Fuses and relays Mercedes C-class (W203; 2000 - 2007)

The second generation of Mercedes C-Class (W203) appeared in 2000 and was produced in three bodies: sedan, station wagon and coupe. Sedan, which served as a basis for the C-Class family in this generation differs from its predecessor by a sporty design with dynamic silhouette. In this article we will understand in detail fuse box diagrams Mercedes C-Class W203 (2nd generation; C160, C180, C230, C240, C280, C320) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 years of manufacture.

Photo of mercedes w203
Here you will find the locations and photos of the mounting blocks. Also, we will separately mark the fuses responsible for the cigarette lighter and the fuel pump.

In the engine compartment

Here there are two units responsible for the protection of the vehicle's electrical circuits.

Fuse box

The location of the fuse box in the engine compartment of the car
It is located on the left side of the underhood.

Photo of fuse box under the hood W203
General view.

No. Decoding A
F43a Horn (beep) 15
F43b 15
F44 Telephone 5
F45 SRS electronic unit 7.5
F46 Windshield wiper motor relay 40
F47 Duffel box light bulb, front cigarette lighter fuse Mercedes w203 - C160, C180, C230, C240, C280, C320. 15
F48 Brake booster control unit (engine 112) 15
F49 SRS electronic unit 7.5
F50 Lighting control unit 5
F51 Air conditioning system, headlight corrector control unit, instrument panel, cooling fan motor 7.5
F52 Starter 15
F53 Engine management system (gasoline), multifunction control unit 2 15
F54 Engine management system, air conditioning system (gasoline) 7.5
F55 Steering wheel position sensor, sequential manual transmission - with manual transmission 7.5
F56 Stop lamp switch (brake pedal position sensor), Electronic Stability Program (ESP) unit 5
F57 Steering wheel position sensor, electronic engine control module (ECM) (engine 112), electronic ignition switch control module 5
F58 Gearbox (sequential manual transmission) 40
F59 ESP (Vehicle Stability Support) 50
F60 40
F61 Gearbox (sequential manual transmission) 15
F62 Diagnostic connector (DLC), lighting control unit, brake light switch (brake pedal position sensor) 5
F63 Lighting control unit 5
F64 Audio system 10
F65 Exhaust air pump motor (if installed) 40
No. Relay
I Horn (beep) relay
K Transmission (sequential manual transmission)
L Windshield wiper motor relay (1st and 2nd speed)
M Ignition circuit
N Gearbox pump (sequential manual gearbox)
O Exhaust air pump (112/113/271 engines)
P Ignition circuit
Q Windshield wiper motor (ON / OFF)
R Engine management system
S Starter

Power fusible links

Next to the battery there is a panel consisting of power fuses.

No. Description A
1 Fuse box in the passenger compartment 125
2 SAM control unit, rear 200
3 Additional fuse box 125
4 SAM control unit, front 200
5 Electric suction fan for engine and air conditioning with integrated controller 125
Diesel engines: Preheat output stage 125
6 SAM control unit, front 60

In the passenger compartment

The location of the fuse box in the passenger compartment
The fuse box is located in the left end of the instrument panel behind the plastic cover.

Access example.

No. Description A
F21 left front door electrical system 30
F22 right front door electrical system 30
F23 Cigarette lighter fuse mercedes w203 - C160, C180, C230, C240, C280, C320. 15
F24 -  
F25 Rear window heating 10
F26 Audio system output amplifier 30
F27 Front left power seat control unit 30
F28 -  
F29 Multifunctional control unit (taxi) 30
F30 Air conditioner / heater fan motor 40
F31 Ignition lock 20
F32 left rear door electrical system 30
F33 right rear door electrical system 30
F34 Telephone 7.5
F35 Additional heater 30
F36 -  
F37 Brake booster vacuum pump 25
F38 electric drive of the right front seat 30
F39 -  
F40 Multifunctional control unit (taxi) 30
F41 Air conditioning/heater, multifunction switch control unit (upper) - center console (^05/01) 7.5
F42 Instrument cluster 7.5

In the luggage compartment

Location of the fuse box in the luggage compartment of the car
The unit is located on the left side of the luggage compartment. 

General view of the Mercedes C-class W203 trunk fuse box.

