Mercedes-Benz B-Class W242, W246 (2012-2018) – fuse box
Mercedes-Benz B-Class w242, w246 (2012-2018) – fuse box diagram
Year of production: 2012, 2013, 2014, 2015, 2016, 2017, 2018.
The cigarette lighter fuse (power socket) on the Mercedes B-Class w242, w246 (2012-2018) is fuse 72 in the fuse box (passenger footwell ).
Fuse box in the engine compartment
| Number | Description | Amperes [A] |
| 201 | Alarm siren | 5 |
| 202 | Stationary heater control unit | 20 |
| Electric Drive (W242):
Circuit 87 of parking pawl control unit relay. |
5 | |
| 203 | LED headlight:
right front headlight. |
15 |
| Electric Drive (W242):
Powertrain control unit |
5 | |
| 204 | Electronic stability program control unit | 25 |
| 205 | Left horn;
Right horn. |
15 |
| 206 | Valid for engine 651:
CDI control unit Valid for engine 607: Powertrain control unit; Electric Drive (W242): Brake booster vacuum pump relay; 87M circuit relay. |
5 |
| 207 | Valid for diesel engine:
87M circuit relay Electric Drive (W242): High voltage battery cooling shut-off valve Parking pawl control unit |
5 |
| 208 | Valid for engine 133, 607:
Circuit relay 87 |
7.5 |
| Electric Drive (W242):
Fan motor |
5 | |
| 209 | LED headlight:
Left front headlight |
15 |
| Electric Drive (W242):
Reserve |
– | |
| 210 | Heated windshield relay | 5 |
| from 03/11/2014 with the exception of (Canadian version):
Starter front relay |
5 | |
| 211 | Natural Gas Drive (W242):
CNG control unit |
7.5 |
| Electric Drive (W242):
Circulation pump for the heating circuit |
15 | |
| 212 | Valid for engine 133, 270:
Jointing sleeve, circumference 87M3; Valid for engine 651: Heating element of the deaeration hose; Coolant thermostat heating element; Exhaust gas recirculation cooler bypass diverting valve; Valid for engine 607 (EU5 emission standard): Oxygen sensor in front of the catalyst; Boost pressure positioner positioner; Valid for engine 607 (EU6 emission standard): Oxygen sensor in front of the catalyst; Valid for engine 607: CDI control unit; Electric Drive (W242): Electric drive and supercharged coolant pump . |
15 |
| 213 | Valid for engines 133, 270, 651:
Connecting sleeve, circuit 87 M2e Valid for engine 607 (EU5 emission standard): Camshaft; Hall sensor; CDI control unit; Quantity control valve ; Valid for engine 607 (EU6 emission standard): Oxygen sensor after catalytic converter; CDI control unit; Electric Drive (W242): Battery cooling system coolant pump 1. |
15 |
| 214 | Valid for engines 133, 270, 651:
Connecting sleeve, circumference 87 M4e |
10 |
| Electric Drive (W242):
Coolant pump for battery cooling system 2 |
15 | |
| 215 | Valid for gasoline engine:
Cylinder 1 ignition coil; Cylinder 2 ignition coil; Cylinder 3 ignition coil; Cylinder 4 ignition coil; Valid for engine 651: Quantity control valve; Valid for engine 607: CDI control unit; Boost pressure regulator ; Quantity control valve. |
20 |
| Electric Drive (W242):
Temperature management control unit; Gateway powertrain control unit; Electric drive (W242) from 03/11/2014: High voltage distributor. |
5 | |
| 216 | Valid for gasoline engine:
ME-SFI control unit; Valid for engine 607: Powertrain control unit. |
5 |
| 217 | Valid with the 724 gearbox:
The fully integrated control unit transmission gearbox with double clutch. |
25 |
| 218 | Electronic stability program control unit | 5 |
| 219 | Electric Drive (W242):
Parking pawl control unit. |
5 |
| 220 | Gear coolant circulation pump | 10 |
| 221 | Electric Drive (W242):
Vacuum pump |
40 |
| 222 | Electric Drive (W242):
Electric refrigerant compressor |
7.5 |
| 223 | Reserve | – |
| 224 | Electric controller DISTRONIC;
COLLISION PREVENTION ASSIST control unit. |
7.5 |
| 225 | Electric Drive (W242):
Powertrain control unit. |
5 |
| 226 | Natural Gas Drive (W242):
CNG control unit; Electric Drive (W242): Charger control unit; Power electronics control unit. |
5 |
| 227 | Electric Drive (W242):
Power electronics control unit. |
5 |
| 228 | Electric Drive (W242):
Electric vehicle sound generator |
5 |
| 229 | Left Headlight Assembly | 5 |
| 230 | Electronic stability program control unit | 5 |
