The Mercedes-Benz M-Class debuted at the Detroit Auto Show in early 2005, sharing its engineering platform with the R-Class (W251) and GL-Class (X164). The unibody (load-bearing body) construction replaced the frame structure of the previous generation, enhancing passive safety while altering off-road dynamics. Below are the detailed fuse box diagrams and relay assignments for the Mercedes-Benz W164 M-Class (ML350, ML500, ML550, ML620) for model years 2005, 2006, 2007, 2008, 2009, 2010, and 2011.
Below you will find the locations, diagrams, and photos of the power distribution boxes. Fuses for the **Cigarette Lighter** and **Fuel Pump** are highlighted in bold text.
In the luggage compartment
The rear luggage compartment power distribution box is located behind the side trim panel on the right side.
Representative example shown.
| Diagram | ||
|---|---|---|
| Models up to May 2006 | ||
|
||
| No. | Circuit / Protected Component | Rating (A) |
| F20 | Antenna amplifier module | 5 |
| F21 | Rear climate control system (A/C) | 5 |
| F22 | 5 | |
| F23 | 10 | |
| F24 | Supplemental Restraint System (SRS) | 40 |
| F25 | Navigation system module | 15 |
| F26 | 25 | |
| F27 | 30 | |
| F28 | 30 | |
| F29 | Supplemental Restraint System (SRS) | 40 |
| F30 | 40 | |
| F31 | Heated steering wheel | 10 |
| F32 | AIRMATIC / Suspension control module | 15 |
| F33 | KEYLESS-GO remote control module | 25 |
| F34 | 25 | |
| F35 | Audio system amplifier | 30 |
| F36 | Telematics system (mbrace / Emergency call) | 10 |
| F37 | Backup camera module | 5 |
| F38 | TV tuner module | 10 |
| F39 | Tire Pressure Monitoring System (TPMS) | 7.5 |
| F40 | Power tailgate / liftgate closure module | 40 |
| F41 | Interior lighting system | 25 |
| F42 | Power sunroof module | 25 |
| F43 | Rear window wiper / washer system | 20 |
| F44 | 20 | |
| F45 | 20 | |
| F46 | Mercedes M-Class W164 Cigarette Lighter Fuse | 15 |
| F49 | Heated rear window (defogger) | 30 |
| F50 | Rear window wiper / washer system | 10 |
| F51 | Evaporative emission (EVAP) purge valve switch | 5 |
| F52 | Supplemental Restraint System (SRS) | 5 |
| F53 | 5 | |
| F54 | 5 | |
| F55 | 7.5 | |
| F56 | Data Link Connector (DLC / OBD-II) | 5 |
| F57 | Mercedes M-Class W164 Fuel Pump Fuse | 20 |
| F58 | 7.5 | |
| F59 | - | |
| F60 | 5 | |
| F61 | Supplemental Restraint System (SRS) | 10 |
| F62 | 30 | |
| F63 | 30 | |
| F67 | Auxiliary climate control / heater fan | 25 |
| F68 | 25 | |
| F70 | Trailer hitch electrical connector | 15/20 |
| F71 | 30 | |
| F72 | 15 | |
| No. | Relay | |
| 1 | ||
| 2 | ||
| 3 | ||
| 4 | Fuel pump relay | |
| 5 | Rear wiper motor relay | |
| 6 | ||
| 7 | ||
| 8 | Trailer connector power supply relay | |
| 9 | Rear window defogger relay | |
| Models after June 2006 | ||
|
||
| No. | Circuit / Protected Component | Rating (A) |
| F20 | Antenna amplifier module | 5 |
| F21 | Rear climate control system (A/C) | 5 |
| F22 | 5 | |
| F23 | 10 | |
| F24 | Supplemental Restraint System (SRS) | 40 |
| F25 | Navigation system module | 15 |
| F26 | Front right door control module | 25 |
| F27 | 30 | |
| F28 | 30 | |
| F29 | Supplemental Restraint System (SRS) | 40 |
| F30 | 40 | |
| F31 | Heated steering wheel | 10 |
| F32 | AIRMATIC / Suspension control module | 15 |
| F33 | KEYLESS-GO remote control module | 25 |
| F34 | Front left door control module | 25 |
| F35 | Audio system amplifier | 30 |
| F36 | Telematics system (mbrace / Emergency call) | 10 |
| F37 | Backup camera module | 5 |
| F38 | TV tuner module | 10 |
| F39 | Tire Pressure Monitoring System (TPMS) | 7.5 |
| F40 | Power tailgate / liftgate closure module | 40 |
| F41 | Interior lighting system | 25 |
| F42 | Power sunroof module | 25 |
| F43 | - | |
| F44 | - | |
| F45 | Rear power distribution / relay module | 20 |
| F46 | Cigarette Lighter Fuse Mercedes W164 – ML350, ML500, ML550, ML620 | 15 |
