The Mercedes-Benz E-Class includes a wide variety of body styles. The sedan (W212) debuted in spring 2009. In May 2009, the CLK-Class coupe and cabriolet were succeeded by the E-Class coupe (chassis code C207), followed by the wagon (S212) in late 2009. The A207 cabriolet launched in March 2010. This article provides detailed fuse box diagrams and terminal assignments for the Mercedes-Benz W212 E-Class (models E200, E250, E300, E350, and E500) across the 2009–2016 model years.
Here you will find fuse box locations, photos, and terminal assignments. Fuses responsible for the “Cigarette Lighter” and “Fuel Pump” are highlighted in bold.
Engine Compartment
Component layout.
Main Fuse Box
This fuse box is located on the left side of the engine compartment, near the windshield.
Sample photo.
| Diagram | ||
|---|---|---|
|
||
| No. | Relay | |
| J | Terminal 15 | |
| K | Terminal 15R | |
| L | Wiper rest area heater | |
| M | Terminal 50, starter | |
| N | Terminal 87, engine | |
| O | Horn relay | |
| P | Secondary air injection pump (M272 engine) | |
| Q | Auxiliary transmission oil pump relay | |
| R | Terminal 87 relay, chassis/suspension | |
| No. | A | Protected Circuit / Component |
| 1 | 25 | ESP (Electronic Stability Program) control unit (LHD) |
| Regenerative braking system control unit (LHD) | ||
| Blower regulator (RHD) | ||
| 2 | 30 | Front left door control unit (up to May 31, 2010) |
| Rear left door control unit (from June 1, 2010; RHD) | ||
| 3 | 30 | Front right door control unit (up to May 31, 2010) |
| Rear right door control unit (from June 1, 2010; LHD) | ||
| 4 | 20 | Fuel pump control unit (fuel pump fuse) (M157 engine) |
| 7.5 | Fuel filter condensate sensor control unit with heating element (OM651 engine) | |
| 20 | Fuel filter condensate sensor heating element (OM642, OM651 engines; up to May 31, 2010) | |
| 5 | 7.5 | Instrument cluster |
| Exterior lamp switch | ||
| Rear SAM control unit with fuse and relay module | ||
| ESP control unit (from March 1, 2013) | ||
| 6 | 10 | Diesel models: CDI control unit |
| Gasoline models: ME control unit | ||
| M271.958, M274.920 engines: Natural gas drive (CNG) control unit | ||
| 7 | 20 | Terminal 50 starter relay: Starter |
| 8 | 7.5 | Supplemental Restraint System (SRS) control unit |
| 9 | 15 | Glove compartment power outlet |
| 10 | 30 | Wiper motor |
| 30 | Wiper rest area heater | |
| 11 | 7.5 | Audio display / COMAND display |
| Audio / COMAND control panel | ||
| Navigation module | ||
| Navigation module bracket | ||
| COMAND cooling fan motor | ||
| 12 | 7.5 | Climate control unit |
| 7.5 | Upper Control Panel (UCP) control unit | |
| 7.5 | Transmissions 722, 724, 725: Transmission program switch | |
| With Code 489 (AIRMATIC): Suspension control switch group | ||
| 13 | 7.5 | Steering column module |
| Multifunction camera | ||
| Multifunction stereo camera (from March 1, 2013) | ||
| 14 | 7.5 | ESP control unit |
| 15 | 7.5 | Supplemental Restraint System (SRS) control unit |
| 16 | 5 | Electric A/C compressor |
| DIRECT SELECT module (transmissions 722.930/931) | ||
| Electronic selector lever module control unit (722 transmissions, except 722.930/931) | ||
| 17 | 30 | Overhead Control Panel (OCP) control unit |
| Panoramic sliding sunroof control unit | ||
| 18 | 7.5 | Exterior lamp rotary switch |
| Instrument panel switch group (up to February 28, 2013) | ||
