1. Check the fuse first if the heater is not working.
2. Remove the rear door trim and check the rear window defroster power wires if the fuse is OK.
If the heater still does not work, then check the wires, the switch and the switching unit.
If the heating filaments are broken, they can be restored using a conductive silver-based varnish, which is commercially available. To do this, clean the damaged area with thinner or ethylene.
3. Tape the damaged area A on both sides with adhesive tape B and apply conductive varnish C with a brush (see illustration).
9.3 Tape both sides of the damaged area A with adhesive tape B and apply conductive varnish C with a brush
4. Let the varnish dry for 24 hours at +25°C. If necessary, you can use a hairdryer. At a temperature of +150°C, the varnish dries in about 30 minutes.
Attention! Do not turn on the rear window defroster until the varnish is dry. Do not use petrol or other solvents on a damaged filament.