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Electrically heated rear

Electrically heated rear


1. Check that the fuses for the electrically heated rear window relay and the climate control unit or the heating/ventilation control panel are intact and live.


2. Plug in the scan tool and select "READ FAULT CODES" from the menu. If any trouble codes are present, continue on .


3. Select "READ SWITCHES" from the menu and then "REAR WINDOW HEATER". Read the scan tool display when the electrically heated rear window switch is activated.


Important

"READ SWITCHES" is only possible on cars with a manual ventilation fan since the ACC sends only a 100 ms pulse.

If this does not work, check the wiring between the ACC or the heating/ventilation control panel and ICE module pin 66 for breaks/shorting.


4. With the electrically heated rear window activated, disconnect its contacts. Take readings as follows:

• A 12 V supply should be present between one of the contacts and a good grounding point. Check the grounding of the electrically heated rear window as follows:

• The resistance should be < 1 ohm between the other contact and a good grounding point.

5. If the readings taken in point 4 are not OK, connect a jumper lead between connector pins 30 and 87 of the relay holder for the electrically heated rear window.


If the electrically heated rear window now works, change the relay.

If it does not work, check the wiring between relay connector pin 87 and the electrically heated rear window for breaks/shorting.

6. Check the electric heating element in the rear window.