Electrical diagram of the model «280TE» with engine 123.093 (Mercedes-Benz E-Class W123)

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Legend of the basic electrical circuit diagram of electrical equipment

№	Designation
1	Left headlight:
a	high beam thread
b	low beam thread
with	side/parking light lamp
d	fog light lamp
e	turn signal lamp
2	Brake Fluid Level Warning Light Sensor
3	Left front brake lining wear sensor
4	Right front brake lining wear sensor
5	Instrument cluster:
a	left turn signal indicator light
b	high beam indicator lamp
with	coolant temperature gauge
d	fuel gauge
e	fuel reserve indicator light
f	low battery indicator light
g	brake lining wear indicator light
h	brake fluid level and parking brake warning light
i	instrument lighting lamps
j	instrument lighting rheostat
k	emergency sound signaling device
l	right turn signal indicator lamp
m	electronic clock
6	Cigarette lighter with ashtray lamp
7	Radio*
8	Right headlight:
a	high beam thread
b	low beam thread
with	side/parking light lamp
d	fog light lamp
e	turn signal lamp
9	Fuel injection start mode switch
10	Starting fuel valve
11	Automatic antenna*
12	Parking brake indicator light switch
13	Coolant Temperature Gauge Sensor
14	Contact for switching on the emergency sound signaling device
15	Front ceiling light with switch
16	Ceiling light switch in the left front door pillar
17	Ceiling light switch in the right front door pillar
18	Two-tone sound signal (fanfare)
19	Speed controller sensor*
20	Speed controller control unit*
21	Actuator of the software speed controller*
22	Electronic alarm switch/relay
23	Glove compartment light switch
24	Glove compartment light
25	Fuse box
26	Heating element of the engine warm-up control system
27	Fuel pump relay of the engine warm-up control system
28	Torque Converter Threshold Safety Switch
29	Relay I for switching on window lifters*
30	Relay II for switching on window lifters*
31	Door window switch*
32	Speed control software switch*:
A	off
V	slowdown/tuning
SP	return to previous speed of movement
IN	overclocking/tuning
33	Combined steering column switch:
a	turn signal switch
b	headlight signal switch
with	headlight switch
d	windshield washer switch
e	windshield wiper speed switch
I	intermittent operation
II	low speed
III	high speed
34	Horn switch
35	Windshield wiper motor
36	Windscreen wiper intermittent relay
37	Ignition switch
38	Rotary light switch
39	Sunroof Electric Motor*
40	Electric sunroof switch*
41	Automatic Transmission Solenoid Valve*
42	Foot switch for low gear engagement*
43	Starter interlock and reversing light switch*
44	Air Conditioner Relay II*
45	Air Conditioner Relay I*
46	Fan switch with light
47	Brake light switch
48	Windshield washer pump
49	Left headlight wiper motor*
50	Right headlight wiper motor*
51	Headlight Washer Relay*
52	Headlight washer pump*
53	Transistor ignition switch
54	Contactless ignition distributor
55	Spark plugs
56	Ignition coil
57	Lighting:
a	air flow direction knobs
b	heater control knobs
with	switch
58	Idle Speed Control System Switching Valve*
59	Thermoelectric switch (62°C) of the air conditioner dryer*
60	Thermoelectric switch (100°C)
61	Additional fan*
62	Additional fan relay*
63a	Air conditioning compressor electromagnetic clutch*
63b	Air Conditioning Compressor Emergency Pressure Sensor* (switching on at 2.6 kgf/cm², switching off at 2.0 kgf/cm²)
64	Air conditioner temperature selection switch*
65	Additional resistance of the fan motor
66	Fan motor
67	Additional resistance 0.6 Ohm
68	Left rear door window lift motor*
69	Left rear door window switch*
70	Power window switch block*:
a	left rear door window switch*
b	safety switch
with	left front door window switch
d	right front door window switch
e	right rear door window switch
71	Left front door window lift motor*
72	Additional resistance 0.4 Ohm
73	Rear window heating time relay*
74	Rear window defroster switch*
75	Ceiling light switch in the right rear door pillar*
76	Ceiling light switch in left rear door pillar*
77	Starter
78	Battery
79	Generator with electronic voltage regulator
80	Rear door glass wiper motor
81	Fuel level indicator sensor
82	Fuel pump
83	Tail Light Wiring Harness Connector
84	Rear courtesy light switch with lock
85	TDC sensor
86	Right front door window lift motor*
87	Diagnostic connector
88	Right rear door window switch*
89	Right rear door window lift motor*
90	Rear lamp
91	Left rear light:
a	turn signal lamp
b	red/parking light lamp
with	brake light bulb
92	Rear fog light
93	Rear door glass washer pump
94	Tailgate Window Washer Motor Switch with Lock
95	License plate light
96	Tailgate Switch/Tailgate Lock
97	Rear window heating element*
98	Gear Shift Lever Illumination Lamp
99	Ground connection point for tailgate wiring
100	Reverse light lamp
101	Right rear light:
a	turn signal lamp
b	red/parking light lamp
with	brake light bulb