No. Circuit breakers A
F1 electric drive of the left front seat 30
F2 electric seat drive, right front. electric seat drive relay (front) 30
F3 tire pressure monitoring system, interior lamp (rear) 7.5
F4 Fuel pump fuse Mercedes w203 (gasoline engines) 20
F5 -  
F6 -  
F7 -  
F8 Antenna signal amplifier, anti-theft system horn, vehicle tilt sensor (anti-theft system) 7.5
F9 electric sunroof 25
F10 Heated rear window 40
F11 -  
F12 Accessory power connector (rear cigarette lighter) 15
F13 Lumbar support adjustment pump, local light bulbs (rear), telephone 5
F14 Rear window wiper motor (station wagon) 10
F15 Relay 1 of the fuel filler flap lock actuator 10
F16 Telephone 20
F17 Trailer control unit 20
F18 Trailer electrical connector 20
F19 Lumbar support adjustment pump 20
F20 Rear window curtain relay 7.5
No. Relay modules
A Fuel pump relay
B Ignition circuit
C -  
D -  
E rear window heating
F Ignition circuit
G Fuel filler neck lock actuators 1 and 2

All electrical equipment

General layout of the electrical system in Mercedes W203.
1. Air conditioner/heater control module - in the heater control panel;
2. Air conditioner/heater fan control module - next to the fan motor;
3. Clean air sensor (air conditioning system);
4. Sunlight sensor (air conditioning system);
5. Antenna signal amplifier - 1, top of rear window;
7. Anti-theft system control module (integrated with the multifunction control unit) - left side of the luggage compartment;
8. Vehicle tilt sensor (anti-theft system) - left-hand side of the luggage compartment;
9. Anti-theft alarm system buzzer - behind the wheel arch lining;
10. Volume change sensors (anti-theft system);
11. Audio system module - in the navigation system;
12. Audio system output amplifier (if fitted) - right-hand side of the luggage compartment;
13. Auxiliary heater control unit;
14. Receiver for remote control of the auxiliary heater - under the panel (rear part of the luggage compartment);
16. Brake booster vacuum pump control unit;
17. Central locking signal sensor (infrared) - in the driver's door handle;
18. Diagnostic connector (DLC);
19. Driver's door electrical control module;
20. Left rear door electrical control module;
21. Passenger door electrical control module;
22. Right rear door electrical control module;
23. Fuse/relay box, engine compartment 1;
24. Fuse box in the passenger compartment;
25. Fuse/relay box, luggage compartment;
26. Headlamp control module, left (xenon headlamp models);
27. Headlamp control module, right (xenon headlamp models);
28. Horns 1/2- behind the grille;
29. Ignition switch control module;
30. Electronic immobilizer control module - (combined with ignition switch control module);
31. Turn signal/emergency signaling relay - in multifunction control module 2;
32. Lighting control module - behind the headlight switch;
34. Multifunction control unit 1 - attached to the fuse/relay box in the engine compartment - functions: Interior lamps, head lights, horns, windshield wipers, air conditioning pressure control, headlight washers, coolant level, brake fluid level, thermometer, power door mirrors;
35. Multifunction control unit 2 - connected by fuse/relay box, luggage compartment-Functions: Central locking, fuel level, anti-theft system, emergency alarm, rear window heater, tail lights, trunk lid opening actuator, rear window wiper (station wagon);
36 Navigation system control module;
37. Ambient air temperature sensor;
38. Parking system control module under the panel in the rear luggage compartment;
39. Rain sensor - upper center section of the windshield;
40. Power seat control module (with memory), front left seat - under the seat;
41. Control module for the power seat (with memory), front right - under the seat;
42. Control module for seat heating, front. - in the switch unit;
43. Electronic control module for the transmission - sequential automatic transmission;
44. Side impact sensor, left - under the rear seat;
45. Side impact sensor, right - under the rear seat;
46 SRS electronic control unit;
47. Steering column electrical control module - behind the steering wheel;
48. Steering column lock control module - integrated in the ignition switch control unit;
49. Electric sunroof control module;
50. Body height sensor, front (models with xenon headlamps) - front stabilizer bar;
51. Body height sensor, rear (xenon headlamp models) - rear axle;
52. Telephone network connection module - under the panel at the rear of the luggage compartment;
53. Telephone interface control module - under the panel, at the rear of the luggage compartment;
54. Telephone transceiver - under the panel, at the rear of the luggage compartment;
55. Trailer electrical control module - under the panel, in the rear part of the luggage compartment;
56. Transmission control unit;
57. Gearshift control module - automatic transmission selector lever;
59. Voice activation system module - under the panel, in the rear part of the luggage compartment;
60. Fuse box, engine compartment 2.

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ايمن العكري


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