Isuzu N-Series. Manual - part 1138

8-264 CAB AND CHASSIS ELECTRICAL

1-4. Windshield Wiper Does Not Operate at “HI” Position

NO

• DISCONNECT THE WINDSHIELD WIPER MOTOR

CONNECTOR

• CONNECT THE BATTERY (+) TERMINAL TO THE

WINDSHIELD WIPER MOTOR CONNECTOR 3  B-11  AND
THE (-) TERMINAL TO 1  B-11

• DOES THE MOTOR ROTATE AT A HIGH SPEED?

REPAIR OR REPLACE THE WINDSHIELD WIPER &
WASHER SWITCH

YES

NO

REPAIR OR REPLACE THE WINDSHIELD WIPER
MOTOR

YES

• IS CONTINUITY IN THE WINDSHIELD WIPER &

WASHER SWITCH NORMAL?

REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN 4  B-69  AND 3  B-11 

N8A0257E

CAB AND CHASSIS ELECTRICAL 8-265

1-5. Auto-stop Function of The Windshield Wiper Motor Does Not Operate

NO

• DISCONNECT THE CONNECTOR OF THE WINDSHIELD

WIPER MOTOR

• CONNECT THE MOTOR CONNECTOR 2  B-11  TO THE

BATTERY (+) TERMINAL, AND 1  B-11  TO THE BATTERY
(-) TERMINAL, AND THEN CHANGE THE CONNECTION
OF THE BATTERY (+) TERMINAL TO THE CONNECTOR 4 

B-11  WHILE ROTATING THE MOTOR AT A LOW SPEED

• WHEN CONNECTING THE CONNECTOR TERMINALS 2 

B-11  AND 5  B-11  IN THIS CONDITION, DOES THE

MOTOR STOP AT AUTO-STOP POSITION?

REPAIR OR REPLACE THE WINDSHIELD WIPER &
WASHER SWITCH

NO

YES

YES

NO

NO

YES

• TURN THE STARTER SWITCH ON

• IS THERE BATTERY VOLTAGE APPLIED BETWEEN THE

WINDSHIELD WIPER MOTOR HARNESS SIDE
CONNECTOR TERMINAL 4  B-11  AND GROUND?

• DISCONNECT THE CONNECTOR OF THE WINDSHIELD

INTERMITTENT RELAY

• IS THERE CONTINUITY BETWEEN THE RELAY HARNESS

SIDE CONNECTOR 7  B-9  AND THE WINDSHIELD WIPER
MOTOR HARNESS SIDE CONNECTOR 5  B-11  ?

REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT BETWEEN
THE FUSE  F-10  (15A) AND 4  B-11

REPLACE THE WINDSHIELD INTERMITTENT RELAY

REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT BETWEEN
THE CIRCUITS

REPAIR OR REPLACE THE WINDSHIELD WIPER
MOTOR

YES

• IS CONTINUITY IN THE WINDSHIELD WIPER &

WASHER SWITCH NORMAL?

N8A0258E

8-266 CAB AND CHASSIS ELECTRICAL

1-6. Rotation of The Windshield Wiper Motor Does Not Stop

NO

• THE MOMENT THE WINDSHIELD WIPER COMES TO

AUTO-STOP POSITION, TURN THE STARTER SWITCH
OFF
(ALTERNATIVELY, CONNECT THE BATTERY (+)
TERMINAL TO THE WINDSHIELD WIPER MOTOR
CONNECTOR 2  B-11  AND THE (-) TERMINAL TO 1 

B-11  , AND THEN MOVE THE WINDSHIELD WIPER

MOTOR TO AUTO-STOP POSITION AND STOP IT)

REPAIR OR REPLACE THE WINDSHIELD WIPER &
WASHER SWITCH

YES

CONFIRM CONTINUITY BETWEEN THE WINDSHIELD
WIPER MOTOR SIDE CONNECTOR TERMINALS 4  B-11
AND 5  B-11  , AND REPAIR OR REPLACE THE MOTOR

YES

• IS CONTINUITY IN THE WINDSHIELD WIPER &

WASHER SWITCH NORMAL?

N8A0259E

CAB AND CHASSIS ELECTRICAL 8-267

1-7. Windshield Washer Motor Does Not Operate

NO

NO

NO

NO

NO

• TURN THE STARTER SWITCH ON

• IS THE BATTERY VOLTAGE APPLIED BETWEEN THE

WINDSHIELD WIPER & WASHER SWITCH HARNESS
SIDE CONNECTOR TERMINAL 1  B-69  AND THE
GROUND?

• DISCONNECT THE CONNECTOR OF THE WINDSHIELD

WASHER MOTOR

• TURN THE STARTER SWITCH ON

• WITH THE WASHER BUTTON OF THE WINDSHIELD

WIPER & WASHER SWITCH DEPRESSED, IS THE
BATTERY VOLTAGE APPLIED BETWEEN THE WASHER
MOTOR HARNESS SIDE CONNECTOR TERMINAL 1  B-8
AND THE GROUND?

• IS  B-7  GROUNDED SECURELY?

• CONNECT THE MOTOR SIDE CONNECTOR 1  B-8  OF

THE WINDSHIELD WASHER MOTOR TO THE BATTERY
(+) TERMINAL, AND THE CONNECTOR 2  B-8  TO THE (-)
TERMINAL

• DOES THE MOTOR ROTATE?

REPAIR A POOR CONNECTION AT THE CONNECTORS OR
AN OPEN CIRCUIT BETWEEN 2  B-8  AND  B-7 

REPAIR OR REPLACE THE WINDSHIELD WIPER &
WASHER SWITCH

REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT BETWEEN
FUSE  F-10  (15A) AND 1  B-69 

REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT BETWEEN 1 

B-8  AND 6  B-69 

GROUND IT SECURELY

REPAIR OR REPLACE THE WINDSHIELD WASHER
MOTOR

YES

YES

YES

YES

YES

• IS CONTINUITY IN THE WINDSHIELD WIPER & WASHER

SWITCH NORMAL?

N8A0260E