| 231 | Right headlight assembly | 5 |
| 232 | Headlamp control unit | 15 |
| 233 | Reserve | – |
| 234 | Valid for engine 607:
Powertrain control unit |
5 |
| Electric Drive (W242):
High voltage current splitter |
10 | |
| 235 | Valid for engine 607:
Fan motor; Radiator shutter actuator. |
7.5 |
| Valid for engine 133:
Charge air cooler circulation pump; Charge air cooler circulation pump. |
7.5 | |
| 236 | SAM control unit | 40 |
| 237 | Electronic stability program control unit | 40 |
| 238 | Heated windscreen | 50 |
| 239 | Wiper speed relay 1/2 | 30 |
| 240A | Starter relay 50 | 25 |
| Electric Drive (W242):
Powertrain control unit |
7.5 | |
| 240B | Circuit 15 of Relay (Not Latched) | 25 |
| 241 | Electric Drive (W242):
High voltage PTC heater |
7.5 |
| Relay | ||
| J. | Fanfare horn relay | |
| K. | Wiper speed relay 1/2 | |
| L | Windshield wiper on / off relay | |
| M. | Starter circuit 50 of the relay;
Electric Drive (W242): Circuit 87C relay. |
|
| N | Circuit Relay 87M. | |
| O | ECO start / stop:
Transmission coolant circulation pump relay; Electric Drive (W242): Circuit 87 of the parking pawl control unit relay . |
|
| P. | Backup relay (F58kP) | |
| Q | Relay Circuit 15 (Not Stopped);
Electric Drive (W242): Brake booster vacuum pump power relay (F58kQ). |
|
| R | Circuit 15 relay | |
| S | Circuit 87 of the relay | |
| T. | Heated windshield relay | |
Fuse box in the passenger footwell
| Number | Description | Amperes [A] |
| 21 | Valid for diesel engine:
PTC heater amplifier |
150 |
| 22 | Additional battery relay for the ECO start / stop function | 200 |
| 23 | Left front door control unit | 30 |
| 24 | Right front door control unit | 30 |
| 25 | SAM control unit | 30 |
| 26 | Additional ECO start / stop battery connector sleeve | 10 |
| 27 | Engine compartment fuse and relay module | 30 |
| 28 | Interior sound generator control unit;
Electric Drive (W242): Temperature management control unit. |
5 |
| 29 | until 02/11/2014:
Trailer socket; As of November 3, 2014: Trailer recognition control unit. |
15 |
| 30 | Trailer recognition control unit | 5 |
| 31 | 4MATIC:
All-wheel drive controller |
5 |
| 32 | Steering wheel lamp module control unit | 5 |
| 33 | Audio / COMAND control panel | 5 |
| 34 | ACC control and operating unit | 7.5 |
| 35 | Rear window heating | 40 |
| 36 | Driver seat control unit;
Driver’s seat lumbar support adjustment control unit. |
7.5 |
| 37 | Audio / COMAND display | 7.5 |
| 38 | Supplemental restraint system control unit | 7.5 |
| 39 | Suspended control panel control unit | 10 |
| 40 | Valid for engine 651 (EU6 emission standard):
Powertrain control unit |
15 |
| Electric Drive (W242):
Powertrain control unit |
5 | |
| 41 | Panoramic sliding sunroof control module | 30 |
| 42 | Radio (Audio 5 USB, Audio 20 CD, Audio 20 CD with CD changer);
COMAND control unit. |
5 |
| Radio (Radio 20, Audio 20 USB) | 25 | |
| 43 | Parking system control unit | 5 |
| 44 | Front left reversible emergency tensioner | 40 |
| 45 | Right front reversible emergency tensioner | 40 |
| 46 | Front passenger seat control unit;
Control unit for adjusting the lumbar support for the passenger seat. |
7.5 |
| 47 | Navigation module | 7.5 |
| Adaptive damping system control unit | 25 | |
| 48 | Reserve | – |
| 49 | Control unit for Drive Kit for iPhone ® | 7.5 |
| COMAND fan motor | 5 | |
| 50 | Reserve | – |
| 51 | Reserve | – |
| 52 | Electric Drive (W242):
Parking pawl actuator motor |
30 |
| 53 | Reserve | – |
| 54 | Reserve | – |
| 55 | Telematics services communication module;
KEYLESS-GO control unit. |
5 |
| 56 | Steering wheel lamp module control unit | 10 |
| 57 | Lane keeping assistant:
Special purpose vehicle multifunction control unit |
30 |
| Special vehicle:
Special purpose vehicle multifunction control unit |
7.5 | |
| Electric Drive (W242):
Parking Latch Actuator Motor Circuit 87 Relay (F34kG) |
5 | |
| 58 | Emergency vehicle fuse box | 30 |
| 59 | Front passenger seat control, uni | 30 |
| 60 | Driver seat control unit | 30 |
| 61 | Sound system amplifier control unit | 40 |
| 62 | Valid for gearbox 711:
Electric steering lock |
