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 ).

READ:  Mercedes-Benz ML W164 (2005-2011) - fuse box

Fuse box in the engine compartment

Mercedes-Benz B-Class w242, w246 – fuse box diagram – 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

Mercedes-Benz B-Class w242, w246 – fuse diagram – 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

Mercedes-Benz B-Class w242, w246 – fuse box diagram – front electric box
Mercedes-Benz B-Class w242, w246 – fuse box diagram – front electric 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

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