Pic. 7-41. Scheme of switching on the electric motor of the heater fan and heating elements of the exterior mirrors and rear window:
1 - ignition switch;
2 - mounting block;
3 - heater motor switch;
4 - additional resistor;
5 - heater electric motor;
6 - rear window heating element;
7 - heating element of the exterior mirror;
8 - switch for heating the rear window with a control lamp;
A - to power supplies;
K6 - additional relay;
K7 - relay for turning on the heated rear window.
The heating elements of mirrors and glass are switched on by means of an auxiliary relay K7 type 904.3747-10 installed in the mounting block.
Heating can only be turned on when the ignition is on, since voltage is supplied to switch 7 through an additional relay K6, which is triggered when the ignition is turned on.
Power is supplied to the heating elements through the contacts of the relay K7 from the fuse F8, which is directly connected to the power sources.
If the rear window or exterior mirrors are not heated when the heating is turned on, check fuse F8, wires and their connections, as well as switch and relay K7.