MB M-Class (W166) | 2012-2015

View Mercedes-Benz M-Class (ML) fuse box diagrams for 2012–2015 models with fuse locations, panel layouts, and detailed electrical information for all variants. This article covers the third-generation Mercedes-Benz M-Class (ML) (Model Code: W166), available from 2012 to 2015, and includes fuse box diagrams for Mercedes-Benz ML350, ML400, ML500, ML63 and ML250 CDI (2012, 2013, 2014 and 2015), along with details about the location of the fuse panels inside the vehicle and a clear explanation of the assignment of each fuse (fuse layout).

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Engine Compartment

Fuse Box Location

The fuse box is situated in the engine compartment on the passenger side. To access the fuses, open clamps (2), lift cover (1) in the direction indicated by the arrow, and remove it.

Fuse Box Diagram

Fuses

Assignment of the fuses in the engine compartment

Fuse Data
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No.AmpsDescription
201—–
20220AAuxiliary heater heater
2035AAlarm Siren
20425AElectronic motion stabilization control unit
20515ALeft horn, Right horn
206—–
207—–
208—–
209—–
210—–
211—–
212—–
2137.5AEngines 642, 651: CDI control unit
Engine 157, 276, 278: ME control unit
21415AEngine 157, 276, 278: ME control unit
Engine 651: CDI control unit
BlueTEC: Nox sensor control unit
21515AEngine 157, 276, 278: Electrical plug connection engine/engine compartment (pin 7)
Engine 642: Electrical plug-in connection for motor/engine compartment (pin 7) via terminal 87 D3 cable gland, Radiator shutter actuator
Engine 651: Electrical plug connection engine/engine compartment (pin 7), Radiator shutter actuator
21615AEngine 157, 276, 278: Cable termination, terminal 87D2
Engine 642: CDI control unit, Electrical plug connection engine/engine compartment (pin 6), Adjustable left engine mount, Adjustable right engine mount
Engine 651: Fan motor, CDI control unit, Electrical plug connection engine/engine compartment (pin 6), Adjustable engine mount, left (Y123) Adjustable engine mount, right
21720AEngine 157, 276, 278: Electrical plug connection engine/engine compartment (pin 5)
Engines 642, 651: CDI control unit, Electrical plug connection engine/engine compartment (pin 5)
218—–
21910AEngine 278, 157: Charge air cooler circulation pump
220—–
221—–
222—–
223—–
224—–
225—–
226—–
227—–
228—–
2297.5AFront left headlight
2305AControl unit for electronic stability control
2317.5AFront right headlight
23215AFully integrated gearbox control unit
Vehicles without “ECO Start-Stop” function: Additional transmission oil pump control unit
23315AHeadlight control unit
2345AElectrical control module DISTRONIC
23520AHeated wiper blades
236—–
23730AKP 722.9: Servo drive module for automatic transmission for DIRECT SELECT system
23840ACompressor AIRMATIC
23930AWiper motor
240A30AStarter (Vehicles without “ECO Start-Stop” function)
240B30AEngine compartment power fuse box (Vehicles with “ECO Start-Stop” function)
241—–

Relays

Assignment of the relays in the engine compartment

Fuse Data
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No.Description
R1Horn
R2AIRMATIC
R3Wiper mode 1/2
R4Heated wiper blades
R5Wiper on/off
R6Terminal 15
R7Starter terminal 50
R8Terminal 15 (no support)
R9El. circuit terminals 87M
R10–
R11Turbocharger

Dashboard

Fuse Box Location

The fuse box is situated in the passenger compartment at the edge of the dashboard on the passenger side. To access the fuses, pull cover (1) outward in the direction indicated by the arrow, then remove it.

Fuse Box Diagram

Fuses

Assignment of the fuses in the passenger compartment (Dashboard)

Fuse Data
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No.AmpsDescription
107.5AElectronic ignition lock control unit
1110ASteering column electronic module control unit
125AInstrument cluster
1315AAuxiliary fan electronic control
145ADiagnostic connector
155AUpper control box
16—–
17—–
18—–
1915AClimate Control Panel
205ASteering column electronic module control unit
217.5AAudio/ COMAND display
22—–

Battery Compartment

Fuse Box Location

The fuse box is positioned beneath the front passenger seat, in the compartment beside the battery. For easier access, slide the seat fully forward and fold it down.