| Upper control panel control unit (up to February 28, 2013) | ||
| Auxiliary transmission oil pump relay (722 transmissions) | ||
| Power electronics control unit | ||
| 19 | 20 | Electronic ignition lock (EIS) control unit |
| Electric steering lock (ESL) control unit | ||
| 20 | 40 | ESP control unit (LHD) |
| Regenerative braking system control unit (LHD) | ||
| 21 | 7.5 | Brake light switch (up to February 28, 2013) |
| Hybrid brake light switch (up to February 28, 2013) | ||
| Glove compartment light | ||
| Front passenger seat occupancy / child seat recognition (AKSE) | ||
| Weight Sensing System (WSS) control unit | ||
| 22 | 15 | Combustion engine / AC suction fan with integrated control (650 W, 800 W) |
| M156 engine: | ||
| Interior/engine compartment wiring harness connector | ||
| Terminal 87 M2e connector sleeve | ||
| M271, M272.98, M274.9, M276, and OM651 engines (except 4MATIC): | ||
| Radiator shutter actuator | ||
| M157, M271, M272, M273, M274, M276, M278 engines: | ||
| Interior/engine compartment wiring harness connector | ||
| OM642, OM651 engines: | ||
| CDI control unit | ||
| Interior/engine compartment wiring harness connector | ||
| 23 | 20 | Diesel models: Rear SAM control unit with fuse and relay module |
| M271, OM642, OM651 engines: Terminal 87 M1e connector sleeve | ||
| M156, M157, M271, M272, M273, M274, M276, M278, OM642, OM651 engines: Interior/engine compartment wiring harness connector | ||
| M271 engine: ME control unit | ||
| 24 | 15 | M156, M157, M271, M272, M273, M274, M276, M278, OM642, OM651 engines: Interior/engine compartment wiring harness connector |
| Diesel models: CDI control unit | ||
| Gasoline models: ME control unit | ||
| M271.958, M274.920 engines: CNG control unit | ||
| 25 | 15 | OM642, OM651 engines: |
| NOx sensor control unit downstream of diesel particulate filter | ||
| NOx sensor control unit downstream of SCR catalytic converter | ||
| Particulate / soot sensor control unit | ||
| Gasoline models: | ||
| ME control unit | ||
| Model variants 212.095 / 098 / 298: | ||
| Transmission oil cooler circulation pump relay | ||
| HYBRID power electronics coolant circulation pump relay | ||
| M156 engine: | ||
| Terminal 87 M3e connector sleeve | ||
| 26 | 20 | Audio module |
| COMAND unit | ||
| 27 | 7.5 | Electronic ignition lock control unit |
| Diesel models: | ||
| CDI control unit | ||
| Gasoline models: | ||
| ME control unit | ||
| M271.958, M274.920 engines: | ||
| CNG control unit | ||
| 28 | 7.5 | Instrument cluster |
| 29 | 10 | Right headlight (up to February 28, 2013) |
| 30 | 10 | Left headlight (up to February 28, 2013) |
| 31A | 15 | Left horn |
| Right horn | ||
| 31B | 15 | Left horn |
| Right horn | ||
| 32 | 40 | Secondary air injection pump |
| 33 | 10 | Electronic transmission control unit (722.6 transmission) |
| 10 | Fully integrated transmission control (VGS) unit (722.9, 724, 725 transmissions) | |
| 34 | 7.5 | M156 engine: |
| Fuel pump control unit | ||
| M271, M272, M273, OM642, OM651 engines: | ||
| Fuel pump control unit | ||
| 35 | 7.5 | HYBRID control unit power relay |
| 36 | 7.5 | Night View Assist control unit |
| DISTRONIC control unit (up to February 28, 2013) | ||
| Front radar distance sensor (from March 1, 2013) | ||
| COLLISION PREVENTION ASSIST control unit (from March 1, 2013) | ||
Pre-Fuse Box / Auxiliary Fuse Box
Diagrams.
