Isuzu Trooper (1998-2002 year). Manual - part 903

8D–146

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?

•

•

YES

NO

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

8D–147

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   )

8D–148

WIRING SYSTEM

Rear Fog Light

General Description

The circuit consists of the RR fog light, the FRT & RR
fog light SW, the RR fog light control unit, the RR fog
light relay, the RR fog light indicator, the tail relay
and the lighting SW.
The RR fog light is turned on by the RR fog light
control unit when the FRT fog light or the headlight
is on.

WIRING SYSTEM

8D–149

Circuit Diagram-1

D08RY00081

5.0

W

3.0

W

FL-1 80A

MAIN

F-8 20A

FRT FOG

F-12 15A

TAIL

TAIL

RELAY

BATT.(+)

3

X-9

1

X-9

0.85

R/B

0.85

R/B

0.85

G/R

0.3

BR/R

2.0

Y/R

0.3

BR/R

0.3

G

0.3

G

4

3

X-9

2

X-9

RR FOG

LIGHT

RELAY

FRT & RR

FOG LIGHT

SW

ILLUMINATION

CONTROLLER (3)

X-22

X-22

X-22

1.25

BR/Y

1.25

Y/R

3.0

Y/R

0.85

BR/Y

0.85

BR/Y

1.25

BR/Y

X-22

41

2

A

B

G

C

D

E

11

H-13

8

0.85

G/Y

0.85

G

0.85

G/R

0.3

R/G

RR

FRT

21

H

3

H-15

H-46

4

H-15

14

I-43

H-16

H-25

F

6

13

I-43

H-25

7

14

I-43

3

I-43

2

I-43