Mercedes (M & ML-Class) (2012 – 2015) Fuse Box Location & Diagrams
This article provides detailed fuse box locations and diagram information for the Mercedes M-Class and ML-Class models from 2012 to 2015. Find fuse assignments, relay layouts, and panel locations to help diagnose electrical issues, replace blown fuses, and maintain your vehicle with confidence.
Fuse Box Location
Passenger Compartment Fuse Box
Instrument panel fuse box (Right side)
Pull cover (1) outwards in the direction of the arrow and remove it.
Rear Fuse Box
It’s located under the right-side rear bench seat. Fold the right-hand rear bench seat forward, lift and fold out carpet (1) in the direction of the arrow. Release clamps (2) by pressing them in the direction of the arrow. Fold cover (3) up in the direction of the arrow and remove it.
Battery Compartment Fuse Box
It is located under the front passenger seat in the compartment next to the battery.
Engine Compartment Fuse Box
Open clamps (2), fold up cover (1) in the direction of the arrow and remove it.
Fuse Box Diagrams
Passenger Compartment Fuse Box
Instrument panel fuse box (Right side)
| Type | No. | Description |
| Fuse ATO 7.5A | 10 | Electronic ignition lock control unit |
| Fuse ATO 10A | 11 | Steering column electronic module control unit |
| Fuse ATO 5A | 12 | Instrument cluster |
| Fuse ATO 15A | 13 | Auxiliary fan electronic control |
| Fuse ATO 5A | 14 | Diagnostic connector |
| Fuse ATO 5A | 15 | Upper control box |
| Fuse ATO 15A | 19 | Climate Control Panel |
| Fuse ATO 5A | 20 | Steering column electronic module control unit |
| Fuse ATO 7.5A | 21 | Audio/ COMAND display |
Note: Fuse Box # 22 not used.
Rear Fuse Box
| Type | No. | Description |
|---|---|---|
| Fuse ATO5A | 100 | Audio module, COMAND control module, Electrical plug connection for external navigation |
| Fuse ATO20A | 101 | Trailer detection control unit |
| Fuse ATO7.5A | 102 | Driver’s seat control unit |
| Fuse ATO7.5A | 103 | Front passenger seat control unit |
| Fuse ATO5A | 104 | Antenna amplifier / Mobile phone compensator, Bluetooth module |
| Fuse ATO5A | 105 | Holder for navigation module |
| Fuse ATO5A | 106 | Tailgate control unit |
| Fuse ATO10A | 107 | Release module, 2nd row seats (left/right) |
| Fuse ATO5A | 110 | AdBlue control unit |
| Fuse ATO15A | 111 | Trailer socket |
| Fuse ATO5A | 112 | Fuel pump control unit |
| Fuse ATO5A | 113 | Electric parking brake control unit |
| Fuse ATO5A | 114 | Exterior lighting switch |
| Fuse ATO5A | 115 | Trailer detection control unit |
| Fuse ATO5A | 116 | Radar control unit terminal 87 / Collision Prevention Assist control module |
| Fuse ATO5A | 117 | Night vision control unit |
| Fuse ATO5A | 119 | Transfer case control unit |
| Fuse ATO5A | 120 | Fuel quality sensor / Digital tachograph control unit |
| Fuse ATO30A | 124 | Electrical plug connection for Electric Brake Control function |
| Fuse ATO15A | 126 | Trailer recognition control unit |
| Fuse ATO30A | 127 | Driver seat control unit |
| Fuse ATO20A | 128 | Trailer recognition control unit |
| Fuse ATO30A | 129 | Front passenger seat control unit |
| Fuse ATO20A | 130 | Trailer recognition control unit |
| Fuse ATO25A | 132 | Fuel pump control unit |