| Models with ECO Start/Stop System | ||
|
||
| Code | A | Description |
| R8 | 350 | Alternator |
| Auxiliary heater control unit | ||
| MR4 | 100 | Engine / AC suction fan with integrated control (650 W, 800 W) |
| MR5 | 150 | Diesel models: Electric auxiliary heater |
| MR6 | 60 | Front SAM control unit with fuse and relay module |
| MR7 | 150 | |
| MR9 | - | Spare |
| MG2 | 100 | Front SAM control unit with fuse and relay module |
| MR3 | 80 | Electric power steering (EPS) control unit |
| IG1 | 150 | Rear SAM control unit with fuse and relay module |
| IM1 | 100 | |
| PIN1 | 50 | Blower regulator (LHD) |
| ESP control unit signals (RHD) | ||
| ESP Premium control unit (RHD) | ||
| PIN2 | 50 | ESP control unit signals (RHD) |
| ESP Premium control unit (RHD) | ||
| PIN3 | 60 | AIRMATIC relay |
| Fully integrated transmission control module (725 transmission) | ||
| Models without ECO Start/Stop System | ||
|
||
| MR8 | - | Thermal fuse (triggered by SRS control unit) |
| MR1 | 50 | Electric power steering (EPS) control unit |
| MR2 | - | Spare |
| MR3 | - | Spare |
| MR4 | 100 | Engine / AC suction fan with integrated control (650 W, 800 W) |
| MR5 | 150 | Diesel models: Electric auxiliary heater |
| MR6 | 60 | Front SAM control unit with fuse and relay module |
| MR7 | 150 | |
| PIN1 | 50 | Blower regulator (LHD) |
| ESP control unit signals (RHD) | ||
| ESP Premium control unit (RHD) | ||
| PIN2 | 50 | ESP control unit signals (RHD) |
| ESP Premium control unit (RHD) | ||
| PIN3 | 60 | AIRMATIC relay |
| Fully integrated transmission control module (725 transmission) | ||
| MRG1 | - | Spare |
| MRG2 | 100 | Front SAM control unit with fuse and relay module |
| IG1 | 150 | Rear SAM control unit with fuse and relay module |
| I1 | 100 | |
| Hybrid Models | ||
|
||
| MR8 | - | Thermal fuse (SRS control) |
| MR4 | 100 | Engine / AC suction fan with integrated control (650 W, 800 W) |
| MR5 | 150 | Diesel models: Electric auxiliary heater |
| MR6 | 60 | Front SAM control unit with fuse and relay module |
| MR7 | 150 | |
| MR9 | 150 | HYBRID fuse and relay module |
| MG2 | 100 | Front SAM control unit with fuse and relay module |
| MR3 | 80 | Electric power steering (EPS) control unit |
| IG1 | 150 | Rear SAM control unit with fuse and relay module |
| IM1 | 100 | Rear SAM control unit with fuse and relay module |
| PIN1 | 50 | Blower regulator (LHD) |
| Regenerative braking system control unit (RHD) | ||
| PIN2 | 50 | Regenerative braking system control unit (RHD) |
| PIN3 | 60 | AIRMATIC relay |
Auxiliary Fuse Box (Hybrid Models)
Located near the right headlight.
| Diagram | ||
|---|---|---|
|
||
| No. | A | Description |
| 130 | 5 | Regenerative braking system control unit |
| 131 | 5 | Battery management system (BMS) control unit |
| 132 | Spare | |
| 133 | 5 | Power electronics control unit |
| 134 | 5 | Vacuum pump relay (-) |
| 135 | 7.5 | Battery management system (BMS) control unit |
| 136 | 7.5 | Pyrotechnic safety switch (pyrofuse) |
| 137 | 7.5 | Coolant circulation pump 1 |
| 138 | 7.5 | Coolant circulation pump 2 |
| 139 | 7.5 | OM651 engine: Transmission coolant circulation pump |
| 140 | 40 | Vacuum pump relay (+) |
| 141 | Spare | |
| 142 | Spare | |
| S | Transmission coolant circulation pump relay | |
| T | HYBRID control unit power relay | |
| U | HYBRID power electronics coolant circulation pump relay | |
Luggage Compartment
This area contains two power distribution boxes that protect the electrical circuits.
Fuse Box
Located on the right side behind the side trim panel (Sedan).
Located on the right side behind the side trim panel (Station Wagon).
