If there is a malfunction, first check the condition of the fuse in the fuse box.
If the fuse is OK, then check the reliability of the contacts of the plug connectors on the left and right of the rear window, and if necessary, clean the contacts from corrosion.
If the rear window heating still does not work, check the supply electrical wires and the switch.
Check the filament. Measure the voltage between the filament and the connection point of the supply electric wire. To do this, wrap the pointed electrode of the measuring device with a wide foil strip and press it to the filament "arrow" during the measurement.
Start the engine and turn on the rear window defroster.
Measure the voltage in the middle of each section of the filament. If this voltage is about 6 volts, then the filament is OK. If the voltage is about 10 volts or 0 volts, then the filament is broken.
By moving the pointed electrode along the sections of the filament, you can determine the location of the break. This is the place where the voltage jumps from zero to several volts.
If the filament is damaged, the electrical circuit can be restored by applying a silver-based conductive varnish. To do this, the damaged area "A" must be cleaned beforehand.
Cover the damaged area "A" on both sides with adhesive tape "B" as shown in the picture and apply varnish "C" with a thin brush.
Dry the varnish at a temperature of approximately +25°C for approximately 24 hours. You can also use a technical hair dryer for drying. At a temperature of +150°C the varnish dries in approximately 30 minutes.
The information is available on the website [VWManual.ru]
Caution: Do not turn on the rear window heating until the varnish is completely dry. Do not use gasoline or other solvents to clean the damaged area.
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