Isuzu N-Series. Service manual — part 1037

CAB AND CHASSIS ELECTRICAL 8-253

1-2. Windshield Wiper Does Not Operate at “INT” Position

1-3. Windshield Wiper Does Not Operate at “LO” Position

NO

• DISCONNECT THE CONNECTOR OF THE

INTERMITTENT RELAY

• IS THERE CONTINUITY BETWEEN THE RELAY AND

THE WINDSHIELD WIPER & WASHER SWITCH
HARNESS SIDE CONNECTOR 6 B-9 AND 8 B-69 ,
OR 3 B-9 AND 3 B-69 RESPECTIVELY?

REPAIR OR REPLACE WINDSHIELD WIPER &
WASHER SWITCH

YES

NO

REPLACE THE INTERMITTENT RELAY

REPAIR A POOR CONNECTION OR AN OPEN
CIRCUIT BETWEEN THE CIRCUITS

YES

• IS CONTINUITY IN THE WINDSHIELD WIPER &

WASHER SWITCH NORMAL?

N8A0255E

NO

• DISCONNECT THE WINDSHIELD WIPER MOTOR

CONNECTOR

• CONNECT THE BATTERY (+) TERMINAL TO THE

WINDSHIELD WIPER MOTOR CONNECTOR 2 B-11 AND
THE (-) TERMINAL TO 1 B-11

• DOES THE MOTOR ROTATE AT A LOW SPEED?

REPAIR OR REPLACE THE WINDSHIELD WIPER &
WASHER SWITCH

YES

NO

REPAIR A POOR CONNECTION AT THE CONNECTORS OR
AN OPEN CIRCUIT BETWEEN THE CONNECTORS 7 B-69
AND 2 B-11

REPAIR OR REPLACE THE WINDSHIELD WIPER
MOTOR

YES

• IS CONTINUITY IN THE WINDSHIELD WIPER & WASHER

SWITCH NORMAL?

N8A0256E

8-254 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 8-255

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

8-256 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