Isuzu Trooper (1998-2002 year). Service manual — part 902
8D–142
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)
YES
NO
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
8D–143
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?
YES
NO
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?
YES
NO
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?
YES
NO
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?
YES
NO
REPAIR A POOR CONNECTION AT THE CONNEC-
TORS OR AN OPEN CIRCUIT BETWEEN 5 X-3
AND 15 B-12
REPAIR A POOR CONNECTION AT THE CONNECTOR OR AN
OPEN CIRCUIT BETWEEN 3 X-3 AND FUSE F-4 (10A)
8D–144
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?
YES
NO
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?
YES
NO
REPAIR AN OPEN CIRCUIT BETWEEN 16 B-12 AND
B-19
REPLACE THE RELAY
•
IS THERE CONTINUITY BETWEEN 16 B-12 AND
B-19 ?
YES
NO
•
IS THE HEADLIGHT BULB NORMAL?
YES
NO
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
8D–145
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
YES
NO
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
YES
NO
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 ?
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