Typical schematic diagram for central door locking, anti-theft alarm, trip computer, auxiliary heater and digital clock (BMW 5 Series E28)

A typical schematic diagram of a central door locking system, anti-theft alarm, trip computer, additional heater and digital clock

1 - Plug - rear section to center section
2 — Plug connector for connecting special equipment
3 — Connector for the central door locking control unit
4 — Electronic control unit for central door locking (a-pillar end disk)
5 - Plug - driver's door wiring to the rear section
6 — Plug - connecting wire of the central locking system to the driver's door wiring (13 contacts)
7 — Plug - connecting wire of central locking to wiring of door on passenger side
8 — Plug - wire of the central locking system in the driver's door to the switch
9 — Central locking switch/release locking mechanism (driver's door, locked)
10 — Connection of the central locking motor to the driver's door (6 contacts)
11 — Central locking motor - driver's door
12 — Plug - passenger door wiring to microswitch
13 - Microswitch (passenger door, locked)
14 — Central locking motor - passenger door
15 — Central locking motor - passenger door
16 — Connection of the central locking motor to the trunk lid (6 contacts)
17 — Central locking motor - trunk lid
18 — Connecting the central locking motor to the fuel tank filler cap (6 contacts)
19 — Central locking motor - fuel tank filler cap
20 — Connection of the central locking motor to the rear left door (6 contacts)
21 — Central locking motor - rear left door
22 — Connection of the central locking motor to the right door (6 contacts)
23 — Plug - connecting wire of central locking to the right rear door (7 contacts)
24 — Plug - connecting wire of central locking to the left rear door (7 contacts)
25 — Central locking motor - right rear door
26 — Rear window defroster switch
27 — Electronic control unit for the anti-theft system (to the left of the steering column)
28 — Connector of the electronic control unit of the anti-theft system (26 contacts)
29 — Relay block connector (4 contacts)
30 — Connector of the electronic control unit of the anti-theft system (4 contacts)
31 — Plug 150 (in the main wiring)
32 — Anti-theft alarm LED
33 — Trunk light plug
34 — Trunk light
35 — Front left door contact sensor
36 — Front right door contact sensor
37 — Rear left door contact sensor
38 — Rear right door contact sensor
39 — Trunk lid contact
40 — Hood contact
41 — Rear window defroster
42 — Plug - central section to on-board computer/anti-theft alarm wiring
43 — Horn
44 — LED plug
45 — Diode
46 — Plug - wire of anti-theft alarm to connecting wire of central locking
47 - Sound signal (to the left of the steering column)
48 — Sound signal connector
49 — Plug - central section to LE-Jetronic wiring
50 — Ignition switch
51 — Remote switch for on-board computer
52 — Plug - on-board computer to outside air temperature sensor wire
53 — Plug - wire of the outside air temperature sensor to the sensor itself
54 — Outside air temperature sensor (lower front panel)
55 — Plug - additional heater wire to automatic antenna
56 — Electronic control unit for parking heater (under the right seat)
57 — Electronic control unit connector
58 — Parking heater relay (on the heater)
59 — Plug - on-board computer wire to additional heater wire
60 — Plug - central section to the instrument panel
61 — Instrument cluster connector
62 — Electronic control unit of the on-board computer (right on the dashboard)
63 — On-board computer connector
64 — Instrument cluster connector 2
65 — Instrument cluster
66 — Plug - rear section to the instrument panel
67 — Plug - digital clock wire to instrument panel
68 — Plug - additional wire to heater wire
69 — Plug - heater wire to fuel pump wire
70 — Heater connector
71 — Additional resistance in the heater
72 — Thermal switch (parking heater)
73 — Heater motor
74 — Overheating sensor (parking heater)
75 — Heater plug to parking heater
76 — Heater
77 — Fuel pump
78 — Plug - on-board computer to remote control
79 - Plug - Volume control depending on speed
80 — Plug - wire of the speed control system
81 — Fuel Reserve Transmitter
82 - Speed transmitter
83 - Plug - digital clock wire to digital clock (4 contacts)
84 - Plug - digital clock wire to digital clock (2 contacts)
85 - Digital watch