Fuses and relays Mercedes B-Class (W245; 2005 - 2012)

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 understand in detail fuse box diagrams Mercedes W245 B-Class (1st gen; B160, B170, B180, B200) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 years of manufacture

general view of the car
Here you will find the locations and photos of the mounting blocks. Also, we will separately mark the fuses responsible for the cigarette lighter and the fuel pump.

In the passenger compartment

Here there are two units responsible for the protection of the vehicle's electrical circuits.

Fuse box

Location of the fuse box in the passenger compartment
It is located in the front passenger footwell. It can be accessed by removing the floor pan.


General view of the Mercedes B-Class W245 cabin fuse box.

Diagram
No. A Description
1 10 2005-2008:  Brake light switch
5 2008-2012 and 2005-2008 with code U58:  Brake light switch
2 25 Rear window heating
3 7.5 Instrument cluster
EZS module
4 15 EZS module
Electronic steering lock module
5 7.5 HAU module
KLA module (automatic air conditioning)
6 15 Horn (beep)
7 25 Fuel module (fuel pump fuse) with fuel level sensor
8 25 Overhead control panel
9 40 ESP and BAS control module
10 40 Fan motor
11 30 Motor 266: Relay circuit terminal 87, motor
40 Motor 640: Relay circuit terminal 87, motor
12 5 Steering column electronics
Multifunction steering wheel
13 25 Front Left Door Control Module
14 25 Front Right Door Control Module
15 25 ESP and BAS control module
16 10 Diagnostic connector
PTS control module (parktronic, 2005-2008)
17 5 Outdoor lighting rotary switch
18 7.5 Gearbox 711, 716:  Reverse light switch
19 5 Micromechanical angular velocity sensor AY
20 7.5 Passive safety system control module
21 30 Starter
22 7.5 Instrument cluster
23 20 Motor 640 (from 1.9.2008): Fuel filter condensate sensor with heating element
7.5 2005-2008:  Heated washer nozzles
24 7.5 Electric Power Steering (ES) Control Module
25 7.5 Brake light switch
ESP and BAS control module
26 7.5 gearbox 722: Control unit of the electronic selector lever module
27 10 gearbox 722: CVT (continuously variable automatic transmission) electrical control module
28 5 Outdoor lighting rotary switch
29 30 SAM control module
30 25 Relay of the electric circuit of terminal 87F
31 5 Outdoor lighting rotary switch
Central interface module (vehicles up to 30.11.05)
32 7.5 Engine 266.920:  Module ME
33 15 Audio system
Audio module and navigation box
Control panel COMAND
34 25 Rear left door module
35 25 Rear right door module
36 10 2008-2012 : PTS module (parking sensors)
7.5 2005-2008:  Trailer module
Cell phone circuit connector
37 7.5 Passive safety system control module
Passenger/child seat detection sensor on the front passenger seat
Front passenger seat occupancy detection system
38 25 Front cigarette lighter fuse Mercedes 245
39 25 Wiper motor
40 25 Sectional roof:  Overhead control panel (sunroof motor)
7.5 Overhead control panel
41 15 Tailgate wiper motor
42 7.5 Duffel box lighting with microswitch
Lighting of the cosmetic mirror left and right
Pedal pedal control sensor (driving school package)
Footwell light switch (driving school package)
Pluggable connection VICS + ETC power supply (Japan)
Emergency call system module (USA)
43 7.5 Motor 266: electrical circuit lug of terminal 87M1e
15 Motor 640: electrical circuit lug of terminal 87M1e
Dual-fuel gasoline engine: electrical circuit lug of terminal 87M1e
44 15 Motor 266: electrical circuit lug of terminal 87M2e
20 Motor 640: electrical circuit lug of terminal 87M2e
45 25 Engine 640:  CDI System Module
46 25 Woofer (Japan, 2008-2012)
40 Speaker amplifier (2008-2012)
7.5 UHI Module (Universal Mobile Phone Interface) (2005-2008)
GSM 1800 network compensator (2005-2008)
Telephone control module (Japan, 2005-2008)
47 7.5 Cell phone circuit connector
UHI Control Module (Universal Mobile Phone Interface)
Voice control system control module (2005-2008)
Telephone control module (Japan, 2005-2008)
48 7.5 EDW control unit / towing protection / interior protection systems
Alarm siren
49 25 left front seat cushion heating element (2005-2008)
Front Left Seat Backrest Heating Element (2005-2008)
Front Right Seat Cushion Heating Element (2005-2008)
Front Right Seat Backrest Heating Element (2005-2008)
50 7.5 Multimedia Interface Control Module (2008-2012)
Digital TV Tuner (2008-2012)
Digital sound broadcasting system module (2008-2012)
CD changer (2005-2008)
VICS + ETC power supply plug-in connection (Japan, 2005-2008)
30 Service vehicles:  Roof beam
Cable lug for electrical circuit terminal 30
51 10 Passenger Weight System (WSS) Control Module (Canada)
Control panel for special signaling system (service vehicles)
52 7.5 Emergency call system control module (vehicles up to 31.5.06)
5 VICS + ETC power supply connector (Japan, vehicles up to 31.5.06)
53 30 Cabin 12V socket
Rear cigarette lighter fuse w245
54 15 Service vehicles:  2-pin 12V socket
25 Speaker amplifier (2005-2008)
Woofer (2005-2008)
55 10 Front left headlamp
56 10 Front right headlamp
57 15 AHV trailer coupling, 13-pin (2008-2012)
20 audio interface (Japan. 2005-2008)
7.5 emergency call system
SDAR
58 25 Trailer control unit
59 20 AHV trailer coupling, 13-pin
Trailer control unit (vehicles up to 31.5.2005)
60 20 Driver's seat contact strip
61 20 Front passenger seat contact strip
62 40 2008-2012: Relay circuit terminal 15 (2) (optional equipment: xenon headlights, cell phone)
25 2005-2008: Relay circuit terminal 15 (2) (optional equipment: xenon headlights, cell phone)
63 7.5 SDAR (Canada)
25 Roof beam (company cars)
64 40 Engine 266:  Air Pump Relay
80 Engine 640: glow plug timer
65 80 Electric power steering (ES) control unit
66 60 SAM control unit
67 50 Circuit relay terminal 15R (2) (optional equipment)
68 50 Standard equipment (2008-2012): Engine and A/C suction fan with integrated regulator (2005-2008: (valid for 266.920 and 266.940 engine with gearbox 722))
60 Special equipment (2008-2012):  2005-2008: (valid for engines 640.940, 640.941, 266.960, 266.980 and engines 266.920, 266.940 with code (550): Trailer coupling))
69 50 terminal 15R circuits (1)
70 60 terminal 15 circuits (1)
71 150 Engine 640:  PTC Auxiliary Heater
72 60 2005-2008: electric circuit lug terminal 30
Service vehicles: Fuse 7 (F7f7) and 10 (F7f10)
Cab: Multifunctional Unit (MSS) 