20 |
| 63 | Fuel system control unit | 25 |
| Electric Drive (W242):
Drive unit control gate |
5 | |
| 64 | Electronic toll collection control unit;
Dedicated control unit for short-range communications. |
1 |
| 65 | Lamp in the glove box | 5 |
| 66 | Emergency vehicle fuse box | 15 |
| Special purpose vehicle interface | 5 | |
| 67 | Reserve | – |
| 68 | Reserve | – |
| 69 | Reserve | – |
| 70 | Rear center console socket | 25 |
| 71 | Trunk socket | 25 |
| 72 | Front cigarette lighter with ashtray lighting;
Vehicle interior power socket. |
25 |
| 73 | Electric parking brake control unit | 30 |
| 74 | Electric parking brake control unit | 30 |
| 75 | Trailer recognition control unit | 20 |
| Electric Drive (W242):
Battery management system control unit (N82 / 2) |
5 | |
| 76 | Trailer recognition control unit (N28 / 1) | 25 |
| Electric Drive (W242):
Parking pawl control unit |
5 | |
| 77 | Trailer recognition control unit | 25 |
| 78 | Emergency vehicle fuse box | 40 |
| 79 | SAM control unit | 40 |
| 80 | SAM control unit | 40 |
| 81 | Blower regulator | 40 |
| 82 | Suspended control panel control unit | 10 |
| 83 | Electronic ignition lock control unit | 7.5 |
| 84 | Top control panel control unit | 5 |
| 85 | ATA [EDW] / towing protection / interior guarding control unit | 5 |
| 86 | FM, AM and CL [ZV] antenna amplifier;
from 01/06/2016: Antenna amplifier / compensator for a cellular telephone system. |
5 |
| 87 | Diagnostic connector | 10 |
| 88 | Instrument cluster | 10 |
| 89 | Exterior lights switch | 5 |
| 90 | Left rear bumper smart radar sensor;
Smart radar sensor for the right rear bumper. |
5 |
| 91 | Pedal operation monitor switch;
Footwell lighting switch ; Electric Drive (W242): Battery management system control unit. |
5 |
| 92 | Fuel system control unit;
Electric Drive (W242): Gate drive unit control unit. |
5 |
| 93 | Electric parking brake control unit | 5 |
| 94 | Supplemental restraint system control unit | 7.5 |
| 95 | Front passenger seat occupancy recognition,
ACSR weight detection system (WSS) control unit |
7.5 |
| 96 | Tailgate Wiper Motor | 15 |
| 97 | Mobile phone electrical connector | 5 |
| 98 | SAM control unit | 5 |
| 99 | Tire pressure monitor control unit | 5 |
| 100 | Valid for engine 133:
DIRECT SELECT INTERFACE |
5 |
| 101 | 4MATIC:
All-wheel drive controller |
10 |
| 102 | Stationary heater remote control receiver;
Electric Drive (W242): Powertrain control unit; Valid for AMG vehicles from 01/09/2015: Transmission mode control unit; from 01/06/2016: Antenna switch for telephone and stationary heater. |
5 |
| 103 | Emergency call system control unit;
Telematics services communication module; HERMES control unit. |
5 |
| 104 | Multimedia interface control unit;
Multimedia connection unit. |
5 |
| 105 | Digital Audio Broadcasting control unit;
Satellite digital audio radio (SDAR) control unit. |
5 |
| Tuner module | 7.5 | |
| 106 | Multifunctional camera | 5 |
| 107 | Digital TV tuner | 5 |
| 108 | until May 31, 2016:
Reversing camera |
5 |
| from 01/06/2016:
Reversing camera |
7.5 | |
| 109 | Charging socket electrical connector | 20 |
| 110 | COMAND radio control;
Engine sound driver. |
30 |
| Relay | ||
| A | Circuit 15 relay | |
| B | Rear window wiper relay | |
| C. | Relay circuit 15R2 | |
| D | Heated rear window relay | |
| E. | Circuit 15R1 of the relay | |
| F. | Relay circuit 30g | |
| G. | Electric Drive (W242):
Circuit 87 of parking pawl actuator motor relay |
|
Front electric fuse box
| Number | Description | Amperes [A] |
| 1 | Alternator | 300 |
| Electric Drive (W242):
DC / DC converter control unit |
400 | |
| 2 | Fuse box inside the vehicle | 200 |
| Valid for diesel engine:
Vehicle interior fuse box |
250 | |
| 3 | Electric power steering control unit | 100 |
| 4 | SAM control unit | 40 |
| 5 | Fan motor | 80 |
| 6 | Valid for engine 607:
Fuel heating control unit |
70 |
| 7 | Valid for engine 607 (EU5 emission standard):
DPF regeneration heater booster control unit |
125 |
| 8 | Valid for engines 607, 651:
Glow output stage |
100 |
| Relay | ||
| F32k1 | Decoupling relay | |