Table of Contents
Mercedes-Benz B-Class is a series of compact cars by the German automaker. It was first introduced in 2005 at the Geneva Motor Show, and was preceded by the Vision B concept car. It is produced in Rastatt. In this article, we will take a detailed look at the fuse box diagrams for the Mercedes B-Class (second generation; factory index W246 / T242) 2011, 2012, 2013, 2014, 2014, 2015, 2016, 2017, 2018, 2019 years of manufacture with designations B160, B180 CDI, B200, B220 4MATIC, B250.
Here you will find the locations and photos of distribution boxes. The fuses responsible for the “Cigarette lighter” and “Fuel Pump” are highlighted in bold.
In the engine compartment
The distribution box is located on the left side of the underhood. It consists of two parts: the power fuses and the main fuse panel.
Power fusible links
Located on the side of the main unit.
General view.
| Diagram | ||
|---|---|---|
|
||
| No. | Description | Amps |
| F32k1 | Decoupling relay (F32k1) | |
| F1 | Alternator 300A / Electric Drive (W242): 400A DC voltage converter control unit |
300 / 400 |
| F2 | Electric Drive (W242), and gasoline vehicles: Interior fuse box | 200 |
| diesel engines: Interior fuse box | 250 | |
| F3 | Electric power steering control module | 100 |
| F4 | SAM management module | 40 |
| F5 | Fan motor | 80 |
| F6 | engine 607 - fuel heating control unit | 70 |
| F7 | engine 607 - DPF regeneration auxiliary heater control unit | 125 |
| F8 | engines: 651, 607 - Glow plug output stage module | 100 |
Fuse box
The photo shows an example.
| Diagram | ||
|---|---|---|
|
||
| No. | Description | Amps |
| J | Horn (beep) relay | |
| K | Wiper speed relay 1/2 | |
| L | Wiper relay on/off | |
| M | Starter terminal 50 relay | |
| Electric Drive (W242): Relay terminal 87C | ||
| N | Relay terminal 87M | |
| O |
|
|
| P | Spare | |
| Q |
|
|
| R | Relay terminal 15 | |
| S | Relay terminal 87 | |
| T | Heated windshield relay | |
| 201 | alarm siren | 5 |
| 202 | Auxiliary heater control unit | 20 |
| Electric Drive (W242): Terminal 87 relay of the parking lock control unit | 5 | |
| 203 | Front right headlight | 15 |
| Electric Drive (W242): Transmission control unit | 5 | |
| 204 | Control unit for the electronic traffic stabilization system | 25 |
| 205 | Left and right horn (beep) | 15 |
| 206 | engine 651: CDI control unit | 5 |
| Electric Drive (W242): Transmission control unit, Brake drive booster vacuum pump relay, Electric drive relay terminal 87M circuit relay | ||
| 207 | Diesel: Relay of the electric circuit terminal 87M | 5 |
| Electric Drive (W242): HV Battery Cooling Shutoff Valve, Parking Lock Control Unit | ||
| 208 | motors: 133, 607 - Relay terminal 87 | 7.5 |
| Electric Drive (W242): Fan motor | 5 | |
| 209 | Front left headlight | 15 |
| Electric Drive (W242): Not used | ||
| 210 | Heated front window relay | 5 |
| from 03.11.2014 - Starter Pre Relay | ||
| 211 | 242.848 - CNG control unit | 7.5 |
| Electric Drive (W242): Heating circuit circulation pump | 15 | |
| 212 | motors 133, 270: Cable lug electrical circuit terminal 87M3 | 15 |
| engine 651: Exhaust gas recirculation cooler bypass switch valve, Cooling system vent pipe and thermostat heating element | ||
| engine 607: CDI control unit, boost pressure control servo, lambda probe before catalytic converter | ||
| Electric Drive (W242): Electric drive and charger coolant pump | ||
| 213 | motors 133, 270, 651: Terminal 87 cable termination | 15 |
| engine 607: Lambda probe after catalytic converter, CDI control unit, Dosing valve, Camshaft Hall sensor | ||
| Electric Drive (W242): Coolant pump 1 for battery cooling | ||
| 214 | motors 133, 270, 651: Terminal 87 cable termination | 10 |
| Electric Drive (W242): Coolant pump 2 for battery cooling | 15 | |
| 215 | gasoline engines: Ignition coil cylinders 1 / 2 / 3 / 4 | 20 |
| engine 651: Dispense valve | ||
| Engine 607: Metering valve, Boost pressure control servo, CDI control unit | ||
