Isuzu KB P190. Manual — part 1341

8A-426 ELECTRICAL-BODY AND CHASSIS

CIRCUIT DIAGRAM 4JJ1-TC/4JK1-TC 4JH1-TC G.EXP

RTW78AXF028101

ELECTRICAL-BODY AND CHASSIS 8A-427

TROUBLESHOOTING

QUICK CHART FOR CHECK POINTS

Check Points

Trouble Mode

Power
Window
& Door
Lock
Switch

Power Window Switch

Power Window Motor

Driver’s

Side

Passenger’s

Side

RR-LH

RR-

RH

Driver’s

Side

Passenger’s

Side

RR-LH

RR-

RH

All windows will not operate

Lock SW does not function

Driver’s

Window:

Window does not operate

One-touch operation for
“DOWN” movement will not
operate

Window operates in only
one direction

Front window on passenger
seat side:

Window does not operate

Window does not operate
when operating the driver’s
SW

Window does not operate
when operating the
passenger’s SW

Window does operate in
only one direction when
operating the driver’s SW

Window does operate in
only one direction when
operating the passenger’s
seat side SW

Rear window on left (or right)
side:

Window on left (or right)
side does not operate

Window does not operate
when operating the driver’s
SW

Window does operate in
only one direction when
operating the driver’s SW

Window does operate in
only one direction when
operating the RR-LH (or
RH) side SW

Cable

Harness

Relay;
Power

Window

SBF9

C20

8A-428 ELECTRICAL-BODY AND CHASSIS

1. All windows do not operate

Checkpoint

Trouble

Cause

Countermeasure

Reinstall or replace the fuse
C20 (30A)

Poor fuse contact or blown

NG

Replace the circuit breaker
C20 (50A or 60A)

C20 (50A or 60A Fuse box)
function

Circuit breaker malfunction

Repair grounding points
contact

Grounding points

C2

Poor grounding point contact

NG

NG

OK

OK

OK

Fuse C20 (30A, Fuse box)

Replace the power window
relay

Power window relay
malfunction

NG

Repair an open circuit or a
poor connection of the
connectors between 1

C108

and 2

B8

Voltage between the power
window relay harness side
connector terminal 2

B8

and the ground (Should be
battery voltage present)

Open circuit or poor connector
contact

NG

OK

Power window relay function

OK

Repair an open circuit or a
poor connection of the
connectors between 1

B8

and 1

B56

and 6

D5

Open circuit or poor connector
contact

NG

Voltage between 6

D5

and

the ground (Should be battery
voltage present)

OK

Repair an open circuit or a
poor connection of the
connectors between 3

D5

and

C2

, or 3

B8

(12

C107

) and

C109

Open circuit or poor connector
contact

NG

Continued on the next page

Voltage between 3

D5

or 3

B8

and the ground

ELECTRICAL-BODY AND CHASSIS 8A-429

Checkpoint

Trouble

Cause

Countermeasure

Replace the driver seat side

power window & door lock

SW.

SW. malfunction

OK

NG

Driver seat side power window

& door lock SW. function

Continued from the previous page

2. Lock switch does not function

Checkpoint

Trouble

Cause

Countermeasure

Replace the driver seat side

power window & door lock

SW.

SW. malfunction

NG

Driver seat side power window

& door lock SW. function

3. Window on the driver’s side does not operate

Checkpoint

Trouble

Cause

Countermeasure

Replace the driver seat side
power window & door lock
SW.

SW. malfunction

NG

Replace the driver seat side
power window motor

Motor malfunction

NG

OK

Driver seat side power
window & door lock SW.
function

OK

Repair open circuit or
connector contact

Open circuit or poor connector
contact

NG

Continuity between 7

D5

and 1

D1

, or 8

D5

and 2

D1

1. Driver seat side power

window motor function
when connection the motor
connector 1

D1

to the

battery (+) terminal, and 2

D1

to the (-) terminal

(Should the motor rotate in

the “UP” direction of the
window)

2. Driver seat side power

window motor function
when connecting the motor
connector 2

D1

to the

battery (+) terminal, and 1

D1

to the (-) terminal

(Should the motor rotate in

the “DOWN” direction of
the window)