ad6729s5000a

Rear window defroster diagnosis troubleshooting

Type ad · topic 67.29 · version 0103 · 2003-06-12

Applies to: MODEL 638 up to 15.5.98 with CODE (W62) Tailgate with window

Where it sits

Function group 3 Body › 67 Windows › 67.29 Heated rear window - electrical system — Series 638

AD67.29-S-5000A

Rear window defroster diagnosis troubleshooting

22.4.97

MODEL 638 up to 15.5.98 with CODE (W62) Tailgate with window

Rear window defroster, diagnosis, basic knowledge

AD67.29-S-2000A

a

Battery voltage > (11-14 V)

b

Rear window defroster complete, i.e. all connectors connected

If a fault is indicated, cables, fuses, plugs and connectors must be checked for open-circuit, good contact and correct connection in accordance with the relevant electric wiring diagram.

Troubleshooting

Complaint

Possible cause

Remarks

Remedy/test step

Indicator lamp does not come on after switching on even with engine running

Indicator lamp defective

Check indicator lamp
- Ground connection
- Control

AD67.29-S-6000-02A

Rear window defroster button

Check button
- Continuity through button

AD67.29-S-6000-04A

Power supply to rear window defroster relay

Check relay
- Input from control button
- Ground connection
- Power supply
- D+ signal

AD67.29-S-6000-05A

Indicator lamp comes on, however, heating element in rear window does not heat up

Power supply

Heating element/rear window

Check heating element
- Ground connection
- Power supply

AD67.29-S-6000-06A

Check relay
- Heating element output

AD67.29-S-6000-05A

Instrument lighting in button for rear window defroster does not operate

Power supply

Lamp

Check only when other instrument lighting operates properly.

Check wiring and connector to rear window defroster button.

Referenced documents