Representative illustration shown.
| Layout Diagram | ||
|---|---|---|
|
||
| No. | Relay Assignment | |
| A | Terminal 15 relay | |
| B | Terminal 15R relay (1) | |
| C | Heated rear window relay | |
| D | Diesel models: Fuel module relay | |
| E | Rear window wiper relay | |
| F | Power seat adjustment relay | |
| G | Terminal 15R relay (2) | |
| No. | A | Protected Circuit / Component |
| 37 | 7.5 | NECK-PRO driver seat head restraint solenoid |
| NECK-PRO front passenger seat head restraint solenoid | ||
| 38 | 15 | Rear window wiper motor |
| 39 | 30 | Rear left door control module (up to May 31, 2010) |
| Front left door control module (from June 1, 2010; RHD) | ||
| 40 | - | Spare |
| 41 | 30 | Rear right door control module (up to May 31, 2010) |
| Front right door control module (from June 1, 2010; LHD) | ||
| 42 | 25 | Electric fuel pump relay (W212 fuel pump fuse) |
| 25 | Engines 156, 271, 272, 273, 274, 276, 278, 642, 651: Fuel pump control module | |
| 43 | 7.5 | Telematics service communication module |
| 44 | 30 | Semi-electric front passenger seat position adjustment switch |
| 45 | 30 | Semi-electric driver seat position adjustment switch |
| 46 | 7.5 | FM1, AM, central locking (ZV), and KEYLESS-GO antenna amplifier |
| Models 212.0 / 212.1: | ||
| Rear window antenna amplifier 1 | ||
| Model 212.2: | ||
| DAB III antenna | ||
| Alarm siren (H3/1) | ||
| Interior motion sensor and tow-away protection control module | ||
| From June 1, 2011 (Engines 157, 276, 278): | ||
| Coolant circulation pump relay | ||
| 47 | - | Spare Spare |
| 48 | - | |
| 49 | 40 | Heated rear window (via rear window heater relay) |
| 50 | 50 | Front right reversible emergency tensioning retractor (ETR) |
| 51 | 50 | Front left reversible emergency tensioning retractor (ETR) |
| 52 | - | Spare |
| 53 | 30 | Trailer recognition control module |
| 54 | 15 | |
| 55 | - | Spare |
| 56 | 15 | Trailer towing socket |
| 57 | 20 | Trailer recognition control module |
| 7.5 | Models 212.074 / 075 / 076 / 077 / 092 / 274 / 275 / 276 / 277 / 292: | |
| Illuminated door sill trim inverter, front left | ||
| Illuminated door sill trim inverter, front right | ||
| 58 | 25 | Trailer recognition control module |
| 59 | 7.5 | DISTRONIC (DTR) radar sensor, front bumper left |
| DISTRONIC (DTR) radar sensor, front bumper right | ||
| 60 | 7.5 | Multicontour seat pneumatic pump |
| 30 | Drive-Dynamic multicontour seat pneumatic pump | |
| 61 | 40 | Trunk lid / tailgate drive control module |
| Trunk lid / tailgate lock drive control module | ||
| 62 | 25 | Driver seat control module |
| 63 | 25 | Heated rear seat control module |
| 64 | 25 | Front passenger seat control module |
| 65 | 7.5 | Heated steering wheel control module (up to Feb 28, 2013) |
| 10 | Direct-Select steering column module (MRM) (from Mar 1, 2013) | |
| 66 | 7.5 | Rear passenger compartment climate blower motor |
| 67 | 40 | Audio system amplifier control module |
| 68 | 15 | AIRMATIC control module |
| 15 | Rear axle self-leveling suspension control module | |
| 69 | 25 | Subwoofer amplifier |
| 70 | 5 | Tire pressure monitoring system (TPMS) control module |
| 71 | 15 | Front passenger compartment auxiliary power outlet |
| Cigarette lighter (W212 fuse) | ||
| 72 | 15 | Luggage compartment auxiliary power socket |
| 73 | 5 | Diagnostic link connector (DLC) |
| Auxiliary heater RF remote control receiver | ||
| Transmission control module (722.930 / 931) | ||
| 74 | 15 | KEYLESS-GO control module |
| 15 | From Mar 1, 2013 with Code 641 (Dynamic LHD LED headlights) or Code 642 (Dynamic RHD LED headlights): | |
| Front right headlamp | ||
| 15 | Code 631 (Static LHD LED headlights) or Code 632 (Static RHD LED headlights): | |
| Front left headlamp unit (from Mar 1, 2013) | ||
