2007 ISUZU KB P190 fuse

8A-46 ELECTRICAL-BODY AND CHASSIS

FUSE BLOCK CIRCUIT 4JH1-TC (LHD) Sheet 2/2


RTW 78AXF005301

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ELECTRICAL-BODY AND CHASSIS 8A-47

FUSE BLOCK CIRCUIT 4JA1T (L) Sheet 1/2






RTW 78AXF020801

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8A-48 ELECTRICAL-BODY AND CHASSIS

FUSE BLOCK CIRCUIT 4JA1T (L) Sheet 2/2





RTW 78AXF020901

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ELECTRICAL-BODY AND CHASSIS 8A-161
2. High or low beam does not light on both headlights

Checkpoint Trouble Cause Countermeasure


Repair or replace the
combination switch

Dimmer ⋅passing switch
continuity

Poor switch contact or switch
faulty

NG

Repair open circuit or
connector contact
Voltage between
4
X4 - ground and
4
B60 - ground

Open circuit between
headlight and dimmer ⋅passing
switch

NG
OK



3. RH (or LH) high and low beam does not light



Replace the headlight bulb

Headlight connector continuity

Blown filament or air leakage

NG

Repair or replace the wire
and/or connector
W iring continuity between
connector 3
C19 - fuse No.
EB7 or 3
C26 fuse No.
EB8

Open circuit and/or poor
connector contact

NG
OK

Reinstall or replace fuse No.
EB7 or No. EB8
Fuse No. EB7 (10A) or
No. EB8 (10A) (Relay and
fuse box)
(No. EB7 RH, No. EB8: LH)
Poor installation or blown fuse

NG
OK



4. High or low beam does not light on one headlight (RH or LH)

Replace the headlight
assemblyHeadlight connector continuityBlown filament
NG
Repair open circuit or
connector contactW iring continuity between
headlight and dimmer ⋅passing
switchOpen circuit between
headlight and dimmer ⋅passing
switch
NG
OK



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8A-162 ELECTRICAL-BODY AND CHASSIS
5. Headlight does not go out

Checkpoint Trouble Cause Countermeasure


Replace the lighting relay
Lighting relay continuity
between connector 1
X6
- 2
X6 (Should be no
continuity)

Relay point fused

NG

Replay the combination
switch Lighting switch continuity
between connector 3
B60
-1
B60 when switch is
OFF(S hould be no continuity)

point fused or faulty


NG
OK
OK

Repair or replace the
combination switch
Dimmer ⋅passing switch con-
tinuity between connector
3
B60 - 1 B60 when switch
is not operating
(Should be no continuity)

Switch point fused or faulty

NG
Repair short circuit
between 3
X6 - 3 B60
and 5
X2 - 2 B60
Check if headlight goes out
when connector
C2 , C36
is disconnected


Short circuit

NG
OK



6. Insufficient headlight brightness



Replace the headlight bulb

Headlight bulb

Bulb filament faulty

NG

Repair the wiring
Dimmer ⋅passing switch
W ire continuity between con-
nector 1
B60 - C2


Poor ground point contact

NG
OK

Clean the light lens

Headlight lens

Lens dirty

NG
OK



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8A-164 ELECTRICAL-BODY AND CHASSIS
TAIL LIGHT, LICENSE PLATE LIGHT, CLEARANCE LIGHT

1. All lights do not light

Checkpoint Trouble Cause Countermeasure



Repair or replace the
combination switch
Lighting switch continuity
between connector
2
B60 - 1 B60


Poor switch point or connector
contact

NG

Reinstall or replace the tail
relay

Tail relay


Poor relay contact or relay
faulty

NG
OK

Reinstall or replace the fuse
No. EB12 (LH), EB11 (RH)
Fuse No. EB12 (LH) or EB11
(RH) (10A, Relay and fuse
box)
Poor fuse contact or blown

NG
OK



2. Tail light does not light


Replace the bulb or repair
connector contact

Tail light bulb continuity

Bulb burned out or poor
connector contact

NG

Repair open circuit or
connector contact
Continuity between connector
3
F5 - 4 F5 (RH)
or 3
F6 - 4 F6 (LH)


Open circuit or poor connector
contact

NG
OK



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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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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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