The Mercedes-Benz W210 is the second generation of the German automaker’s executive E-Class model line. Replacing the W124 platform, it was produced from 1995 to 2003, with sedan bodies available through 2002 and station wagons (S210) through 2003. This technical reference provides fuse and relay box diagrams, component locations, and circuit assignment tables for Mercedes-Benz W210 / S210 (E-Class) models across all model years (1995–2003).
Below are the component locations and layout diagrams for all electrical power distribution boxes. Fuses associated with the “cigarette lighter / 12V accessory socket” circuit are highlighted in bold.
In the Engine Compartment
Located on the left (driver’s) side of the engine bay beneath a protective housing cover. This main distribution assembly is divided into Fuse Panel #1 and Fuse Panel #2.
Fuse Panel #1
General view.
| Diagram | ||
|---|---|---|
|
||
| No. | Circuit / Protected Component | Rating (A) |
| F1 | Cigarette lighter (switched via ignition), ashtray illumination (through 05/99) | 15 |
| F2 | Cigarette lighter (switched via ignition), ashtray illumination (from 06/99) | 15 |
| F3 | Combination steering column switch (low beam, high beam, windshield wiper/washer, rear window washer), glove compartment illumination lamp | 15 |
| F4 | HVAC system, instrument cluster clock, headlight reminder buzzer, steering angle sensor (from 06/99) | 10 |
| F5 | Anti-theft alarm system (with trailer hitch) (through 02/97) | 15 |
| F6 | Cigarette lighter (constant 12V / unswitched battery power) (through 05/99) | 15 |
| F7 | Instrument cluster, HVAC control module, engine compartment relay block | 15 20 |
| F8 | HVAC / automatic climate control module (through 02/97) | 7.5 |
| F9 | Electronic steering column lock (ESL) (through 03/97) | 15 |
| F10 | Rear window wiper / washer system (through 02/97) | 7.5 |
| F11 | Audio / navigation head unit, rear passenger compartment lighting, power seat adjustment (from 03/97), luggage compartment 12V auxiliary power socket (Wagon models) | 15 |
| F12 | Rear window wiper (select models), heated seats, front comfort seat belt pretensioners, rear window power roller blind | 10 |
| F13 | Audio / navigation head unit, Supplemental Restraint System (SRS), crash sensor control unit | 10 |
| F14 | Infrared (IR) central locking receiver, multi-function control module, Parktronic System (PTS) (through 02/97) | 7.5 |
| F15 | Electronic transmission control (ETC) module, variable camshaft timing (VCT) actuator (M111 engine), diagnostic link connector (DLC), evaporative emission control (EVAP) purge valve, glow plug control unit (Diesel), headlight range adjustment (through 02/97) | 15 |
| F16 | Power exterior mirrors, auto-dimming interior rearview mirror, heated windshield washer nozzles (through 02/97) | 15 |
| F17 | Infrared (IR) remote receiver, central locking system, steering angle sensor (through 02/97) | 10 |
| F18 | Rear left door control module (power window regulator motor, door exit/curtesy lamp) (from 03/97) | 20 |
| F19 | Cruise control (Tempomat), ignition coils, engine oil cooler fan (select models) | 10 15 |
| F20 | Engine cooling fan motor (select models) | 30 50 |
| F22 | Multi-function control module (select models) | 30 |
| F23 | Rain sensor, cellular telephone interface | 7.5 |
| F24 | Unassigned | |
| F25 | Auxiliary coolant heater (stationary heater) | 20 |
| F26 | Unassigned | |
Fuse Panel #2
General view.
| Diagram | ||
|---|---|---|
|
||
| No. | Circuit / Protected Component | Rating (A) |
| F39 | Engine oil cooler auxiliary fan motor | 30 |
| F40 | Dual-tone horn | 10 |
| F41 | Multi-function control module | 15 |
| F42 | Heated windshield washer nozzles and hose heater | 7.5 |
| F43 | Windshield washer pump | 7.5 10 |
| F44 | Windshield wiper motor | 40 |
| F45 | Headlight washer pump | 30 |
| No. | Relay Function | |
| 1 | ABS hydraulic pump motor relay | |
| 2 | Windshield wiper motor relay (Stage 1 / 2) | |
| 3 | Engine oil cooler fan relay | |
| 4 | Headlight washer high-pressure pump relay | |
| 5 | Windshield wiper motor relay (On / Off) | |
| 6 | Windshield washer pump relay | |
| 7 | Horn relay | |
In the Passenger Compartment
The interior electrical system is protected by two separate fuse and relay distribution blocks.
