The second generation of the Mercedes-Benz C-Class was introduced in 2000 and produced in three body styles: sedan, station wagon (estate), and coupe. The sedan, which served as the foundation for this generation's C-Class lineup, distinguished itself from its predecessor with a sportier design and dynamic silhouette. In this article, we provide detailed fuse box diagrams and terminal assignments for the Mercedes-Benz C-Class W203 (C160, C180, C230, C240, C280, C320) produced from 2000 through 2007 model years.
Below you will find the locations, diagrams, and descriptions of the power distribution boxes. Fuses for the “Cigarette Lighter” and “Fuel Pump” are highlighted in bold.
Engine Compartment
The engine compartment houses two fuse and relay boxes responsible for circuit protection.
Engine Compartment Fuse Box
Located on the left side of the engine compartment.
General overview.
| Diagram | ||
|---|---|---|
|
||
| No. | Description | A |
| F43a | Horn | 15 |
| F43b | 15 | |
| F44 | Cellular phone system | 5 |
| F45 | SRS control unit | 7.5 |
| F46 | Windshield wiper motor relay | 40 |
| F47 | Glove compartment light, front cigarette lighter fuse – Mercedes W203 (C160, C180, C230, C240, C280, C320) | 15 |
| F48 | Brake booster control module (M112 engine) | 15 |
| F49 | SRS control unit | 7.5 |
| F50 | Lighting control module | 5 |
| F51 | Climate control system, headlight range adjustment unit, instrument cluster, engine cooling fan motor | 7.5 |
| F52 | Starter motor | 15 |
| F53 | Engine control module (gasoline), front SAM control unit | 15 |
| F54 | Engine control module, climate control system (gasoline) | 7.5 |
| F55 | Steering angle sensor, automated manual transmission (Sequentronic) | 7.5 |
| F56 | Brake light switch (brake pedal position sensor), Electronic Stability Program (ESP) control unit | 5 |
| F57 | Steering angle sensor, Engine Control Module (ECM) (M112 engine), Electronic Ignition Switch (EIS) control unit | 5 |
| F58 | Automated manual transmission (Sequentronic) | 40 |
| F59 | Electronic Stability Program (ESP) | 50 |
| F60 | 40 | |
| F61 | Automated manual transmission (Sequentronic) | 15 |
| F62 | Diagnostic link connector (DLC), lighting control module, brake light switch | 5 |
| F63 | Lighting control module | 5 |
| F64 | Audio system | 10 |
| F65 | Secondary air injection pump motor (if equipped) | 40 |
| No. | Relay | |
| I | Horn relay | |
| K | Automated manual transmission relay | |
| L | Windshield wiper motor relay (speeds 1 and 2) | |
| M | Terminal 15 / Ignition circuit relay | |
| N | Automated manual transmission hydraulic pump relay | |
| O | Secondary air injection pump relay (M112/M113/M271 engines) | |
| P | Terminal 15 / Ignition circuit relay | |
| Q | Windshield wiper ON/OFF relay | |
| R | Engine management system relay | |
| S | Starter relay | |
Main Prefuse Box
A high-current main prefuse panel is located adjacent to the battery.
| Diagram | ||
|---|---|---|
|
||
| No. | Description | A |
| 1 | Cockpit / Instrument panel fuse box | 125 |
| 2 | Rear SAM control unit | 200 |
| 3 | Auxiliary fuse box | 125 |
| 4 | Front SAM control unit | 200 |
| 5 | Engine cooling fan with integrated controller | 125 |
| Diesel engines: Glow plug control unit | 125 | |
| 6 | Front SAM control unit | 60 |
Passenger Compartment
The cockpit fuse box is located on the driver's side end of the instrument panel, behind a removable cover panel.
Access overview.
| Diagram | ||
|---|---|---|
|
||
| No. | Description | A |
| F21 | Front left door control module / door electrical system | 30 |
| F22 | Front right door control module / door electrical system | 30 |
| F23 | Cigarette lighter fuse – Mercedes W203 (C160, C180, C230, C240, C280, C320) | 15 |
| F24 | - | |
| F25 | Heated rear window | 10 |
| F26 | Audio system amplifier | 30 |
| F27 | Front left power seat control module | 30 |
| F28 | - | |
| F29 | Special vehicle / Taxi multifunction control module | 30 |
| F30 | Blower motor (heating / climate control) | 40 |
| F31 | Electronic Ignition Switch (EIS) | 20 |
| F32 | Rear left door control module / door electrical system | 30 |
| F33 | Rear right door control module / door electrical system | 30 |
| F34 | Cellular phone system | 7.5 |
| F35 | Auxiliary heater | 30 |
| F36 | - | |
| F37 | Brake booster vacuum pump | 25 |
| F38 | Front right power seat drive | 30 |
| F39 | - | |
| F40 | Special vehicle / Taxi multifunction control module | 30 |
| F41 | Climate control panel, upper center console multifunction switch block (up to 05/01) | 7.5 |
| F42 | Instrument cluster | 7.5 |
Luggage Compartment (Trunk)
The fuse box is located behind the trim panel on the left side of the trunk/luggage compartment.
