Fuses and relays Mercedes C-class (W203; 2000 - 2007) (2024)


Table of Contents

  • In the engine compartment
    • Fuse box
    • Power fusible links
  • In the passenger compartment
  • In the luggage compartment
  • All electrical equipment

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.

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

It is located on the left side of the underhood.

General view.

F43aHorn (beep)15
F45SRS electronic unit7.5
F46Windshield wiper motor relay40
F47Duffel box light bulb, front cigarette lighter fuse Mercedesw203 - C160, C180, C230, C240, C280, C320.15
F48Brake booster control unit (engine 112)15
F49SRS electronic unit7.5
F50Lighting control unit5
F51Air conditioning system, headlight corrector control unit, instrument panel, cooling fan motor7.5
F53Engine management system (gasoline), multifunction control unit 215
F54Engine management system, air conditioning system (gasoline)7.5
F55Steering wheel position sensor, sequential manual transmission - with manual transmission7.5
F56Stop lamp switch (brake pedal position sensor), Electronic Stability Program (ESP) unit5
F57Steering wheel position sensor, electronic engine control module (ECM) (engine 112), electronic ignition switch control module5
F58Gearbox (sequential manual transmission)40
F59ESP (Vehicle Stability Support)50
F61Gearbox (sequential manual transmission)15
F62Diagnostic connector (DLC), lighting control unit, brake light switch (brake pedal position sensor)5
F63Lighting control unit5
F64Audio system10
F65Exhaust air pump motor (if installed)40
IHorn (beep) relay
KTransmission (sequential manual transmission)
LWindshield wiper motor relay (1st and 2nd speed)
MIgnition circuit
NGearbox pump (sequential manual gearbox)
OExhaust air pump (112/113/271 engines)
PIgnition circuit
QWindshield wiper motor (ON / OFF)
REngine management system

Power fusible links

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

1Fuse box in the passenger compartment125
2SAM control unit, rear200
3Additional fuse box125
4SAM control unit, front200
5Electric suction fan for engine and air conditioning with integrated controller125
Diesel engines: Preheat output stage125
6SAM control unit, front60

In the passenger compartment

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

Access example.

F21left front door electrical system30
F22right front door electrical system30
F23Cigarette lighter fusemercedes w203 - C160, C180, C230, C240, C280, C320.15
F25Rear window heating10
F26Audio system output amplifier30
F27Front left power seat control unit30
F29Multifunctional control unit (taxi)30
F30Air conditioner / heater fan motor40
F31Ignition lock20
F32left rear door electrical system30
F33right rear door electrical system30
F35Additional heater30
F37Brake booster vacuum pump25
F38electric drive of the right front seat30
F40Multifunctional control unit (taxi)30
F41Air conditioning/heater, multifunction switch control unit (upper) - center console (^05/01)7.5
F42Instrument cluster7.5

In the luggage compartment

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 breakersA
F1electric drive of the left front seat30
F2electric seat drive, right front. electric seat drive relay (front)30
F3tire pressure monitoring system, interior lamp (rear)7.5
F4Fuel pump fuse Mercedesw203 (gasoline engines)20
F8Antenna signal amplifier, anti-theft system horn, vehicle tilt sensor (anti-theft system)7.5
F9electric sunroof25
F10Heated rear window40
F12Accessory power connector (rear cigarette lighter)15
F13Lumbar support adjustment pump, local light bulbs (rear), telephone5
F14Rear window wiper motor (station wagon)10
F15Relay 1 of the fuel filler flap lock actuator10
F17Trailer control unit20
F18Trailer electrical connector20
F19Lumbar support adjustment pump20
F20Rear window curtain relay7.5
No.Relay modules
AFuel pump relay
BIgnition circuit
Erear window heating
FIgnition circuit
GFuel 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.

Related fuse diagrams

Mercedes C-class (W202; 1993 - 2000)

Mercedes C-class (W204; 2007 - 2014)

Mercedes C-Class (W205, 2014 - 2021)

Mercedes-Benz Sprinter (W901 / W905; 1995 - 2011)

Mercedes-Benz S-class (W220, 1998 - 2005)

Mercedes A-Class (W168; 1997 - 2004)


ايمن العكري


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Fuses and relays Mercedes C-class (W203; 2000 - 2007) (2024)
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