| Electric Drive (W242): Thermal Management Unit, Transmission Gateway Control Unit / High Voltage Power Distribution Unit (from 03.11.2014) | 5 | |
| 216 | gasoline engines: ME control unit | 5 |
| engine 607: transmission control unit | ||
| 217 | gearbox 724: Control unit for the fully integrated dual clutch gearbox control system | 25 |
| 218 | Control unit for the electronic traffic stabilization system | 5 |
| 219 | Electric Drive (W242): Parking lock control unit | 5 |
| 220 | Circulation pump for gearbox oil cooling system (gearbox 724) | 10 |
| 221 | Electric Drive (W242): Vacuum pump | 40 |
| 222 | Electric Drive (W242): Electric A/C Compressor | 7.5 |
| 223 | Not involved | - |
| 224 | Electrical control module DISTRONIC | 7.5 |
| COLLISION PREVENTION ASSIST control module | ||
| 225 | Electric Drive (W242): Transmission control unit | 5 |
| 226 | 242.848: CNG control unit | 5 |
| Electric Drive (W242): Power Electronics Control Unit, Charger Control Unit | ||
| 227 | Electric Drive (W242): Power electronics control unit | 5 |
| 228 | Electric Drive (W242): Electric Vehicle Sound Generator | 5 |
| 229 | Front left headlight | 5 |
| 230 | Control unit for electronic motion stabilization system | 5 |
| 231 | Front right headlight | 5 |
| 232 | headlight control unit | 15 |
| 233 | Not involved | - |
| 234 | engine 607: transmission control unit | 5 |
| Electric Drive (W242): High voltage power distributor | 10 | |
| 235 | Engine 607: Radiator Shutter Actuator, Fan Motor | 7.5 |
| engine 133: charge air cooler circulation pump | ||
| 236 | SAM control unit | 40 |
| 237 | Control unit for the electronic traffic stabilization system | 40 |
| 238 | Heated windshield | 50 |
| 239 | Wiper Mode Relay 1/2 | 30 |
| 240A | Starter terminal 50 relay | 25 |
| Electric Drive (W242): Transmission control unit | 7.5 | |
| 240B | Terminal 15 relay (no support) | 25 |
| 241 | Electric Drive (W242): High voltage electric heater system | 7.5 |
In the cabin
Located behind the floor trim in the front passenger's feet.
General view of the Mercedes W246 / T242 cabin fuse box.
| Diagram | ||
|---|---|---|
|
||
| No. | Purpose | Amps |
| A | Relay terminal 15 | |
| B | Rear window wiper relay | |
| C | Relay terminal 15R2 | |
| D | Rear window heater relay | |
| E | Relay terminal 15R1 | |
| F | Relay terminal 30g | |
| G | Electric Drive (W242): Terminal 87 relay / Park lock actuator | |
| 21 | Additional electric heater (vehicles with diesel engine) | 150 |
| 22 | Additional battery relay for ECO Start-Stop function | 200 |
| 23 | Front left door control module | 30 |
| 24 | Front Right Door Control Module | 30 |
| 25 | SAM management module | 30 |
| 26 | Additional battery cable termination for “ECO Start-Stop” function | 10 |
| 27 | Engine Compartment Fuse and Relay Box | 30 |
| 28 | Electric Drive (W242): Thermal management unit | 5 |
| 29 |
|
15 |
| 30 | Trailer detection control module | 5 |
| 31 | AWD control module | 5 |
| 32 | Signals from the electronic steering column module control unit | 5 |
| 33 | Audio module / COMAND system control panel | 5 |
| 34 | Control panel for climate control system | 7.5 |
| 35 | Rear window heating | 40 |
| 36 | Driver's seat control unit / Lumbar support adjustment control unit for driver's seat | 7.5 |
| 37 | Audio module / COMAND system display | 7.5 |
| 38 | Control unit for passenger restraint system (Supplemental Restraint System) | 7.5 |
| 39 | Ceiling Control Panel | 10 |
| 40 | engine 651 - Transmission control unit | 15 |
| Electric Drive (W242): Transmission control unit | 5 | |
| 41 | Panoramic sliding sunroof control module | 30 |
| 42 | COMAND control module / Audio module | 5 |
| Audio module | 25 | |
| 43 | Parking assistance control unit | 5 |
| 44 | Reversible front left seatbelt tensioner | 40 |
| 45 | Reversible front right seatbelt tensioner | 40 |
| 46 | Front passenger seat control unit | 7.5 |
| 47 | Navigation module | 7.5 |
| Adaptive damping system control unit | 25 | |