Fuse Box #1 (Dashboard End Panel)
Located behind the access panel on the left end of the instrument panel (accessible when the driver’s door is open). These fuses primarily protect exterior lighting circuits. To release the access cover, turn the 3 quarter-turn locking fasteners.
General view of the Mercedes-Benz W210 / S210 lateral dashboard fuse panel.
| Diagram | ||
|---|---|---|
|
||
| No. | Circuit / Protected Component | Rating (A) |
| 1 | Unassigned | |
| 2 | Brake lamps, cruise control (Tempomat) disengage signal | 15 |
| 3 | Right high beam, high beam indicator lamp | 7.5 |
| 4 | Reversing lamps, hazard warning flasher switch, rear window wiper, auto-dimming rearview mirror | 15 |
| 5 | Left high beam | 7.5 |
| 6 | Right low beam | 15 |
| 7 | Right parking / standing lamp, right tail lamp | 7.5 |
| 8 | Left low beam | 15 |
| 9 | Front fog lamps | 15 |
| 10 | Left parking / standing lamp, left tail lamp | 7.5 |
| 11 | License plate lamps, instrument cluster backlighting | 7.5 |
| 12 | Rear fog lamp | 7.5 |
Fuse Box #2 (Under Rear Seat)
The second interior distribution block is located beneath the right rear passenger seat cushion, directly adjacent to the main 12V starter battery.
General view.
| Diagram | ||
|---|---|---|
|
||
| No. | Circuit / Protected Component | Rating (A) |
| 1 | Rear left power window regulator (via central control unit) | 30 |
| 2 | Rear right power window regulator (via central control unit) | 30 |
| 3 | Interior lighting system (via central control unit) | 15 |
| 4 | Power tilting/sliding sunroof | 25 |
| 5 | Pneumatic central locking system (PSE pump), horn, audio head unit, CD changer | 25 |
| 6 | Rear door lock actuators / child safety locks | 20 |
| 7 | Memory function module for steering column and power mirror adjustment | 30 |
| 8 | Front left power seat adjustment control module | 25 |
| 9 | Front right power seat adjustment control module | 25 |
| 10 | Center console refrigerated compartment, interior motion sensor / volumetric alarm | 10 |
| 11 | Brake Assist System (BAS) sensor target, mobile video recorder, audio amplifier | 10 |
| 12 | Trailer towing package socket / module | 25 |
| 13 | Front right power seat adjustment | 25 |
| 14 | Front right power seat adjustment | 25 |
| 15 | Brake Assist System (BAS) control unit, cellular telephone | 7.5 |
| 16 | Brake Assist System (BAS), premium acoustic sound system amplifier (Bose) | 25 |
| 17 | Unassigned | |
| 18 | Front seat heating control module | 20 |
| 19 | Heated rear windshield (defroster), anti-theft alarm system siren | 40 |
| 20 | Unassigned | |
| R1 | Relay slot (unassigned) | |
| R2 | Relay slot (unassigned) | |
| R3 | Relay slot (unassigned) | |
Electrical Component Locations
General electrical and electronic component layout on the Mercedes-Benz W210 platform.