| Front right headlamp | ||
| 15 | DC/AC inverter (from Dec 1, 2011) | |
| 75 | 20 | Auxiliary heater unit |
| 25 | Oil cooler fan motor relay (Engine 156) | |
| 20 | From Mar 1, 2013 with Code 641 (Dynamic LHD LED headlights) or Code 642 (Dynamic RHD LED headlights): | |
| Front left headlamp | ||
| 20 | From Mar 1, 2013 with Code 631 (Static LHD LED headlights) or Code 632 (Static RHD LED headlights): | |
| Front left headlamp | ||
| Front right headlamp | ||
| 76 | 15 | Rear cup holder |
| Rear center console power outlet | ||
| Rear USB interface socket | ||
| 77 | 7.5 | Weight Sensing System (WSS) control module (up to Feb 28, 2013) |
| Navigation control unit (China, Korea) | ||
| Rear cup holder | ||
| 78 | 7.5 | Media Interface control module |
| External audio interface module | ||
| 79 | 5 | Radar sensors (up to May 31, 2010) |
| Video and radar sensor control module (SMPC) (from June 1, 2010) | ||
| Chassis CAN bus gateway control module (from Mar 1, 2013) | ||
| 80 | 5 | PARKTRONIC / Active Parking Assist control module |
| 81 | 5 | Antenna amplifier / cellular compensator |
| Mobile phone cradle / interface connector | ||
| Navigation control unit (China, Korea) | ||
| 82 | 10 | Front left seat ventilation blower regulator |
| Front right seat ventilation blower regulator | ||
| 83 | 7.5 | Terminal 15R splice node |
| Navigation control unit (China, Korea) | ||
| Emergency Call (eCall) system control module | ||
| Electronic Toll Collection (ETC) control module (Japan) | ||
| 84 | 5 | Rearview camera (from Mar 1, 2013) |
| 360° camera control module (from Mar 1, 2013) | ||
| SDAR / HD Radio tuner control module (SIRIUS Satellite Radio) (up to May 31, 2010) | ||
| Satellite Digital Audio Radio (SDAR) control module (SIRIUS) (from June 1, 2010) | ||
| Digital Audio Broadcasting (DAB) control module | ||
| Rearview camera control module (Japan) | ||
| Rearview camera power supply module (Japan) | ||
| 85 | 7.5 | TV tuner (analog/digital) (up to Feb 28, 2015) |
| Digital TV tuner (up to Feb 28, 2015) | ||
| TV tuner module (from Mar 1, 2015) | ||
| 86 | 7.5 | DVD player |
| Rear seat display, left | ||
| Rear seat display, right | ||
| 87 | 7.5 | Emergency Call (eCall) system control module |
| Coolant circulation pump relay (from June 1, 2011; USA) | ||
| Telematics service communication module (from Mar 1, 2015) | ||
| Special vehicle multifunction control module (N26/14) | ||
| 88 | 15 | DIRECT SELECT gearshift intelligent servo module (ISM) (Transmission 722.9) |
| 89 | 30 | Trailer recognition control module |
| Special vehicle multifunction control module (MSS) | ||
| Fuel pump control module (up to Feb 28, 2013; Engine 157) | ||
| From Mar 1, 2013 with Code 632 (Static RHD LED headlights) and Code 494 (US version): | ||
| Front right headlamp | ||
| From Mar 1, 2013 with Code 642 (SAE dynamic RHD LED headlights) and Code 494 (US version): | ||
| Front left headlamp | ||
| Front right headlamp | ||
| 90 | 40 | AdBlue® fuse block (Engine 642.8) |
| Models 212.076 / 212.276: | ||
| Coolant circulation pump relay | ||
| 91 | 10 | Front SAM control module with fuse and relay module (Transmission 722) |
| 92 | 15 | KEYLESS-GO control module |
| HANDS-FREE ACCESS trunk opening sensor module (from Mar 1, 2013) | ||
| DC/AC inverter control module (up to Nov 30, 2011) | ||
High-Current Fuse Panel
The high-current fuse panel is located in the luggage compartment near the main battery.
| Layout Diagram | ||
|---|---|---|
|
||
| No. | A | Protected Circuit / Function |
| 170 | - | Spare |
| 171 | 60 | Front SAM control module |
| 172 | 100 | Rear SAM control module |
Electrical System Component Overview
General component layout for the Mercedes-Benz W212 electrical system.
