND 15 B-12
·IS THE DIMMER RELAY NORMAL?
YESNO
REPAIR AN OPEN CIRCUIT BETWEEN 16 B-12 AND
B-19
REPLACE THE RELAY·IS THERE CONTINUITY BETWEEN 16 B-12 AND
B-19 ?
YESNO
·IS THE HEADLIGHT BULB NORMAL?
YESNO
REPLACE THE BULB·IS THE FUSE F-4 (10A) (OR F-5 (10A)) NORMAL?
YES
REPAIR A POOR CONNECTION AT THE CONNECTORS OR
AN OPEN CIRCUIT BETWEEN
(LH) FUSE F-4 (10A) AND 2 C-21
(RH) FUSE F-5 (10A) AND 2 C-32
NO
REPLACE THE FUSE

WIRING SYSTEM 8DÐ149
3-2. FRT Fog Light On The Left (Or Right) Side Inoperative
(While The Clearance Light Is ON)
·IS THE BULB NORMAL ?
YES
REPLACE THE BULB
NO
·IS THERE CONTINUITY BETWEEN 13 H-42 (4 H-41 )
AND 1 C-24 (OR 1 C-29 )?
YES
REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN 13 H-42 (4 H-41 )
AND 1 C-24 (OR 1 C-29 )
NO
REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN 2 C-24 (2 C-29 )
AND 5 C-16 (OR 6 C-16 )

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

8DÐ170 WIRING SYSTEM
1-3 Taillight On The Left (Or Right) Side Inoperative
IS THE TAILLIGHT BULB ON THE LEFT (OR RIGHT)
SIDE NORMAL?·
·YES
NO
REPLACE THE BULB
WITH THE LIGHTING SWITCH AT THE CLEARANCE
LIGHT POSITION, IS THE BATTERY VOLTAGE APPLIED
BETWEEN 6 R-13 (OR 6 R-12 ) AND THE GROUND,
OR 4 F-7 (OR 4 F-8 ) AND THE GROUND?
YESNO
REPAIR A POOR CONNECTION AT
THE CONNECTORS OR AN OPEN
CIRCUIT BETWEEN 10 H-32 AND
6 R-13 (OR 9 H-32 AND 6 R-12 ),
OR 10 H-32 AND 4 F-7 (OR 9 H-32
AND 4 F-8 ) REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN 1 R-13 (OR 1 R-12 )
AND R-4 , OR 2 F-7 (OR 2 F-8 ) AND R-4

8DÐ172 WIRING SYSTEM
1-5 Clearance Light On The Left (Or Right) Side Inoperative
·IS THE CLEARANCE LIGHT BULB ON THE LEFT
(OR RIGHT) SIDE NORMAL?
YESNO
REPLACE THE BULB·IS THERE ANY CONTINUITY BETWEEN THE HARNESS SIDE
CONNECTOR 1 H-41 AND 2 C-22 (OR 2 C-31 )?
YESNO
REPAIR A POOR CONNECTION AT THE CONNECTORS OR AN
OPEN CIRCUIT BETWEEN 1 C-22 (OR 1 C-31 ) AND
1 C-16 REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT IN
THE CIRCUIT
1-6 License Plate Light Inoperative
(RHD-1)
·DO THE BOTH TAILLIGHTS LIGHT UP WHEN THE LIGHTING
SWITCH IS AT THE CLEARANCE LIGHT POSITION?
YESNO
GROUND R-4 SECURELY·IS THE LICENSE PLATE LIGHT BULB NORMAL?
YESNO
REPAIR A POOR CONNECTION AT THE CONNECTORS OR AN
OPEN CIRCUIT BETWEEN 2 G-8 AND R-4REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT IN
THE CIRCUIT
YESNO
REPLACE THE BULB·IS THERE ANY CONTINUITY BETWEEN THE HARNESS
SIDE CONNECTOR 1 G-8 AND 1 H-39 ?