Rear window defroster diagnosis troubleshooting

AD67.29-D-5000A

Rear window defroster diagnosis troubleshooting

26.2.98

Rear window defroster diagnosis, previous knowledge

AD67.29-D-2000A

 Observe prerequisites for troubleshooting

Rear window defroster, testing electrical system

AD67.29-D-6000A

Troubleshooting

Complaint

Possible cause

Note

Remedy

The indicator lamp does not come on after switching on when the engine is running and rear windows do not heat up

Rear window defroster button

Check button

- Continuity

- Voltage supply

AD67.29-D-6000-04A

Rear window defroster relay

Check relay

- Button input

- Ground point

- Voltage supply

- D+ signal

- Rear window output

AD67.29-D-6000-05A

Heating element/rear window

Check heating element

- Ground point

- Voltage supply

AD67.29-D-6000-06A

Indicator lamp comes on but rear windows do not heat up.

Rear window defroster relay

Check relay

- D+ signal

- Heating element output

AD67.29-D-6000-05A

Heating element/rear window

Check heating element

- Ground point

- Voltage supply

AD67.29-D-6000-06A

The indicator lamp does not come on after switching on when the engine is running but rear windows heat up

Rear window defroster button

Check indicator lamp

AD67.29-D-6000-02A