Fuse Box Diagram

Fuses

Assignment of the fuses in the battery compartment

Fuse Data
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No.AmpsDescription
3040ASpeaker amplifier control unit
3030AWoofer Amplifier
3140AEngine compartment fuse and relay module
3240AFan regulator
3340AFront left reversible seat belt pretensioner
3440ARear fuse box
3540AFront right seat belt reversible pretensioner
3640AFuse box, terminal 30, front panel
3740ATest lead
4025AElectronic rear air conditioning fan control
455ADigital tachograph control unit
4710ASpeaker amplifier control unit
4830ARear compartment systems control unit
495AEDW/Tow protection/Interior monitor control unit
505AEmergency call system control unit
515AAntenna amplifier FM 1, AM, ZV and KEYLESS-GO
5230AFront right door control unit
5315ACeiling control box
54Test lead
5530ARear compartment systems control unit
5615AKeyLess-Go control unit
5730ARear right door control unit
5830ATransfer box control unit
597.5AControl unit for passenger restraint system (Supplemental Restraint System)
607.5ACeiling control box
6215AAIRMATIC control unit
6320APanoramic sliding sunroof control module, Sliding sunroof control module
6430AAir pump for multi-contour seat
6530AFuse box, terminal 30g, front panel
6730AElectric parking brake control unit
6830AElectric parking brake control unit
MF1-1Audio module/COMAND system control panel
MF1-2Bottom Control Panel, Off-road driving mode control panel
MF1-3Parking assistance control unit
MF1-4Control unit for electronic stability control
MF1-5SAM control unit
MF1-6Speaker amplifier control unit
MF2-1HBF control unit
MF2-2Tire pressure monitoring control unit
MF2-3Digital audio broadcasting control unit, Satellite Digital Audio Radio (SDAR) control unit
MF2-4Multi-function camera
MF2-5Multimedia interface control unit
MF2-6Rear View Camera, 360° camera control box
MF3-1Rear left display
MF3-2Rear right display
MF3-3TV tuner (analog/digital), Digital TV tuner
MF3-4DVD player
MF3-5Control unit for video and radar sensors

Rear Compartment

Fuse Box Location

It is positioned beneath the right rear bench seat. Fold the right-hand rear bench seat forward, then lift and fold back the carpet (1) in the direction shown by the arrow. Press the clamps (2) in the arrow’s direction to release them. Fold the cover (3) upward as indicated and remove it.

Fuse Box Diagram

Fuses

Assignment of the fuses in the rear compartment

Fuse Data
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No.AmpsDescription
1005AAudio module, COMAND control module, Electrical plug connection for external navigation
10120ATrailer detection control unit
1027.5ADriver’s seat control unit
1037.5AFront passenger seat control unit
1045AAntenna Amplifier / Mobile Phone Compensator, Bluetooth module
1055AHolder for navigation module
1065ATailgate control unit
10710ARelease module, 2nd row of seats, left; Release module, 2nd row of seats, right
108—–
109—–
1105AAdBlue control unit
11115ATrailer socket
1125AFuel pump control unit
1135AElectric parking brake control unit
1145ASwitch for exterior lighting
1155ATrailer detection control unit
1165ATermination of terminal 87 of the radar control unit, Collision Prevention Assist control module
1175ANight vision control unit
118—–
1195ATransfer case control unit
1205AFuel quality sensor, Digital tachograph control unit
121—–
122—–
123—–
12430AElectrical plug connection for the Electric Brake Control function
125—–
12615ATrailer recognition control unit
12730ADriver seat control unit
12820ATrailer recognition control unit
12930AFront passenger seat control unit
13020ATrailer recognition control unit
131—–
13225AFuel pump control unit
1335ARadio remote control receiver for auxiliary heater
1345ASeat occupied recognition pressure sensor, Occupancy recognition and AKSE, front passenger seat
1355AGlove box light
1367.5AControl unit for passenger restraint system (Supplemental Restraint System)
1375AElectric fuse preparation for installation of the Electronic Toll Collection system, Electronic equipment rear view camera, Electrical plug connection for external navigation
13815AActive roll stabilization control unit
139—–
1407.5AAdBlue control unit
14115AAdBlue control unit
14220AAdBlue control unit
143—–
144—–
1457.5ACup holder
14630ARear window notch filter
14730AAudio module, COMAND control module
14815ACigarette lighter heating element, Detachable cup holder connection
1495ASocket 115 V
15020ASocket in trunk
15120ASocket, 2nd seat row, left; Socket in the 2nd row of seats on the right
15230ARear compartment systems control unit
15325AAC/DC converter control unit
15440ATailgate control unit
155—–
156—–
15715ATailgate wiper motor

Relays

Assignment of the relays in the rear compartment

Fuse Data
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No.Description
R1Backup
R2Backup
R3Terminal 15R1
R4Rear window wiper
R5Terminal 15
R6AdBlue
R7Backup
R8Heated rear window
R9Socket terminals 15R2

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