| F47 | - | |
| F48 | - | |
| F49 | Heated rear window (defogger) | 30 |
| F50 | Rear window wiper / washer system | 15 |
| F51 | Evaporative emission (EVAP) purge valve switch | 5 |
| F52 | Supplemental Restraint System (SRS) | 5 |
| F53 | 5 | |
| F54 | Headlamp range adjustment switch | 5 |
| F55 | 7.5 | |
| F56 | - | |
| F57 | Fuel Pump Fuse | 20 |
| F58 | 7.5 | |
| F59 | - | |
| F60 | 5 | |
| F61 | Supplemental Restraint System (SRS) | 10 |
| F62 | 30 | |
| F63 | 30 | |
| F64 | - | |
| F65 | - | |
| F66 | - | |
| F67 | Auxiliary climate control / heater fan | 25 |
| F68 | 25 | |
| F69 | - | |
| F70 | Trailer hitch electrical connector | 15/20 |
| F71 | 30 | |
| F72 | 15 | |
| No. | Relay | |
| 1 | Trailer connector power supply relay | |
| 2 | ||
| 3 | Power seat relay | |
| 4 | Auxiliary ignition relay (Circuit 15R) | |
| 5 | Fuel pump relay | |
| 6 | Rear wiper motor relay | |
| 7 | ||
| 8 | Rear window defogger relay | |
| 9 | ||
| 10 | 12V accessory power socket relay | |
| 11 | Trailer connector power supply relay | |
In the passenger compartment
The interior passenger compartment houses two fuse blocks that protect vehicle electrical circuits.
Fuse box #1
The main cabin fuse panel (F3) is located on the right side of the instrument panel/dashboard.
| Diagram | ||
|---|---|---|
|
||
| No. | Circuit / Protected Component | Rating (A) |
| F10 | Auxiliary HVAC blower motor | 10 |
| F11 | Instrument cluster module | 5 |
| F12 | Climate control unit (HVAC) | 15 |
| F13 | Steering column module (MRM) | 5 |
| F14 | 7.5 | |
| F15 | Digital compass module | 5 |
Fuse box #2
The pre-fuse block (F33) is located beneath the front passenger seat adjacent to the main battery.
| Diagram | ||
|---|---|---|
|
||
| No. | Circuit / Protected Component | Rating (A) |
| F78 | Auxiliary PTC electric heater element | 150 |
| F79 | 60 | |
| F80 | 60 | |
| F81 | - | |
| F82 | Rear power distribution box / fuse block feed | 150 |
| F83 | Passenger seat occupancy sensor module | 5 |
| F84 | Supplemental Restraint System (SRS) control module | 10 |
| F85 | Electronic Transmission Control (ETC) module | 30 |
| F86 | Cockpit / Instrument panel fuse box feed | 30 |
| F87 | Transfer case control module | 30 |
| F88 | 70 | |
| F89 | 70 | |
| F90 | 70 | |
| F91 | HVAC main blower motor module | 40 |
In the engine compartment
The main engine compartment fuse and relay box (F58) is located on the driver side of the engine bay under a protective cover.
General view of the Mercedes M-Class W164 engine compartment fuse panel.
| Diagram | ||
|---|---|---|
|
||
| No. | Circuit / Protected Component | Rating (A) |
| F100 | Windshield wiper / washer system | 30 |
| F101 | 15 | |
| F102 | 15 | |
| F103 | Engine Control Module (ECM / ECU) | 25 |
| F104 | 15 | |
| F105 | 15 | |
| F106 | - | |
| F107 | Secondary air injection pump | 40 |
| F108 | AIRMATIC suspension compressor | 40 |
| F109 | Electronic Stability Program (ESP) module | 25 |
| F110 | Anti-theft alarm siren | 10 |
| F111 | Electronic Transmission Control module | 30 |
| F112 | Headlamp control assembly | 7.5 |
| F113 | Dual horns | 15 |
| F114 | - | |
| F115 | Electronic Stability Program (ESP) module | 5 |
| F116 | Electronic Transmission Control module | 7.5 |
| F117 | DISTRONIC adaptive cruise control module | 7.5 |
| F118 | Engine Control Module (ECM) | 5 |
| F119 | - | |
| F120 | Engine Control Module (ECM) | 10 |
| F121 | - | |
| No. | Relay | |
| 1 | Unassigned | |
| 2 | Unassigned | |
| 3 | Gasoline models: Auxiliary coolant pump relay | |
| 4 | Engine management main relay (Circuit 87) | |
| 5 | Secondary air injection pump relay | |
| 6 | Horn relay | |
| 7 | AIRMATIC suspension compressor relay | |
| 8 | Unassigned | |
| 9 | Starter motor relay | |
All electrical equipment
Overview of vehicle electronic control unit (ECU) locations.