| Fuse ATO5A | 133 | Radio remote control receiver for auxiliary heater |
| Fuse ATO5A | 134 | Seat occupied recognition pressure sensor / AKSE front passenger seat |
| Fuse ATO5A | 135 | Glove box light |
| Fuse ATO7.5A | 136 | Supplemental Restraint System (SRS) control unit |
| Fuse ATO5A | 137 | Electronic toll collection prep / rear camera / external navigation plug |
| Fuse ATO15A | 138 | Active roll stabilization control unit |
| Fuse ATO7.5A | 140 | AdBlue control unit |
| Fuse ATO15A | 141 | AdBlue control unit |
| Fuse ATO20A | 142 | AdBlue control unit |
| Fuse ATO7.5A | 145 | Cup holder |
| Fuse ATO30A | 146 | Rear window notch filter |
| Fuse ATO30A | 147 | Audio module, COMAND control module |
| Fuse ATO15A | 148 | Cigarette lighter heating element / cup holder connection |
| Fuse ATO5A | 149 | 115V socket |
| Fuse ATO20A | 150 | Socket in trunk |
| Fuse ATO20A | 151 | Socket (2nd row seats left/right) |
| Fuse ATO30A | 152 | Rear compartment systems control unit |
| Fuse ATO25A | 153 | AC/DC converter control unit |
| Fuse MAXI40A | 154 | Tailgate control unit |
| Fuse ATO15A | 157 | Tailgate wiper motor |
| Relay | A | Socket terminals 15R2 |
| Relay | B | Heated rear window |
| Relay | C | Backup |
| Relay | D | AdBlue |
| Relay | E | Terminal 15 |
| Relay | F | Rear window wiper |
| Relay | G | Terminal 15R1 |
| Relay | H | Backup |
| Relay | I | Backup |
Battery Compartment Fuse Box
| Type | No. | Description |
|---|---|---|
| Fuse MAXI40A | 30 | Speaker amplifier control unit |
| Fuse MAXI30A | 30 | Woofer amplifier |
| Fuse MAXI40A | 31 | Engine compartment fuse and relay module |
| Fuse MAXI40A | 32 | Fan regulator |
| Fuse MAXI40A | 33 | Front left reversible seat belt pretensioner |
| Fuse MAXI40A | 34 | Rear fuse box |
| Fuse MAXI40A | 35 | Front right seat belt reversible pretensioner |
| Fuse MAXI40A | 36 | Fuse box, terminal 30, front panel |
| Fuse MAXI40A | 37 | Test lead |
| Fuse ATO25A | 40 | Electronic rear air conditioning fan control |
| Fuse ATO5A | 45 | Digital tachograph control unit |
| Fuse ATO10A | 47 | Speaker amplifier control unit |
| Fuse ATO30A | 48 | Rear compartment systems control unit |
| Fuse ATO5A | 49 | EDW / Tow protection / Interior monitor control unit |
| Fuse ATO5A | 50 | Emergency call system control unit |
| Fuse ATO5A | 51 | Antenna amplifier FM1 / AM / KEYLESS-GO |
| Fuse ATO30A | 52 | Front right door control unit |
| Fuse ATO15A | 53 | Ceiling control box |
| Fuse ATO | 54 | Test lead |
| Fuse ATO30A | 55 | Rear compartment systems control unit |
| Fuse ATO15A | 56 | Keyless-Go control unit |
| Fuse ATO30A | 57 | Rear right door control unit |
| Fuse ATO30A | 58 | Transfer box control unit |
| Fuse ATO7.5A | 59 | Supplemental Restraint System (SRS) control unit |
| Fuse ATO7.5A | 60 | Ceiling control box |
| Fuse ATO15A | 62 | AIRMATIC control unit |
| Fuse ATO20A | 63 | Panoramic sliding sunroof control module / Sliding sunroof control module |
| Fuse ATO30A | 64 | Air pump for multi-contour seat |
| Fuse ATO30A | 65 | Fuse box, terminal 30g, front panel |
| Fuse ATO30A | 67 | Electric parking brake control unit |
| Fuse ATO30A | 68 | Electric parking brake control unit |