| 48 | Not involved | - |
| 49 | Drive Kit Control Unit for iPhone | 7.5 |
| COMAND fan motor | 5 | |
| 50 | Camera Cover Control Unit | 5 |
| 51 | Not involved | - |
| 52 | Parking lock actuator signal | 30 |
| 53 | Not involved | - |
| 54 | Not involved | - |
| 55 | KEYLESS-GO Control Unit, Telecommunication Services Communication Module | 5 |
| 56 | Signals from the steering column electronic module control unit | 10 |
| 57 | Multifunction control unit for special vehicle | 30 |
| Multifunction control unit for special vehicle | 7.5 | |
| Relay terminal 87 parking interlock actuator motor | 5 | |
| 58 | Special Vehicle Fuse Box | 30 |
| 59 | Front Passenger Seat Control Module | 30 |
| 60 | Driver seat control module | 30 |
| 61 | Speaker amplifier control module | 40 |
| 62 | Electric Steering Lock Control Module (711 Transmission) | 20 |
| 63 | Fuel pump control module | 25 |
| Electric Drive (W242): Transmission Interface Control Unit | 5 | |
| 64 | DSRC Toll Communication Control Unit, “Electronic Toll Collection” Control Unit | |
| 65 | Glove box lighting | 5 |
| 66 | Special Vehicle Fuse Box | 15 |
| Special vehicle interface | 5 | |
| 67 | Not involved | - |
| 68 | Not involved | - |
| 69 | Not involved | - |
| 70 | Cigarette lighter socket in the rear | 25 |
| 71 | Cigarette lighter socket in trunk | 25 |
| 72 | Front cigarette lighter socket with illuminated ashtray Mercedes B-Class W246 / T242 | 25 |
| 73 | Electric parking brake control unit | 30 |
| 74 | Electric parking brake control unit | 30 |
| 75 | Trailer detection control unit | 20 |
| Electric Drive (W242): Battery management system control unit | 5 | |
| 76 | Trailer detection control unit | 25 |
| Electric Drive (W242): Parking lock control unit | 5 | |
| 77 | Trailer detection control unit | 25 |
| 78 | Trunk Lid/Tailgate Control Module, Special Purpose Vehicle Fuse Box | 40 |
| 79 | SAM management module | 40 |
| 80 | SAM management module | 40 |
| 81 | Fan controller | 40 |
| 82 | Ceiling Control Panel | 10 |
| 83 | Electronic ignition lock control unit | 7.5 |
| 84 | Upper block control panel | 5 |
| 85 | EDW / towing protection / interior security system control unit | 5 |
| 86 | Antenna amplifier FM, AM | 5 |
| 87 | Diagnostic connector | 10 |
| 88 | instrument cluster | 10 |
| 89 | Outdoor lighting switch | 5 |
| 90 | Intelligent radar sensor in left and right rear bumper | 5 |
| 91 | Pedal Sensor, Footwell Light Switch | 5 |
| Electric Drive (W242): Battery management system control unit | ||
| 92 | Fuel pump control unit (fuel pump fuse) | 5 |
| Electric Drive (W242): Transmission Interface Control Unit | ||
| 93 | Electric parking brake control unit | 5 |
| 94 | Passenger restraint system (SRS) control unit | 7.5 |
| 95 | Front Passenger Seat Occupancy Recognition System, Weight Sensing System Control Unit | 7.5 |
| 96 | Tailgate wiper motor | 15 |
| 97 | Cell phone electrical plug connection | 5 |
| 98 | SAM control unit | 5 |
| 99 | Tire pressure monitoring control unit | 5 |
| 100 | DIRECT SELECT interface (engine 133) | 5 |
| 101 | All-wheel drive control unit | 10 |
| 102 | Receiver of the radio remote control of the autonomous heater | 5 |
| Electric Drive (W242) - Transmission control unit | ||
| AMG, from 09/01/2015 - Drive mode control unit | ||
| from 06/01/2016 - Antenna switch for telephone and auxiliary heater | ||
| 103 | Telecommunication Services Communication Module, HERMES Control Unit, Emergency Call System Control Unit | 5 |
| 104 | Multimedia interface control unit for connecting devices | 5 |
| 105 | Satellite Digital Audio Radio (SDAR) Control Unit, Digital Audio Broadcasting Control Unit | 5 |
| tuner module | 7.5 | |
| 106 | Multifunction camera | 5 |
| 107 | Digital TV tuner | 5 |
| 108 | Rear View Camera | 5 |
| Rear view camera (from 06/01/2016) | 7.5 | |
| 109 | Electrical plug socket connection in the luggage compartment | 20 |
| 110 | COMAND control module, Motorsound control unit, Audio module | 30 |
