In the event of 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 at the rear window, if necessary, clean the contacts from corrosion.
If there is still no heated rear window, check the electrical leads and switch.
Check filament. Measure the voltage between the filament and the connection point of the electrical supply wire. To do this, wrap a wide piece of foil around the pointed electrode of the measuring device and press it against the filament -arrow- during the measurement.
Start the engine and turn on the heated rear window glass.
Measure the voltage in the middle of each section of the filament. If this voltage is about 6 volts, then the filament is good. If the voltage is about 10 volts or 0 volts, then the thread 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 there is a voltage jump from zero to several volts.
If the filament is damaged, the electrical circuit can be restored by applying a silver-based electrically conductive varnish. To do this, first clean the damaged area -A-.
Tape off the damaged area -A- on both sides with adhesive tape -B- as shown in the figure 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 hair dryer to dry. At a temperature of +150°C, the varnish dries in about 30 minutes.
Attention: Do not turn on the heated rear window until the varnish is completely dry. Do not use gasoline or other solvents to clean the damaged area.
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