Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 1388

ELECTRICAL-BODY AND CHASSIS  8-117

CIRCUIT DIAGRAM (RHD)

8-118  ELECTRICAL-BODY AND CHASSIS

TROUBLESHOOTING

WINDSHIELD WIPER

1. Wiper dose not operate at any switch position

Checkpoint

Trouble Cause

Countermeasure

Reinstall or replace the fuse

No. CB-8 (20A) (RHD: CB-6

(20A) )

Poor fuse contact or blown

NG

Repair open circuit or

connector contact

1. Wiper motor function when

connecting the motor
connector 2 

C-4

 to the

battery (+) terminal, and 3

C-4

 to the (-) terminal

(Should the wiper motor
rotate at a low speed)

2. Wiper motor function when

connecting the motor
connector 1 

C-4

 to the

battery (+) terminal, 3 

C-4

to the (-) terminal (Should
the wiper motor rotate at a
high speed)

Voltage between 3 

C-43

 and

the ground (Should be battery

voltage present)

Open circuit or poor connector

contact

Replace the wiper & washer

SW.

Continuity in the wiper &

washer SW.

SW. malfunction

NG

NG

OK

OK

LHD:
Fuse No. CB-8 (20A)
RHD:
Fuse No. CB-6 (20A)

Repair grounding point

(

C-2

) contact

Grounding point (

C-2

)

Poor grounding point contact

NG

OK

OK

Replace the wiper motor

Wiper motor malfunction

NG

Repair open circuit or

connector contact

Continuity between 3 

C-4

and 

C-2

Open circuit or poor connector

contact

NG

OK

ELECTRICAL-BODY AND CHASSIS  8-119

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 

C-2

Poor rounding point contact

Repair open circuit or

connector contact

Voltage between the

intermittent relay harness side

connector terminal 4 

C-3

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 3 

C-43

 and 2 

C-43

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

terminals.

3.

C-43

 and 5 

C-43

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

8-120  ELECTRICAL-BODY AND CHASSIS

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

connector1 

C-4

 to the

battery (+) terminal, and 3

C-4

 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 3 

C-43

 and 4 

C-43

at the “HI” position

Repair open circuit or

connector contact

Continuity between 4 

C-43

and1 

C-4

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