Heating functions only at the included ignition. When heating is included, the control lamp in the switch burns.
While back glass pure, it is not necessary to include heating. Decrease in number of working consumers of a current promotes economy of fuel.
On cars with the electric drive of installation of external mirrors heating of a surface of mirrors joins at the same time with inclusion of heating of back glass.
On the cars intended for export to the countries with a frigid climate, heating of external mirrors joins at installation of external mirrors by means of the electric drive.
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