Isuzu KB P190. Manual — part 1303

8A-274 ELECTRICAL-BODY AND CHASSIS

2. Wiper dose not operate at “ INT “ position

Checkpoint

Trouble

Cause

Countermeasure

Replace the wiper & washer

SW.

SW. malfunction

NG

Repair grounding point contact

Grounding point

C36

(RHD),

C2

(LHD)

Poor grounding point contact

Repair open circuit or

connector contact

Voltage between the

intermittent relay harness side

connector terminal 4

C3

and the ground at the “INT”

position (Should be battery

voltage present)

Open circuit or poor connector

contact

NG

NG

OK

OK

Continuity between the wiper
& washer SW connector
terminals 4

B59

and 2

B59

at the “ INT “ position

Replace the intermittent relay

Intermittent relay function

Relay malfunction

NG

OK

3. Wiper does not operate at “LO” position

Replace the wiper motor

Wiper motor function

1. Disconnect the wiper &

washer SW. connector

2. Turn the starter SW. on

3. Short-circuit between the

wiper & washer SW.

harness side connector

terminal 3

B59

and

5

B59

.

4. Check to see if the wiper

motor rotates at a low

speed

Wiper motor malfunction

NG

Replace the wiper & washer

SW.

Wiper & washer SW. function

SW. malfunction

NG

OK

ELECTRICAL-BODY AND CHASSIS 8A-275

4. Wiper does not operate at “HI” position

Checkpoint

Trouble

Cause

Countermeasure

Repair open circuit or
connector contact

Open circuit or poor connector
contact

NG

Replace the wiper motor

Wiper motor function when
connecting the motor
connector 2

C4

to the

battery (+) terminal, and 1

C4

to the (-) terminal

(Should the wiper motor rotate
at a high speed)

Wiper motor malfunction

NG

OK

Continuity between the wiper
& washer SW. connector
terminals 4

B59

at the “HI”

position

Repair open circuit or
connector contact

Continuity between 4

B59

and 2

C4

Open circuit or poor connector
contact

NG

OK

5. Rotation of the wiper motor does not stop

Replace the wiper & washer

SW.

SW. malfunction

NG

OK

Continuity in the wiper &

washer SW.

Replace the wiper motor

Wiper motor function

Wiper motor malfunction

NG

8A-276 ELECTRICAL-BODY AND CHASSIS

6. Auto-stop function of the wiper motor does not operate

Checkpoint

Trouble

Cause

Countermeasure

Repair open circuit or
connector contact

Open circuit or poor connector
contact

NG

Repair open circuit or
connector contact

Open circuit or poor connector
contact

NG

Continuity between the
intermittent relay harness side
connector 6

C3

and the

wiper motor harness side
connector 6

C4

Replace the intermittent relay

Relay malfunction

NG

Intermittent relay function

Wiper motor function
1. Disconnect the wiper motor

connector

2. Connect the motor

connector 5

B59

to the

battery (+) terminal and
1

C4

to the (-) terminal,

and then change the
connection of the battery (+)
terminal to the connector
4

C4

while the motor

rotating at a low speed

3. Check to see if the wiper

motor stops at the auto stop
position when connecting
the connector terminals
3

C4

and 1

C4

in this

condition

Continuity between the wiper
& washer SW. connector
terminals 5

B59

and 6

B59

at the “OFF” position

OK

Replace the wiper motor

Wiper motor malfunction

NG

Repair an open circuit or a
poor connection of the
connectors between the fuse
No. C9 (20A) and 4

C4

Voltage between the wiper
motor harness side connector
terminal 4

C4

and the

ground (Should be battery
voltage present)

Open circuit or poor connector
contact

NG

OK

OK

OK

ELECTRICAL-BODY AND CHASSIS 8A-277

WASHER

1. Washer motor does not operate

Checkpoint

Trouble

Cause

Countermeasure

Reinstall or replace the fuse
No. C9 (20A)

Poor fuse contact or blown

NG

Repair or an open circuit or a
poor connection of the
connectors between 2

C17

and 1

B59

Open circuit or poor connector
contact

NG

Voltage between the washer
motor harness side connector
terminal 2

C17

and the

ground when the washer
button is depressed (Should
be battery voltage present)

Repair grounding point

C36

contact

Poor grounding point contact

NG

Grounding point

C36

Replace the washer motor

Motor malfunction

NG

Washer motor function when
connecting the motor side
connector 2

C17

to the

battery (+) terminal, and the
connector 1

C17

to the (-)

terminal (Should the washer
motor rotate)

OK

Repair open circuit or
connector contact

Open circuit or poor connector
contact

NG

Continuity between 1

C17

and

C36

OK

Continuity between the wiper
& washer SW. side connector
terminals 1

B59

and 7

B59

when the washer button is
depressed

Fuse No. C9 (20A)

OK

Replace the wiper & washer
SW.

SW. malfunction

NG

Repair or an open circuit or a
poor connection of the
connectors between the fuse
No. C-9 (20A) and 7

B59

Voltage between the wiper &
washer SW. harness side
connector terminal 7

B59

and the ground (Should be
battery voltage preset)

Open circuit or poor connector
contact

NG

OK

OK

OK