Circuit ISUZU KB P190 2007 Workshop Repair Manual

ELECTRICAL-BODY AND CHASSIS 8A-157

CIRCUIT DIAGRAM 4JA1T (L), 4JH1-TC, 4JJ1-TC, 4JK1-TC (HALOGEN STD TYPE)






RTW 78AXF004201


BACK TO CHAPTER INDEX TO MODEL INDEXISUZU KB P190 2007

8A-158 ELECTRICAL-BODY AND CHASSIS

CIRCUIT DIAGRAM 4JA1T (L), 4JH1-TC, 4JJ1-TC, 4JK1-TC (HALOGEN PROJECTOR
TYPE)






RTW 78AXF004301

BACK TO CHAPTER INDEX TO MODEL INDEXISUZU KB P190 2007

ELECTRICAL-BODY AND CHASSIS 8A-159

CIRCUIT DIAGRAM 4JA1T (L), 4JH1-TC, 4JJ1-TC, 4JK1-TC (CLEARANCE LIGHT,
LICENSE PLATE LIGHT, TAIL LIGHT)


RTW 78AXF026701

BACK TO CHAPTER INDEX TO MODEL INDEXISUZU KB P190 2007

8A-160 ELECTRICAL-BODY AND CHASSIS
TROUBLE SHOOTING
HEADLIGHT
1. Both the headlights (high and low beam) do not light

Checkpoint Trouble Cause Countermeasure


Repair the wiring

Poor ground point contact

NG


Repair open circuit or
connector contact


Repair open circuit


Repair or replace the
combination switch


Voltage between 1
B60 -
ground


Open circuit between lighting
relay and lighting switch

Open circuit between battery
positiv e terminal and lighting
relay

Combination switch continuity

Poor switch contact or sw
faulty

Voltage between
5
X6 - ground and
2
X6 - ground


Reinstall or replace the
lighting relay

Lighting relay

Poor relay contact or relay
faulty

NG
NG
NG
NG
OK
OK
OK
OK

Ground point contact (C2),
(C36)

Repair open circuit

W iring continuity between
B60 - C2


Open circuit

NG
OK



BACK TO CHAPTER INDEX
TO MODEL INDEXISUZU KB P190 2007

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 â‹…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 â‹…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 â‹…passing
switchOpen circuit between
headlight and dimmer â‹…passing
switch
NG
OK



BACK TO CHAPTER INDEX
TO MODEL INDEXISUZU KB P190 2007

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 â‹…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 â‹…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



BACK TO CHAPTER INDEX
TO MODEL INDEXISUZU KB P190 2007

ELECTRICAL-BODY AND CHASSIS 8A-163
7. Passing light does not function when dimmer switch is operated

Checkpoint Trouble Cause Countermeasure


Repair or replace the dimmer
switch

Dimmer switch

Poor switch point contact

NG

Repair open circuit between
3
X6 - 3 B60

Voltage between
3
B60 - ground (Should
be battery v oltage present)


Open circuit

NG
OK



8. Headlight beam does not change when dimmer switch is operated

Repair or replace the dimmer
switchDimmer switchLoose beam lever or foreign
material in switch
NG




BACK TO CHAPTER INDEX TO MODEL INDEXISUZU KB P190 2007

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



BACK TO CHAPTER INDEX
TO MODEL INDEXISUZU KB P190 2007

ELECTRICAL-BODY AND CHASSIS 8A-165
3. License plate light does not light

Checkpoint Trouble Cause Countermeasure



Repair open circuit or
connector contact

Continuity between
connector 1
T4 - 2 T4 or 1

T3 - 2 T3

Open circuit or poor connector
contact

NG

Replace the bulb or repair
connector contact

License plate light bulb
continuity

Bulb burned out or poor
connector contact

NG
OK



4. Clearance light does not light

Replace the bulb or repair
connector contactClearance light bulb continuityBulb burned out or poor
connector contact
NG





BACK TO CHAPTER INDEX TO MODEL INDEXISUZU KB P190 2007

8A-168 ELECTRICAL-BODY AND CHASSIS
HALOGEN HEADLIGHT BULB (B type)
Removal
1. Open the bonnet.
2. Disconnect the headlight bulb connectors.

RTW 580SH000101
3. Turn the bulb counterclockwise to remove it.


Installation
To install the headlight, follow the removal procedure in
reverse order.
Pay close attention to the important points mentioned in the
following paragraphs.

Connector
Be absolutely sure that the headlight connector is securely
connected.
This will prevent a contact and an open circuit.


BACK TO CHAPTER INDEX TO MODEL INDEXISUZU KB P190 2007