Electrical diagram of the model «280TE» with engine 123.093, starting with chassis No. 007 619 (Mercedes-Benz E-Class W123)

Contents: Legend of the basic electrical…↡ Connection points with the "mass" ↡ Schematic diagram of electrical…↡ Schematic diagram of electrical…↡

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
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 amplifier*
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	Engine warm-up heating element
27	Fuel pump relay with electronic engine warm-up speed limiter
28	Air conditioning compressor electromagnetic clutch*
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
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	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 Conditioning Compressor Emergency Pressure Sensor* (switching on at 2.6 kgf/cm², switching off at 2.0 kgf/cm²)
45	Air Conditioner Relay II*
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	Throttle lift control system changeover valve
59	Thermoelectric switch (52°C) of the air conditioner dryer*
60	Thermoelectric switch (100°C)
61	Additional fan*
62	Additional fan relay*
63	Changeover valve for outside or recirculated air*
64	Air conditioner temperature sensor*
65	Air conditioner temperature selection switch*
66	Additional resistance of the fan motor
67	Fan motor
68	Additional resistance 0.6 Ohm
69	Left rear door window lift motor*
70	Left rear door window switch*
71	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
72	Left front door window lift motor*
73	Additional resistance 0.4 Ohm
74	Rear window heating time relay*
75	Rear window defroster switch*
76	Gear shift lever illumination*
77	Starter
78	Battery
79	Generator with electronic voltage regulator
80	Intermittent relay for rear window wiper
81	Rear door glass wiper motor
82	Fuel level indicator sensor
83	Fuel pump
84	Tail Light Wiring Harness Connector
85	Tailgate wiper motor lock switch or tailgate wiper intermittent switch
86	TDC sensor
87	Right front door window lift motor*
88	Diagnostic connector
89	Right rear door window switch*
90	Right rear door window lift motor*
91	Rear lamp with switch
92	Left rear light:
a	turn signal lamp
b	red/parking light lamp
with	brake light bulb
93	Rear fog light
94	Rear door glass washer pump
95	Rear courtesy light lock switch or rear window washer pump pushbutton switch
96	License plate light
97	Rear window heating element*
98	Ceiling light switch in left rear door pillar*
99	Ceiling light switch in the right rear door pillar*
100	Switch in the tailgate
101	Ground connection point for tailgate wiring
102	Reverse light lamp
103	Right rear light:
a	turn signal lamp
b	red/parking light lamp
with	brake light bulb

* Depending on the configuration.

Connection points with the "mass"

№	Designation
M1	main connection point with the "mass" (behind the instrument cluster)
M2	front-right connection point with the "mass" (near the headlight)
M3	ground connection point on the left front wheel mudguard (for ignition coil)
M4	ground connection point of the front interior light
M5	"mass" of the engine
M6	ground connection point in the luggage compartment on the left wing mudguard
M7	ground connection point in the luggage compartment on the right wing mudguard
M8	ground connection point on the tailgate