Isuzu KB P190. Manual — part 1291

8A-226 ELECTRICAL-BODY AND CHASSIS

CIRCUIT DIAGRAM 4JA1T (L)

Sheet 2/3

RTW78AXF014801

ELECTRICAL-BODY AND CHASSIS 8A-227

CIRCUIT DIAGRAM 4JA1T (L)

Sheet 3/3

RTW78AXF014901

8A-228 ELECTRICAL-BODY AND CHASSIS

TROUBLESHOOTING

STOPLIGHT AND HIGH MOUNTED STOPLIGHT

1. One side of stoplight does not light

Checkpoint

Trouble

Cause

Countermeasure

Replace the bulb or repair

connector contact

Burned out bulb or poor

connector contact

NG

Repair open circuit or

connector contact

Repair open circuit or

connector contact

Open circuit or poor connector

contact

Continuity between
9

H9

- 2

F6

(LH) (or

2

F5

(RH))

Open circuit or poor connector

contact

Continuity between

C109

- 4

F6

(LH) (or

4

F5

(RH))

NG

NG

OK

OK

Stoplight bulb continuity

2. Both sides of stoplight do not light

Adjust the switch installation

position

Stop light switch (or brake

switch) function

Incorrect the switch installation

or adjustment

NG

Repair open circuit or

connector contact

Voltage between 2

F6

ground or 2

F5

- ground

with brake pedal depressed

(Should be battery voltage

present)

Open circuit or poor connector
contact between stoplight
switch (or brake switch) and
stoplight

NG

OK

Reinstall or replace fuse No.

SBF9 (50A or 60A)

or 1

C108

- 4

C107

Fuse No. C15 (15A)

Fuse No. SBF-9 (50A, Fuse

and Relay box)

or 1

C108

- 4

C107

Fuse No. C15 (15A)

Poor fuse contact or blown

NG

OK

ELECTRICAL-BODY AND CHASSIS 8A-229

3. High mounted stoplight does not light

Checkpoint

Trouble

Cause

Countermeasure

Repair or replace the high

mounted stoplight

Continuity between 3

L5

-

1

L5

High mounted stoplight

malfunction

NG

Repair an open circuit or

connector contact between

3

L5

- 13

H18

(RHD) or

10

H48

(LHD)

Voltage between 1

L5

-

ground with brake pedal

depressed

(Should be battery voltage

present)

Open circuit or poor connector

contact

NG

OK

Repair grounding point contact

C2

Grounding point

C2

Poor grounding point contact

NG

OK