1. ABS / ESP control module;
2. Climate control panel (HVAC control unit);
3. HVAC blower motor resistor / regulator (adjacent to blower motor);
4. Sun/rain/light sensor (upper center windshield);
5. Antenna amplifier (liftgate / tailgate);
6. Front impact sensor, driver side;
7. Front impact sensor, passenger side;
8. Side impact sensor, driver side (B-pillar);
9. Side impact sensor, passenger side (B-pillar);
10. Anti-theft alarm siren;
11. Audio system amplifier (under seat);
12. Auxiliary heater control unit (behind wheel arch);
13. Auxiliary heater receiver / control module (under left rear seat);
14. Main battery (under front passenger seat);
15. DISTRONIC control module (adaptive cruise control);
16. Central Gateway Module (CGW / CAN bus);
17. Data Link Connector (DLC / OBD-II);
18. Differential lock control module (under trunk floor panel);
19. Driver door control module (inside door panel);
20. Front passenger door control module (inside door panel);
21. Engine Control Module (ECM), V8 models (front passenger footwell);
22. Engine Control Module (ECM), V6 models (top of engine);
23. Engine Control Module (ECM), Diesel models (behind wheel arch liner);
24. Radiator cooling fan control module (integrated in fan assembly);
25. Left fuel pump control module (under rear seat);
26. Right fuel pump control module (under rear seat);
27, 28. Fuse/relay boxes (engine compartment);
29. Cockpit fuse box (instrument panel, right side);
30. Rear fuse/relay box (luggage compartment, right rear trim panel);
31. Pre-fuse box (under front passenger seat);
32. Left headlamp control module (Xenon/Bi-Xenon);
33. Right headlamp control module (Xenon/Bi-Xenon);
34. Automatic headlamp leveling control module (under seat);
35. Left horn;
36. Right horn;
37. Electronic Ignition Switch (EIS / EZS) control module;
38. Instrument cluster;
39. KEYLESS-GO control module (right side of luggage compartment);
40. Front Signal Acquisition and Actuation Module (Front SAM / Multifunction Module 1) - footwell - Controls: Central locking, power windows, fog lamps, low/high beam headlamps, seat heating, heated washer nozzles, headlamp washers, horn, turn signals, windshield wiper/washer system;
41. Rear Signal Acquisition and Actuation Module (Rear SAM / Multifunction Module 2) - rear fuse box - Controls: Anti-theft alarm system, rear central locking, rear window defogger, rear wiper/washer, tail lamps, rear turn signals, passenger power seat relay, brake lamps, power tailgate, trailer wiring module;
42. Overhead Control Panel (OCP / Multifunction Module 3) - overhead console - Controls: Interior lighting, power sunroof, garage door opener (HomeLink), rain/light sensor, anti-theft interior motion sensor;
43. Navigation system module;
44. PARKTRONIC system (PTS) control module (under seat);
45. Power rear seat folding control module (under left rear seat);
46. Backup camera control module (under seat);
47. Driver seat power adjustment module (under seat);
48. Front passenger seat power adjustment module (under seat);
49. Heated rear seats control module (under right rear seat);
50. Passenger seat occupancy recognition module (under seat);
51. Steering column module (SMC / MRM) (under steering wheel);
52. Power sunroof control module;
53. Supplemental Restraint System (SRS / Airbag) control module;
54. AIRMATIC / Adaptive Damping System (ADS) suspension module;
55. Power tailgate / rear door control module (under trunk floor);
56. Cellular telephone / Bluetooth control module (under left rear seat);
57. Transfer case control module;
58. Electronic Transmission Control module (ETC / TCU - inside transmission);
59. Transmission control module (mounted on transmission);
60. Tire Pressure Monitoring System (TPMS) module (mounted on rear fuse box);
61. Voice control module (LINGUATRONIC - under left rear seat);
62. Yaw rate / lateral acceleration sensor.