1. ABS/ESP control module;
2. Climate control module — integrated into the HVAC control panel;
3. HVAC blower motor regulator module — adjacent to the blower motor;
4. Antenna amplifier 1 — C-pillar;
5. Antenna amplifier 2 — C-pillar;
6. Anti-theft alarm siren — behind front right wheel arch liner;
7. Auxiliary battery — under trunk floor lining;
8. Auxiliary battery — for DIRECT SELECT steering column shifter;
9. Auxiliary battery cut-off relay — under trunk floor lining;
10. Main battery (except Engine 273);
11. Main battery (Engine 273) — luggage compartment;
12. Battery current sensor/relay — integrated into engine compartment pre-fuse box;
13. Remote trunk closing/opening control module — under rear parcel shelf;
14. Diagnostic link connector (DLC);
15. Front left door control module;
16. Rear left door control module;
17. Front right door control module;
18. Rear right door control module;
19. Engine control module (Diesel) — Engine 651;
20. Engine control module (Diesel) — except Engine 651;
21. Engine control module (Gasoline) — Engine 271;
22. Engine control module (Gasoline) — except Engine 271;
23. Fuel pump control module — under rear seat cushion;
24. Engine compartment fuse and relay box;
25. Under-hood auxiliary fuse box;
26. Passenger compartment fuse box;
27. Trunk fuse and relay box 1 — behind right rear trim panel;
28. Trunk fuse and relay box 2 — under floor panel (Engine 273);
29. Glow plug control module;
30. Headlamp control module, left (xenon headlamps);
31. Headlamp control module, right (xenon headlamps);
32. Horn 1 — behind front bumper;
33. Horn 2 — behind front bumper;
34. Electronic ignition switch (EZS/EIS) control module;
35. Central locking and keyless start control module — behind right rear trim panel;
36. Exterior lighting control switch module;
37. Front SAM (Signal Acquisition and Actuation Module) — attached to engine compartment fuse/relay box — Functions: A/C compressor clutch, refrigerant pressure sensor, brake fluid level, coolant level switch, exterior lighting, hazard flasher, heated washer nozzles, headlamp washer system, turn signals, interior lighting, ambient temperature sensor, windshield washer pump, windshield wipers;
38. Rear SAM (Signal Acquisition and Actuation Module) — attached to trunk fuse/relay box — Functions: Anti-theft alarm (ATA), trunk lid central locking, power seat memory, fuel filler flap actuator, heated rear window, seat heating, taillamps, rear head restraint release, rear roller sunshade;
39. Upper control panel (UCP) switch module — Functions: Auxiliary heater, seat ventilation, seat heating, PARKTRONIC, rear head restraint release, rear window roller blind, ECO start/stop system;
40. Overhead control panel (OCP) switch module — Functions: Climate control sensors, anti-theft interior motion sensor, interior lighting, reading lamps, panoramic/sliding sunroof;
41. Ambient air temperature sensor;
42. PARKTRONIC control module — under floor carpet;
43. Power seat adjustment control module (left) — under driver seat;
44. Power seat adjustment control module (right) — under passenger seat;
45. Heated seat control module — behind right rear trim panel;
46. Steering column module (MRM) — on steering column;
47. Electric steering column lock (ELV) control module (if equipped);
48. Sunroof motor/control module;
49. Supplemental Restraint System (SRS/Airbag) control module;
50. AIRMATIC / Adaptive Damping System (ADS) control module — under floor carpet;
51. Trailer recognition module — behind right rear trim panel;
52. Electronic transmission control module (EGS for 722.6) — under passenger footwell carpet;
53. Electronic transmission control module (VGS for 722.9) — integrated into transmission valve body;
54. Electronic selector lever module (ESM/EWM);
55. Tire pressure monitoring system (TPMS) control module — above rear axle;
56. DISTRONIC adaptive cruise control module — under floor carpet.
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