Isuzu Trooper (1998-2002 year). 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  ?