1. Automatic climate control (A/C) control module – integrated into the dashboard heater control panel;
2. Antenna amplifier module – mounted beneath the rear parcel shelf;
3. Pneumatic System Equipment (PSE) / central locking control module with integrated anti-theft alarm pump – beneath the rear seat cushion;
4. Vehicle tow-away / inclination tilt sensor (anti-theft alarm) – beneath the rear seat cushion;
5. Anti-theft alarm system warning buzzer (1997);
6. Anti-theft alarm system siren / horn (from 1998) – mounted behind the front wheel arch liner;
7. Interior volumetric motion sensor (anti-theft alarm), left side (select models) – B-pillar;
8. Interior volumetric motion sensor (anti-theft alarm), right side (select models) – B-pillar;
9. Interior volumetric motion sensors (anti-theft alarm) (select models);
10. Premium audio amplifier (Bose);
11. Auxiliary coolant heater (stationary heater) control unit;
12. 12V vehicle battery – installed beneath the rear seat cushion;
13. Central locking control unit (Infrared);
14. Infrared (IR) central locking receiver – integrated into the interior rearview mirror;
15. Tele Aid emergency call system control module – left side of luggage compartment;
16. Diagnostic Link Connector 1 (DLC, 38-pin underhood diagnostic port);
17. OBD-II Diagnostic Link Connector 2 (DLC, 16-pin) (from 2001);
18. Driver front door control module (DCM) (from 03/97);
19. Driver rear door control module (DCM) (from 03/97);
20. Passenger front door control module (DCM) (from 03/97);
21. Passenger rear door control module (DCM) (from 03/97);
22. Power window switch group / control module – center console switch block;
23. Interior fuse panel – driver-side lateral dashboard end panel;
24. Engine compartment main fuse and relay panel 1;
25. Engine compartment auxiliary fuse and relay panel 2;
26. Rear interior fuse and relay distribution block – beneath the rear seat cushion;
27. High-Intensity Discharge (Xenon/HID) headlamp control ballast, left;
28. High-Intensity Discharge (Xenon/HID) headlamp control ballast, right;
29. Automatic dynamic headlamp range adjustment (LWR) control module (Xenon/HID equipped models);
30. Dual-tone signal horns – mounted behind the front bumper fascia;
31. Electronic Ignition Switch (EIS / EZS) control unit;
32. Engine immobilizer control module – integrated into the Electronic Ignition Switch (EIS);
34. Exterior lighting switch and integrated lighting control module;
35. Front SAM / multi-function control module 1 (through 02/97) – controls central locking, power windows, sunroof, hazard warning lights, rear window defroster, turn indicators, power steering column adjustment, and windshield wipers;
36. Overhead control panel (OCP) / multi-function control module 2 (from 03/97) – controls interior courtesy lighting, sliding sunroof, and vanity mirror illumination;
37. Navigation system computer / processor – integrated into the COMAND / audio head unit;
38. Ambient outside air temperature sensor;
39. Parktronic System (PTS) control module (through 06/99);
40. Parktronic System (PTS) control module (from 07/99);
41. Automatic rain / light sensor – bonded to windshield behind the interior rearview mirror;
42. Engine compartment relay module K40/4 (through 02/97) – houses ABS pump relay, engine management main relay, cooling fan relay, fuel pump relay, secondary air injection (AIR) pump relay, and electronic throttle actuator relay;
43. Engine compartment relay module K40/2 (from 03/97) – houses secondary air injection (AIR) pump relay, starter relay, and overvoltage protection (OVP) relay for ABS;
44. Front left power seat memory and adjustment control module;
45. Front right power seat memory and adjustment control module;
46. Front seat heater control module – integrated into the center console lower switch panel;
47. Rear seat heater control module – mounted beneath the rear seat cushion;
48. Side impact crash sensor, left side (select models) – beneath front seat;
49. Side impact crash sensor, left side (select models) – beneath rear seat cushion;
50. Side impact crash sensor, right side (select models) – beneath front seat;
51. Side impact crash sensor, right side (select models) – beneath rear seat cushion;
52. SRS (Supplemental Restraint System / Airbag) electronic control module (airbag crash computer);
53. Electronic steering column lock (ESL) actuator control unit;
54. Front axle level / suspension height sensor (models equipped with Xenon/HID headlamps or ADS);
55. Rear axle level / suspension height sensor (models equipped with Xenon/HID headlamps or ADS);
56. Cellular telephone interface compensator module (through 06/98) – left-hand side of luggage compartment;
57. Cellular telephone interface control unit (from 07/98) – left-hand side of luggage compartment;
59. Electronic Transmission Control (ETC / EGS) module;
60. Electronic Selector Lever Module (ESM) – integrated with automatic transmission floor shifter assembly;
61. Voice Control System (Linguatronic) module – left-hand side of luggage compartment.
i have a 2001 e430 and i can not find the starter relay at all i looked in both boxes under the hood where eals would it be
Tengo un mercedes 300td w210 cuál es el relé de arranque