In the mechanism of power windows, instead of the gear reducer used in mechanical power windows, 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 a gearmotor windshield wiper.
The gear 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 is equipped with a built-in thermal bimetallic fuse.
Scheme of switching on the electric windows of the doors: 1 - mounting block; 2 – the switch of an electrowindow regulator of the right forward door; 3 - gearmotor of the power window of the right front door; 4 - gearmotor of the power window of the left front door; 5 - power window switch of the left front door; 6 - ignition switch; K5 - relay for switching on electric windows; A - to power supplies; B - to the outdoor lighting switch.
Gearmotors 3 and 4 (see fig.) are switched on by switches 2 and 5 located on the handles of the armrests. When the ignition is turned on, the supply voltage is supplied to the switches through the F6 fuse and the K5 power window relay, located in mounting block 1.
If the power windows do not work, it is necessary to remove the door upholstery and make sure that voltage is supplied to the gearmotors, check the fuse and power window relay, and restore the broken connections in the wires. Replace the defective gearmotor with a new one.
Data for checking the gearmotor:
- The frequency of rotation of the gearmotor shaft at idle at the supply voltage (13,5±0,1) In and ambient temperature (25±10) °C, min-1….56–90
- Consumed current at the specified load and speed, A..... 1.2–5.0
Removal and installation power windows front doors described in detail in section «Body».