| Multi fuse block MUSB | MF1-1 | Audio module / COMAND system control panel |
| Multi fuse block MUSB | MF1-2 | Bottom control panel / Off-road driving mode control panel |
| Multi fuse block MUSB | MF1-3 | Parking assistance control unit |
| Multi fuse block MUSB | MF1-4 | Electronic stability control control unit |
| Multi fuse block MUSB | MF1-5 | SAM control unit |
| Multi fuse block MUSB | MF1-6 | Speaker amplifier control unit |
| Multi fuse block MUSB | MF2-1 | HBF control unit |
| Multi fuse block MUSB | MF2-2 | Tire pressure monitoring control unit |
| Multi fuse block MUSB | MF2-3 | Digital audio broadcasting / SDAR control unit |
| Multi fuse block MUSB | MF2-4 | Multi-function camera |
| Multi fuse block MUSB | MF2-5 | Multimedia interface control unit |
| Multi fuse block MUSB | MF2-6 | Rear view camera / 360° camera control box |
| Multi fuse block MUSB | MF3-1 | Rear left display |
| Multi fuse block MUSB | MF3-2 | Rear right display |
| Multi fuse block MUSB | MF3-3 | TV tuner (analog/digital) / Digital TV tuner |
| Multi fuse block MUSB | MF3-4 | DVD player |
| Multi fuse block MUSB | MF3-5 | Video and radar sensors control unit |
Engine Compartment Fuse Box
| Type | No. | Description |
|---|---|---|
| Fuse ATO20A | 202 | Auxiliary heater heater |
| Fuse ATO5A | 203 | Alarm Siren |
| Fuse ATO25A | 204 | Electronic motion stabilization control unit |
| Fuse ATO15A | 205 | Left horn, Right horn |
| Fuse ATO7.5A | 213 | CDI control unit (Engines 642, 651); ME control unit (Engines 157, 276, 278) |
| Fuse ATO15A | 214 | ME/ CDI control unit (engine-dependent); BlueTEC NOx sensor control unit (651) |
| Fuse ATO15A | 215 | Engine/engine compartment plug connection pin 7; radiator shutter actuator (engine-dependent) |
| Fuse ATO15A | 216 | Terminal 87D2 cable termination / CDI control unit / engine mounts / fan motor (engine-dependent) |
| Fuse ATO20A | 217 | Engine compartment plug connection pin 5; CDI control unit (engine-dependent) |
| Fuse ATO10A | 219 | Charge air cooler circulation pump (Engines 278, 157) |
| Fuse ATO7.5A | 229 | Front left headlight |
| Fuse ATO5A | 230 | Electronic stability control control unit |
| Fuse ATO7.5A | 231 | Front right headlight |
| Fuse ATO15A | 232 | Fully integrated gearbox control unit; additional transmission oil pump control unit (without ECO Start-Stop) |
| Fuse ATO15A | 233 | Headlight control unit |
| Fuse ATO5A | 234 | DISTRONIC electronic control module |
| Fuse ATO20A | 235 | Heated wiper blades |
| Fuse MAXI30A | 237 | Servo drive module for automatic transmission (DIRECT SELECT system, KP 722.9) |
| Fuse MAXI40A | 238 | AIRMATIC compressor |
| Fuse ATO30A | 239 | Wiper motor |
| Fuse ATO30A | 240 A | Starter (vehicles without ECO Start-Stop) |
| Fuse ATO30A | 240 B | Engine compartment power fuse box (vehicles with ECO Start-Stop) |
| Battery terminal | CON | Battery connector |
| Relay | J | Horn |
| Relay | K | Wiper mode 1/2 |
| Relay | L | Wiper on/off |
| Relay | M | Starter terminal 50 |
| Relay | N | Electrical circuit terminals 87M |
| Relay | O | Turbocharger |
| Relay | Q | Terminal 15 (no support) |
| Relay | R | Terminal 15 |
| Relay | S | Heated wiper blades |
| Relay | T | AIRMATIC |
