Isuzu N-Series. Service manual - part 1033

CAB AND CHASSIS ELECTRICAL 8-237

Diagnosis

Quick Chart for Check Point

Notice:
 Figure in parenthesis “( )” indicates the order of inspection.

Check point

Fuse

F-16

 (10A)

F-6,

FL-26 

(20A,

30A) 

Power 

win-
dow 

relay

Power window 

SW

Power window 

motor

Cable 

har-

ness

Driver 

side

Pas-

senger 

side

Driver 

side

Pas-

senger 

side

Trouble
mode

All windows do not
operate

❍

(1)

❍

(2)

❍

(3)

❍

(5)

❍

(4)

Lock SW does not
function

❍

(1)

Driver side window

Window does not
operate

❍

(1)

❍

(2)

❍

(3)

One-touch opera-
tion does not oper-
ate

❍

(1)

Window operates in
only one direction

❍

(1)

Front passenger side
window

Window does not
operate

❍

(2)

❍

(1)

❍

(3)

❍

(4)

Window does not
operate when oper-
ating the driver side
SW

❍

(1)

❍

(2)

Window does not
operate when oper-
ating the passen-
ger side SW

❍

(1)

❍

(2)

Window operates in
only one direction
when operating the
driver side SW

❍

(1)

❍

(2)

Window operates in
only one direction
when operating the
passenger side SW

❍

(2)

❍

(1)

8-238 CAB AND CHASSIS ELECTRICAL

All Windows Do Not Operate

• IS FUSE  F-16  (10A) NORMAL?

YES

NO

REPLACE THE FUSE

• IS THE FUSE  F-6  or  FL-26  NORMAL?

• IS THE POWER WINDOW RELAY NORMAL?

YES

NO

REPLACE THE CIRCUIT BREAKER

• IS  B-7  SECURELY GROUNDED?

YES

NO

REPLACE THE RELAY

• DISCONNECT THE POWER WINDOW SW CONNECTOR

ON THE DRIVER SEAT SIDE

• TURN THE STARTER SW ON

• IS THE BATTERY VOLTAGE APPLIED BETWEEN THE

HARNESS SIDE CONNECTOR 6  D-3  AND THE
GROUND?

YES

NO

GROUND IT SECURELY

• IS THE BATTERY VOLTAGE APPLIED BETWEEN  B-7

AND THE GROUND?

YES

NO

REPLACE THE SWITCH

• IS THE POWER WINDOW SW ON THE DRIVER SIDE

NORMAL?

YES

NO

REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT BETWEEN 
6  D-3  AND 5  X-7  

NO

REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT BETWEEN 
8  D-3  AND  B-7  

N8A0230E

CAB AND CHASSIS ELECTRICAL 8-239

Lock Sw Does Not Function

Window on the Driver Side Does Not Operate

REPAIR OR REPLACE THE POWER WINDOW SW
ON THE DRIVER SEAT SIDE

N8A0231E

• IS THE POWER WINDOW SWITCH ON THE DRIVER

SEAT SIDE NORMAL?

• DISCONNECT THE CONNECTOR OF THE POWER

WINDOW MOTOR ON THE DRIVER SEAT SIDE

• WHEN CONNECTING THE MOTOR CONNECTOR 

1  D-2  TO THE BATTERY (+) TERMINAL AND 2  D-2
TO THE (-) TERMINAL, DOES THE MOTOR ROTATE IN
THE "UP" DIRECTION OF THE WINDOW (OR WHEN
CONNECTING 2  D-2  TO THE (+) TERMINAL AND 
1  D-2  TO THE (-) TERMINAL, DOES THE MOTOR
ROTATE IN THE "DOWN" DIRECTION OF THE
WINDOW)?

YES

NO

REPLACE THE POWER WINDOW SWITCH
ON THE DRIVER SEAT SIDE

REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN HARNESS SIDE
CONNECTOR TERMINALS 1  D-3  AND POWER
WINDOW MOTOR 1  D-2  OR 2  D-3  AND 2  D-2 

YES

NO

REPAIR OR REPLACE THE POWER WINDOW
MOTOR

N8A0232E

8-240 CAB AND CHASSIS ELECTRICAL

Window on the Front Passenger Side Does Not Operate

• IS THE FRONT PASSENGER SIDE POWER WINDOW

SW NORMAL?

• IS THE DRIVER´S POWER WINDOW SW NORMAL?

YES

NO

REPAIR OR REPLACE THE SW

• REMOVE THE CONNECTOR OF THE FRONT

PASSENGER SIDE POWER WINDOW MOTOR

• WHEN CONNECTING THE MOTOR CONNECTOR 

1  D-6  TO THE BATTERY (+) TERMINAL AND 2  D-6
TO THE (-) TERMINAL, DOES THE MOTOR ROTATE IN
THE "UP" DIRECTION OF THE WINDOW?  (OR WHEN
CONNECTING 2  D-6  TO THE (+) TERMINAL AND 
1  D-6  TO THE (-) TERMINAL, DOES THE MOTOR
ROTATE IN THE "DOWN" DIRECTION OF THE
WINDOW?)

YES

NO

REPAIR OR REPLACE THE SW

• WITH THE SWITCH AT THE NEUTRAL POSITION, IS

THERE ANY CONTINUITY BETWEEN THE HARNESS
SIDE CONNECTORS 1  D-6  AND 2  D-6 ?

YES

NO

REPAIR OR REPLACE THE POWER WINDOW
MOTOR

REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN 5  D-3  AND 2  D-7  
(OR 4  D-3  AND 4  D-7 )

YES

NO

REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT BETWEEN
THE PASSENGER SIDE POWER WINDOW SW
AND THE MOTOR CONNECTOR

N8A0233E