Mercedes-Benz E-class W123 - Repair manual and operation

11:13. Schematic diagrams of electric equipment

The 250 models with the engine 123.026

Legend of the schematic electric circuit of electric equipment

№	Designation
1	Left block headlight:
and	thread of driving beam
b	thread of passing beam
with	lamp of dimensional/parking light
d	lamp of fog light
е	lamp of the index of turn
2	Sensor of a control lamp of level of brake fluid
3	Contact sensor of wear of overlays of the left forward brake
4	Lighting lamp of the coulisse of the lever of gear shifting *
5	Combination of devices:
and	control lamp of the left index of turn
b	control lamp of wear of brake slips
with	control lamp of level of brake fluid and turning on of the parking brake
d	control lamp of a reserve of fuel
е	index of level of fuel
f	index of temperature of cooling liquid
g	lighting lamps of devices
h	rheostat of lighting of devices
i	control lamp of the category of the rechargeable battery
j	control lamp of driving beam of headlights
k	control lamp of the right index of turn
l	electronic clock
6	The lighter with the ashtray lighting lamp
7	Radio receiver *
8	Right block headlight:
and	thread of driving beam
b	thread of passing beam
with	lamp of dimensional/parking light
d	lamp of fog light
е	lamp of the index of turn
9	Spiral of heating of the automatic air gate
10	Electromagnetic locking valve of fuel of idling II
11	Automatic antenna *
12	Switch of a control lamp of the parking brake
13	Sensor of temperature of cooling liquid
14	Contact sensor of wear of overlays of the right forward brake
15	Forward plafond with the switch
16	The plafond switch in a rack of the left door
17	The plafond switch in a rack of the right door
18	Sound signal
19	Sensor of the program regulator of speed of the movement *
20	Amplifier of the program regulator of speed of the movement *
21	Executive drive of a butterfly valve *
22	Switch / реле-прерыватель 4-sided alarm system
23	Switch of a plafond of illumination of a ware box
24	Plafond of illumination of a ware box
25	Block of fuses
26	Electromagnetic locking valve of fuel of idling of I
27	Relay I of inclusion of window regulators *
28	Relay II of inclusion of window regulators *
29	Door switch of a window regulator *
30	Switch of a sound signal
31	The combined understeering switch:
and	switch of indexes of turn
b	alarm system switch light of headlights
with	switch of light of headlights
d	windshield washer switch
е	switch of speed of screenwash
I	faltering work
II	small speed
III	high speed
32	Switch of the program regulator of speed of the movement:
And	it is switched off
V	delay/control
SP	return on the former speed of the movement
In	dispersal/control
33	Electric motor of screenwash
34	Relay of a faltering operating mode of screenwash
35	Ignition switch
36	Rotary switch of lighting
37	The hatch electric motor in a roof *
38	The hatch switch in a roof with the electric drive *
39	Electromagnetic valve of automatic transmission *
40	Switch of foot inclusion of the lowest transfer *
41	Switch of blocking of a starter and light of a backing *
42	Conditioner II relay *
43	Conditioner I relay *
44	The fan switch with lighting
45	Switch of stoplights
46	Windshield washer pump
47	Electric motor of a cleaner of a left headlight *
48	Electric motor of a cleaner of a right headlight *
49	Relay of cleaners of headlights *
50	Pump of washers of headlights *
51	Ignition distributor *
52	Spark plugs
53	Ignition coil
54	Lighting:
and	handles of the direction of a stream of air
b	handles of management of a heater
with	switch *
55	Thermoelectric switch (62 °C) of a conditioner dehumidifier *
56	Thermoelectric switch (100 °C)
57	Electric motor of a window regulator of the left back door *
58	Switch of a window regulator of the left back door *
59	Block of switches стеклоподъемников*:
and	switch of a window regulator of the left back door *
b	safety switch
with	switch of a window regulator of the left forward door
d	switch of a window regulator of the right forward door
е	switch of a window regulator of the right back door
60	Fan electric motor
61	Additional resistance of the electric motor of the fan
62	The switch of the choice of air temperature of air conditioning system with lighting *
63a	Electromagnetic coupling of turning on of the compressor of the conditioner *
63b	The sensor of emergency pressure of the compressor of the conditioner * (inclusion at 2,6 kgfs/cm 2, switching off at 2,0 kgfs/cm 2)
64	Additional fan *
65	Relay of the additional fan *
66	Switch of heating of back glass
67	Timer of heating of back glass
68	Additional resistance of 1,8 Ohms
69	Electric motor of a window regulator of the left forward door *
70	Electric motor of a window regulator of the right forward door *
71	Diagnostics block
72	VMT sensor
73	Lighting lamp of the luggage compartment
74	I will corrode conductings to consumers of a back part of the car
75	Switch of a window regulator of the right back door *
76	Electric motor of a window regulator of the right back door *
77	Sensor of the index of level of fuel
78	Back plafond of illumination of salon
79	The plafond switch in a rack of the left back door *
80	Switch of a back plafond of illumination of salon *
81	The plafond switch in a rack of the right back door *
82	The generator with the electronic regulator of tension
83	Rechargeable battery
84	Starter
85	Right back lamp:
and	lamp of the index of turn
b	lamp of red/parking light
with	backing light lamp
d	stoplight lamp
86	Element of heating of back glass *
87	Lighting lamp of registration plate
88	Left back lamp:
and	lamp of the index of turn
b	lamp of red/parking light
with	backing light lamp
d	stoplight lamp
е	lamp of fog light

* Depending on a complete set.

Designation of color of wires

Designation	Interpretation
bl	blue
br	brown
el	colors of ivory
ge	yellow
gn	green
gr	gray
nf	colourless
rs	pink
rt	red
sw	black
vi	violet
ws	white

The first two letters designate color of a wire, the second two letters color of a strip on a wire. Figures near designation of a coloring of a wire specify its section in mm ².

Schematic electric circuit of electric equipment (1)

Schematic electric circuit of electric equipment (2)