Checking the heating of the rear window should take place in wet weather or frosted glass. The heating elements fixed on the glass must create free visibility on the entire surface.
1. Check the appropriate fuse, see section Electrical wires and fuses.
2. Check the tightness of the connection between the connector and the heating element.
3. Remove and check switches.
4. Check if the relay is OK.
5. If no fault is found, check the wiring.
6. If the heating filaments are damaged and torn, silver lacquer can be used for repair. It is produced, for example, by Doduco and can be purchased at an auto parts store. You can also buy a repair kit from a Renault auto parts store.