General view of the Mercedes-Benz C-Class W203 trunk fuse box.
| Diagram | ||
|---|---|---|
|
||
| No. | Description | A |
| F1 | Front left power seat drive | 30 |
| F2 | Front right power seat drive, front power seat relay | 30 |
| F3 | Tire Pressure Monitoring System (TPMS), rear interior light | 7.5 |
| F4 | Fuel pump fuse – Mercedes W203 (gasoline engines) | 20 |
| F5 | - | |
| F6 | - | |
| F7 | - | |
| F8 | Antenna amplifier, anti-theft alarm siren, vehicle tow-away / tilt sensor | 7.5 |
| F9 | Power sunroof | 25 |
| F10 | Heated rear window | 40 |
| F11 | - | |
| F12 | Auxiliary power socket (rear cigarette lighter) | 15 |
| F13 | Lumbar support pump, rear reading lights, telephone | 5 |
| F14 | Rear window wiper motor (Estate / Wagon models) | 10 |
| F15 | Fuel filler flap locking actuator relay 1 | 10 |
| F16 | Cellular phone system | 20 |
| F17 | Trailer recognition control module | 20 |
| F18 | Trailer socket / electrical connector | 20 |
| F19 | Lumbar support pump | 20 |
| F20 | Rear window roller blind relay | 7.5 |
| No. | Relays | |
| A | Fuel pump relay | |
| B | Terminal 15 / Ignition circuit relay | |
| C | - | |
| D | - | |
| E | Heated rear window relay | |
| F | Terminal 15 / Ignition circuit relay | |
| G | Fuel filler flap locking actuators 1 and 2 | |
| H | ||
Electrical Component Location Overview
General component layout of the electrical system in the Mercedes-Benz W203:
1. Climate control panel / HVAC control module – center console;
2. Blower motor regulator – adjacent to the blower motor;
3. Air quality / dew point sensor;
4. Sun sensor (climate control);
5. Antenna amplifier 1 – top of rear window;
7. Anti-theft alarm control module (integrated into rear SAM) – left side of trunk;
8. Tow-away / tilt sensor – left side of trunk;
9. Anti-theft alarm siren – behind front wheel arch liner;
10. Interior motion / intrusion sensors;
11. Audio / COMAND head unit;
12. Sound system amplifier (if equipped) – right side of trunk;
13. Auxiliary heater control module;
14. Auxiliary heater remote control receiver – behind rear trunk panel;
15. Battery;
16. Vacuum pump control module (brake booster);
17. Infrared receiver (central locking) – driver's door handle;
18. Diagnostic link connector (DLC / OBD-II);
19. Driver door control module;
20. Left rear door control module;
21. Front passenger door control module;
22. Right rear door control module;
23. Engine compartment fuse and relay box (Front SAM);
24. Cockpit / Instrument panel fuse box;
25. Trunk fuse and relay box (Rear SAM);
26. Left headlamp control module (xenon models);
27. Right headlamp control module (xenon models);
28. Dual horns – behind front grille;
29. Electronic Ignition Switch (EIS) control module;
30. Immobilizer control unit (integrated into EIS module);
31. Turn signal / hazard flasher relay – in rear SAM module;
32. Rotary light switch module – behind main headlight switch;
34. Front SAM unit (Multifunction control module 1) – attached to engine compartment fuse box. Functions: Exterior lighting, horns, windshield wipers, AC refrigerant pressure sensor, headlight washers, coolant/brake fluid level sensors, ambient temperature sensor, power mirrors;
35. Rear SAM unit (Multifunction control module 2) – attached to trunk fuse box. Functions: Central locking, fuel level sensor, anti-theft alarm, hazard lights, heated rear window, taillights, trunk remote release, rear window wiper (Estate/Wagon);
36. Navigation system control module;
37. Ambient air temperature sensor;
38. Parktronic (PTS) control module – behind rear trunk panel;
39. Rain/light sensor – upper center of windshield;
40. Driver seat memory control module – beneath left front seat;
41. Passenger seat memory control module – beneath right front seat;
42. Heated seat control module – integrated into upper center console switch block;
43. Transmission control module (TCM) – Sequentronic automated manual transmission;
44. Left side impact sensor – beneath rear seat;
45. Right side impact sensor – beneath rear seat;
46. Supplemental Restraint System (SRS) control module;
47. Steering column module (N80) – behind steering wheel;
48. Electronic steering column lock (ESL) – integrated into EIS module;
49. Power sunroof control module;
50. Front axle level sensor (xenon headlamps) – attached to front anti-roll bar;
51. Rear axle level sensor (xenon headlamps) – attached to rear axle;
52. Cellular network module – behind rear trunk panel;
53. Telephone interface module – behind rear trunk panel;
54. Telephone transceiver – behind rear trunk panel;
55. Trailer recognition control module – behind rear trunk panel;
56. Automatic transmission control module (TCM);
57. Electronic selector lever module (ESM) – automatic transmission shifter;
59. Voice control system (LINGUATRONIC) module – behind rear trunk panel;
60. Auxiliary fuse box 2 – engine compartment.
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