Isuzu N-Series. Service 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
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