Fuses and relays Mercedes B-Class (W246 / T242, 2011- 2019)

This material discusses in detail the fuse diagrams of a Mercedes B-class car (second generation / factory index W246 / T242): 2011  , 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019  with the designations B160, B180 CDI, B200 , B220 4MATIC, B250.

Fuses numbered 70, 71 and 72 in the cabin block are responsible for protecting the electrical circuits of the cigarette lighters.

In the engine compartment


The block is located on the left side of the engine compartment. It consists of two parts: power fuses and the main fuse panel.

Power fuse links

Located on the side of the main unit.


General form.

Diagram
No. Description Amps
F32k1 Decoupling relay (F32k1)
F1 Generator 300A /
Electric Drive (W242): DC voltage converter control unit 400A 
300 / 400
F2 Electric Drive (W242), and petrol 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


Photo is an example.

Diagram
No. Description Amps
J Horn 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
  • Electric Drive (W242): Terminal 87 relay of the parking lock control unit
  • Transmission oil coolant circulation pump relay
P Spare
Q
  • Electric Drive (W242): Brake booster vacuum pump power relay
  • Terminal 15 relay (unprotected)
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 electronic motion stabilization system 25
205 Left and right beep 15
206 engine 651: CDI control unit 5
Electric Drive (W242): Transmission Control Unit, Brake Booster Vacuum Pump Relay, El. circuit terminals 87M
207 diesel: Relay el. circuit terminals 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 electr. terminal circuits 87M3 (motors 133, 270) 15
engine 651: EGR cooler bypass changeover valve, heating element for ventilation line and coolant thermostat
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: Dosing valve
Engine 607: Metering valve, Boost pressure control servo, CDI control unit
Electric Drive (W242): Thermal Control Unit, Transmission Gateway Control Unit / High Voltage Power Distributor (as of 03/11/2014) 5
216 petrol engines: ME control unit 5
engine 607: transmission control unit
217 gearbox 724: Control unit for fully integrated dual clutch gearbox control system 25
218 Control unit for electronic motion 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 electronic motion 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


The fuse box is located behind the floor trim at the feet of the front passenger.


General form.

Diagram
No. Purpose Amps
A Relay terminal 15
B Rear window wiper relay
C Relay terminal 15R2
D Heated rear window 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
  • from 03.11.2014 - Trailer detection control unit
  • to 02.11.2014 - trailer socket
15
30 Trailer detection control module 5
31 AWD control module 5
32 Signals from the steering column electronic 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 seat belt pretensioner 40
45 Reversible front right seat belt pretensioner 40
46 Front passenger seat control unit 7.5
47 Navigation module 7.5
Control unit for adaptive damping system 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
Terminal 87 relay Park lock actuator 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 light 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/Tow protection/Interior monitor control unit 5
86 Antenna amplifier FM, AM and ZV 5
87 Diagnostic connector 10
88 instrument cluster 10
89 Outdoor lighting switch 5
90 Intelligent radar sensor in rear bumper left and right 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 and AKSE, Weight Sensing System control unit 7.5
96 Tailgate wiper motor 15
97 Mobile phone electrical plug 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 Remote radio remote control receiver for auxiliary 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 Communication module for telecommunications services, HERMES control unit, Emergency call system control unit 5
104 Device connection multimedia interface control unit 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 connection socket outlet for cargo 20
110 COMAND control module, Motorsound control unit, Audio module 30
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