Isuzu Trooper (1998-2002 year). Manual — part 909
8D–170
WIRING SYSTEM
Diagnosis
Quick Chart for Check Point
1. RHD
2. LHD
Trouble
mode
Check point
RHD-1
RHD-2
RHD-2
Fuse
F-12
(15A)
Lighting
SW
Tail
relay
Clearance
light bulb
License
plate light
bulb
Cable 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 Mode
Check point
Fuse
F-12
(10A)
Lighting
SW
Taillight
bulb
Clearance
light bulb
License
plate light
bulb
Cable
harness
2-1 All illumination lights
inoperative
2-2 Both taillights
inoperative
2-3 Taillight on the left (or
right) side inoperative
2-4 Both clearance lights
inoperative
2-5 Clearance light on the left
(or right) side inoperative
2-6
LHD-1
LHD-2
LHD-2
License 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
8D–171
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)
NO
YES
•
•
•
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?
YES
NO
GROUND R-4 SECURELY
REPAIR A POOR CONNECTION AT THE CONNECTORS OR AN
OPEN CIRCUIT BETWEEN 4 H-15 AND 10 H-32
8D–172
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?
YES
NO
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
WIRING SYSTEM
8D–173
1-4 Both Clearance Lights Inoperative
IS FUSE F-12 (15A) NORMAL?
•
•
YES
NO
REPLACE THE FUSE
REPLACE THE RELAY
REMOVE THE CONNECTOR OF THE LIGHTING SWITCH
•
IS THERE ANY CONTINUITY BETWEEN 8 B-12 AND
7 B-12 WHEN THE SWITCH IS TURNED TO THE CLEARANCE
LIGHT OR HEADLIGHT POSITION?
YES
NO
GROUND IT SECURELY
YES
NO
YES
NO
YES
NO
REPAIR A POOR CONNECTION AT THE CONNECTORS OR
AN OPEN CIRCUIT BETWEEN 4 X-9 AND 1 H-41
•
IS THE BATTERY VOLTAGE APPLIED BETWEEN THE
HARNESS SIDE CONNECTOR 8 B-12 AND THE GROUND?
REPAIR OR REPLACE THE LIGHTING
SWITCH
REPAIR A POOR CONNECTION AT
THE CONNECTORS OR AN OPEN
CIRCUIT BETWEEN 3 X-9 AND
8 B-12
•
IS THE TAIL RELAY NORMAL?
IS 1 C-16 GROUNDED SECURELY?
•
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