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
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