Mercedes S-Class W-220

since 1998 release

Repair and operation of the car

Mercedes W220
+ Mercedes-Benz cars of the class S (W220)
+ Operation manual
+ Routine maintenance
+ Engine
+ Cooling system and heating
+ Power supply system and release
+ Engine electric equipment
+ Automatic transmission
+ Power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
- Onboard electric equipment
   Diagnostics of malfunctions of onboard electric equipment - the general information
   Check of the electric motor of a screen wiper
   Check of the warmed back glass
   Replacement of glow lamps
   Function of reserve light
   Electric safety locks
   Installation of electric and electronic devices
   Elements of the uniform lock
   Arrangement of the basic electric elements of system of electric equipment of a body of the car
   Anticreeping alarm system
+ Schemes of electric equipment

Check of the warmed back glass

At inclusion of heating of back glass the field with visible lines of wires has to be freed from a covering or snow after a while.


1. With malfunctions check at first a safety lock in the block of safety locks.
2. If a safety lock as it should be, remove facing of back glass and check reliability of connection of the plug at glass at the left and on the right. If necessary clear of corrosion.
3. If heating still does not work, check the module of control of comfort electric equipment.

4. If conductors of a heater are torn, it is possible to use a usual conducting varnish for repair. For this purpose clear the damaged place a thinner or ethylene.

5. Paste over the damaged place on both sides of the gluing tape and put with a small brush a conducting varnish.
6. Dry paint at a temperature about +25 °C within 24 hours. For this purpose it is possible to apply also hot air. At a temperature of +150 °C paint dries within 30 min.

 Attention! Do not include heating of back glass before paint completely does not dry. Do not apply gasoline or other solvents to cleaning of the damaged elements.