2007 ISUZU KB P190 Circuit

ELECTRICAL-BODY AND CHASSIS 8A-225

CIRCUIT DIAGRAM 4JA1T (L) Sheet 1/3







RTW 78AXF014701

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8A-226 ELECTRICAL-BODY AND CHASSIS

CIRCUIT DIAGRAM 4JA1T (L) Sheet 2/3






RTW 78AXF014801

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ELECTRICAL-BODY AND CHASSIS 8A-227

CIRCUIT DIAGRAM 4JA1T (L) Sheet 3/3






RTW 78AXF014901

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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


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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




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8A-230 ELECTRICAL-BODY AND CHASSIS
TURN SIGNAL LIGHT AND HAZARD WARNING LIGHT
1. Turn signal light does not light on both sides (RH and LH)

Checkpoint Trouble Cause Countermeasure



Replace the flasher unit

Flasher unit malfunction

NG

Repair or replace the
combination switch
Turn signal switch continuity
between connector
5
B60 - 6 B60 and
5
B60 - 7 B60 when
turn signal switch operates
Short circuit between
connector 3
B61 - 1 B61
when turn signal switch
operates with starter switch
in “ON” position (Turn
signal light should be ON)

Poor switch point contact or
faulty switch

NG
OK

Reinstall or replace fuse No.
EB16 (10A)

Fuse No. EB16 (10A, Fuse
box)

Poor fuse contact or blown
fuse

NG
OK
OK

Repair open circuit or
connector contact
Continuity between
connector 2
B61 -ground
(Should be continuity)


Open circuit or poor connector
contact

NG




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ELECTRICAL-BODY AND CHASSIS 8A-231
2. Turn signal light does not light on one side (RH or LH)

Checkpoint Trouble Cause Countermeasure



Repair open circuit or
connector contact

Open circuit or poor connector
contact

NG
(LH)
Continuity between
1
C25 - 6 B60 (FRT),
1
C35 - 6 B60 (SIDE)
1
F6 - 6 B60 (RR)
(RH)
Continuity between
1
C22 - 7 B60 (FRT),
1
C1 - 7 B60 (SIDE)
1
F5 - 7 B60 (RR)

Repair or replace the
combination switch

Turn signal switch continuity

Poor switch point contact or
faulty switch

NG
OK
OK

Repair open circuit or
connector contact

Open circuit or poor connector
contact

NG



3. Hazard warning light does not light



Repair or replace the hazard
SW .

Hazard SW . malfunction

NG
Voltage between 5
B16 -
ground (Should be battery
voltage present)

Hazard SW . continuity


Reinstall or replace the fuse
No. EB-16 (10A)

Fuse No. EB16 (10A, Relay
and fuse box)

Poor fuse contact or blown
fuse

NG
OK
OK

Repair open circuit or
connector contact
Open circuit or poor
connector contact between
fuse No. EB16 (10A) -
5
B16
NG



4. Flashing rate too fast (One side)

Replace the bulb or repair
open circuitInspect bulbBurned out bulb
NG


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8A-232 ELECTRICAL-BODY AND CHASSIS
BACKUP LIGHT
1. Backup light does not light on one side (RH or LH)

Checkpoint Trouble Cause Countermeasure

Repair grounding point contactPoor ground contact
NGGrounding point
Replace the bulb or repair
connector contactBackup light bulb continuityBurned out bulb or poor
connector contact
NG
OK



2. Backup light does not light on both sides



Repair or replace the switch

Poor switch point contact of
faulty switch

NG
Voltage between 5 F6
(5
F5 ) - ground with
starter switch ON and shift
lev er into rev erse position
(Should be battery v oltage
present)

Back up light switch (mode
switch) continuity


Reinstall or replace fuse No.
C10 (15A)

Fuse No. C10 (15A, Fuse
box)

Poor fuse contact or blown
fuse

NG
OK
OK

Repair open circuit or
connector contact

Open circuit or poor connector
contact

NG



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