Isuzu Trooper (1998-2002 year). Manual — part 944
8D–310
WIRING SYSTEM
Diagnosis
Quick Chart for Check Points
Check point
Fuse
C-5 (15A)
Wiper &
washer
SW
Alarm &
relay
control unit
Wiper
motor
Cable
harness
1
Windshield wiper does not operate at
any position
Trouble mode
2
Windshield wiper does not operate at
“INT” position
3
Intermittent interval does not change
4
Windshield wiper does not operate at
“LO” position
5
Windshield wiper does not operate at
“HI” position
6
Auto-stop function of the windshield
wiper motor does not operate
7
Rotation of the front wiper motor does
not stop
Washer
motor
8
Windshield washer motor does not
operate
WIRING SYSTEM
8D–311
1 Windshield Wiper Does Not Operate At Any Switch Position
REPAIR OR REPLACE THE SWITCH
•
IS FUSE C-5 (15A) NORMAL?
YES
•
•
•
DISCONNECT THE CONNECTOR OF THE WINDSHIELD WIPER &
WASHER SWITCH
TURN THE STARTER SWITCH ON
IS THERE ANY BATTERY VOLTAGE APPLIED BETWEEN THE
SWITCH HARNESS SIDE CONNECTOR 3 B-52 AND THE
GROUND?
REPLACE THE FUSE
NO
YES
NO
•
IS THE CONTINUITY IN THE WINDSHIELD WIPER & WASHER
SWITCH NORMAL?
REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT BETWEEN THE
FUSE C-5 (15A) AND 3 B-52
YES
NO
•
IS 2 C-39 GROUNDED SECURELY?
YES
NO
•
•
•
DISCONNECT THE CONNECTOR OF THE WINDSHIELD WIPER MOTOR
WITH THE MOTOR CONNECTOR 2 C-38 CONNECTED TO
THE BATTERY (+) TERMINAL, AND THE CONNECTOR 3 C-38 TO
THE (–) TERMINAL, DOES THE MOTOR ROTATE AT A LOW
SPEED?
AND WITH THE CONNECTOR 1 C-38 CONNECTED TO THE (+)
TERMINAL, DOES THE MOTOR ROTATE AT A HIGH SPEED?
GROUND IT SECURELY
REPAIR A POOR CONNECTION AT THE CONNECTORS OR AN OPEN
CIRCUIT BETWEEN 3 C-38 AND THE GROUND
REPAIR OR REPLACE THE WINDSHIELD WIPER MOTOR
YES
NO
8D–312
WIRING SYSTEM
2 Windshield Wiper Does Not Operate At “INT” Position
•
•
•
DISCONNECT THE CONNECTORS OF THE WINDSHIELD WIPER &
WASHER SWITCH
SET THE SWITCH AT THE “INT” POSITION
IS THERE CONTINUITY BETWEEN THE SWITCH CONNECTOR
TERMINALS 3 B-52 AND 2 B-52 ?
YES
NO
•
•
•
DISCONNECT THE CONNECTOR OF THE ALARM & RELAY
CONTROL UNIT
SET THE WINDSHIELD WIPER & WASHER SWITCH AT THE "INT"
POSITION AND TURN THE STARTER SWITCH ON
IS THE BATTERY VOLTAGE APPLIED BETWEEN 20 B-7 AND
THE GROUND?
REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN 14 B-52 AND B-19
YES
NO
•
IS B-19 GROUNDED SECURELY?
REPAIR OR REPLACE THE WINDSHIELD WIPER &
WASHER SWITCH
YES
NO
GROUND IT SECURELY
•
IS THERE CONTINUITY BETWEEN THE WINDSHIELD WIPER &
WASHER SWITCH HARNESS SIDE CONNECTOR TERMINALS
14 B-52 AND THE GROUND?
YES
NO
REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN 2 B-52 AND 20 B-7
•
IS THERE CONTINUITY BETWEEN 14 B-6 AND 8 B-52 ?
YES
NO
REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN 14 B-6 AND
8 B-52
REPLACE THE ALARM & RELAY CONTROL UNIT
WIRING SYSTEM
8D–313
3 Intermittent Interval Does Not Change
•
•
DISCONNECT THE CONNECTOR OF THE WINDSHIELD
WIPER & WASHER SWITCH
WHEN THE INTERMITTENT KNOB IS TURNED, DOES THE
RESISTANCE VALUE BETWEEN THE SWITCH CONNECTOR
TERMINALS 8 B-52 AND 14 B-52 VARY BETWEEN 0
Ω
- 2 K
Ω
?
YES
NO
REPAIR OR REPLACE THE SWITCH
IS THERE SHORT CIRCUIT BETWEEN 14 B-6 AND 8 B-52 ?
•
YES
NO
REPAIR A SHORT CIRCUIT
REPLACE THE ALARM & RELAY
CONTROL UNIT
4 Windshield Wiper Does Not Operate At “LO” Position
•
•
•
DISCONNECT THE CONNECTORS OF THE WINDSHIELD WIPER &
WASHER SWITCH
TURN THE STARTER SWITCH ON
SHORT CIRCUIT THE WINDSHIELD WIPER & WASHER SWITCH HAR-
NESS SIDE CONNECTOR TERMINALS 3 B-52 - 5 B-52 AND
CHECK TO SEE IF THE WINDSHIELD WIPER MOTOR ROTATES AT A
LOW SPEED.
REPAIR OR REPLACE THE WIPER & WASHER SWITCH
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