Isuzu Trooper (1998-2002 year). Manual - part 951

8D–338

WIRING SYSTEM

Diagnosis

Quick Chart for Check Points

Check point

Fuse

Headlight

Headlight

Headlight

Alarm &

Cable

wiper

washer

relay

Trouble mode

C-7

C-4

wiper SW

motor

motor

control unit

harness

1. Headlight wipers and washer do not

operate on either side

2. Wiper on the left (or right) side does

not operate

3. Auto-stop function of the wiper on the

left (or right) side does not operate

4. Wiper on the left (or right) side does

not stop

5. Washer motor does not operate

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WIRING SYSTEM

8D–339

1.

Headlight Wipers And Washer Do Not Operate On Either Side

•

IS FUSE C-7 (10A) NORMAL?

YES

REPLACE THE FUSE C-7 (10A)

NO

•

TURN THE STARTER SWITCH ON

•

IS THE BATTERY VOLTAGE APPLIED BETWEEN
FUSE C-7 AND HEADLIGHT WIPER MOTOR
CONNECTOR TERMINAL 6 AND THE GROUND?

YES

NO

•

IS  B-19  GROUNDED SECURELY?

REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT
BETWEEN FUSE C-7 AND HEADLIGHT
WIPER MOTOR

YES

GROUND IT SECURELY

NO

•

DISCONNECT THE HEADLIGHT WIPER
SWITCH CONNECTOR

•

IS THE CONTINUITY IN THE SWITCH
NORMAL?

YES

NO

REPAIR OR REPLACE THE HEADLIGHT
WIPER SW

REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN 6   I-4    AND  B-19

8D–340

WIRING SYSTEM

•

DISCONNECT THE HEADLIGHT WIPER SWITCH
CONNECTOR

YES

REPAIR OR REPLACE THE HEADLIGHT
WIPER SWITCH

NO

•

DISCONNECT THE WIPER MOTOR CONNECTOR
THAT DOES NOT OPERATE

•

WITH THE SWITCH ON, IS THERE CONTINUITY
BETWEEN SWITCH CONNECTOR TERMINALS
7   I-4    AND 6   I-4    (5   I-4    AND 6   I-4    )?

•

TURN THE STARTER SWITCH ON

•

IS THERE BATTERY VOLTAGE APPLIED
BETWEEN THE HEADLIGHT WIPER MOTOR
HARNESS SIDE CONNECTOR 6  C-23  (6  C-30  )
AND GROUND?

YES

REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT
BETWEEN
(RHD)
6   C-23   (6   C-30   ) AND 15   H-7
(LHD)
6   C-23   (6   C-30   ) AND 11   H-8

NO

•

CONNECT THE MOTOR SIDE CONNECTOR
6  C-23  (6  C-30  )OF THE HEADLIGHT
WIPER MOTOR TO THE BATTERY (+)
TERMINAL AND 3  C-23  (3  C-30  ) TO THE
(–) TERMINAL

•

DOES THE MOTOR ROTATE?

YES

REPAIR OR REPLACE THE WIPER
MOTOR

NO

REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT BETWEEN 3  C-23  AND
7   I-4   (3  C-30  AND 5   I-4   )

2.

Wiper On The Left (Or Right) Side Does Not Operate

WIRING SYSTEM

8D–341

NOTE:

If headlight wiper motor auto-stop on both sides does not function, it may be attributable either to
headlight wiper switch trouble or to poor grounding of connector 

.

C-16

3.

Auto-stop Function Of The Wiper On The Left (Or Right) Side Does Not Operate

•

DISCONNECT THE HEADLIGHT WIPER SWITCH
CONNECTOR

YES

REPAIR OR REPLACE THE SWITCH

NO

•

RECONNECT THE HEADLIGHT WIPER SW
CONNECTOR AND DISCONNECT THE
HEADLIGHT WIPER MOTOR CONNECTOR

•

WITH THE SWITCH SET AT “OFF” POSITION, IS
THERE CONTINUITY BETWEEN THE SWITCH
CONNECTOR TERMINALS 7   I-4   AND 8   I-4
(4   I-4   AND 5   I-4   )?

•

IS THERE CONTINUITY BETWEEN
HARNESS SIDE CONNECTORS 3  C-23  AND
4  C-23   (3  C-30  AND 4   C-30  )?

YES

REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT
BETWEEN 4  C-23  AND 8   I-4
(4  C-30  AND 4   I-4   )

NO

•

WITH THE WIPER MOTOR CONNECTOR 6  C-23
(6  C-30  ) CONNECTED TO THE BATTERY (+)
TERMINAL, AND 3  C-23  (3  C-30  ) TO THE (–)
TERMINAL, ROTATE THE MOTOR.

•

WHILE ROTATING THE MOTOR, CHANGE THE
CONNECTION OF THE (–) TERMINAL TO
2  C-23  (2  C-30  ) AND CONNECT 3  C-23
(3 C-30  ) TO 4  C-23  (4  C-30  )

YES

REPAIR OR REPLACE THE HEADLIGHT
WIPER MOTOR

NO

REPAIR A POOR CONNECTION AT THE CONNECTORS
OR AN OPEN CIRCUIT
[LHD]
BETWEEN 2  C-23  (2  C-30 ) AND 4  C-16
[RHD]

BETWEEN 2  C-23  (2  C-30 ) AND 4  C-16

•

DOES THE MOTOR STOP AT THE AUTO-STOP
POSITION?