In the window regulator mechanism, instead of the gear reducer used in mechanical window regulators, there is only a drum into the hole of which the output shaft of the gearmotor is inserted.
The geared motor consists of a worm gear and a DC motor with permanent magnet excitation. Its design is similar to that of the windshield wiper gearmotor. The geared motor is reversible, the direction of rotation of the output shaft depends on the direction of the current in the armature winding. For protection against overloads, it has a built-in thermal bimetallic fuse.
The scheme of switching on the power windows is shown in fig. 7-44. Gearmotors 4 and 5 are switched on by switches 3 and 6 located on the handles of the armrests. Voltage is supplied to the switches through fuse F5 only when the ignition is on, when the contacts of the relay 2 of the power windows are closed. The relay is applied type 904.3747-11 or 904.3747-11A. The relay is located to the left of the steering column on a bracket attached to the mounting block.
Pic. 7-44. The scheme of switching on the electric windows of the doors:
1 - mounting block;
2 - relay for switching on electric windows;
3 - power window switch of the right front door;
4 - gearmotor of the power window of the right front door;
5 - gearmotor of the power window of the left front door;
6 - power window switch of the left front door;
7 - APS control unit;
A - to power supplies;
B - to the outdoor lighting switch.
If the power windows do not work, then it is necessary to remove the door upholstery and check whether voltage is supplied to the gearmotors, check the fuse and relay of the power windows, restore the broken connections in the wires, replace the faulty gearmotor with a new one.