Schematic diagram of a typical power window system (BMW 5 Series E28)

1 - Rear section plug to driver's door (6 contacts)
2 - Rear section plug to center section (27 contacts)
3 —Wire plug for window lifter and central locking control to driver's door (13 contacts)
4 —Wire plug for window lifter and central locking to special equipment connection plug
5 — Rear left window switch
6 — Rear left window switch
7 — Rear right window switch
8 — Left rear door wire plug to left rear window lifter motor
9 — Right rear door wire plug to right rear window lifter motor
10 — Left rear window lift motor
11 — Right rear window lift motor
12 — Plug of the window lifter and central locking control wire to the left rear door
13 — Plug of the window lifter and central locking control wire to the right rear door (7 contacts)
14 — Power safety sensor
15 — Child safety sensor
16 — Front left window lift motor
17 — Front right window lift motor
18 — Driver's door wire plug to front left door motor
19 — Passenger door wire plug to passenger door window motor
20 — Relay
21 — Plug of the window lifter and central locking control wire to the passenger door (13 contacts)
22 — Front left window switch
23 — Rear right window switch
24 — Front right window switch