Relay box

The optional K100 wiring block with relay modules is located under the instrument panel.

Location of the additional relay box in the passenger compartment
For access:


1. Remove the trim under the glove compartment.


2. Remove the panel near the door.


3. Move the floor trim aside.

Diagram
No. Description
A Relay, circuit 15R (2) (SA)
B Circuit 15R relay (1)
C Horn (beep) relay
D Rear window heating
E 1/2 wiper speed
F Turning on / off the wiper
G Circuit 15 (1)
H Reserve
I Motor 266: air pump
K Fuel pump relay (gasoline)
L Engine circuit 87 relay
M Starter
N Relay, circuit 87F
O Relay, circuit 15 (2) (SA: xenon, cell phone)
No. Appointment A
80-
81
Special equipment 30

All electrical equipment


General layout of the electrical system in the vehicle.
1. ABS module;
2. Heater/air conditioner fan motor resistor;
3. Air conditioning/heater control module-behind the air conditioning/heater control panel;
4. Air conditioning/heating humidity sensor on the intake system resonator;
5, 6. Antenna on the roof panel;
7. impact sensor, driver's side;
8. Impact sensor, passenger side;
9. Anti-theft system control unit;
10. Anti-theft system siren on the intake system resonator;
11. Sun sensor;
12. Audio amplifier - behind the right rear side trim panel;
13. Auxiliary heater control module-in the air conditioner control panel;
14. Battery - footwell;
15. CAN data bus, gateway control unit, audio system - behind the right rear side trim panel;
16. CAN data bus, gateway control unit - behind the instrument panel;
17. Compass control unit behind the instrument cluster;
18. Diagnostic connector (DLC);
19. Driver's door electrical control unit - in the door;
20. Electrical control unit for the left rear door - in the door;
21. Electrical control unit for the right rear door - in the door;
22. Passenger door electrical control unit-in the door;
23. Engine-Diesel ECU;
24. ECU - gasoline;
25. Relay box, instrument panel;
26. Fuse box, footwell;
27. Xenon headlight control unit, left. - under the left headlight;
28. Xenon headlight control unit, right. - under right headlamp;
29. Headlamp corrector motor, left;
30. Headlight correction motor, right;
31. Horn (beep);
32. Ignition switch control module;
33. Immobilizer ECU - in ignition switch control module;
34. Immobilizer ring antenna - in ignition switch control unit;
35. ECU for the gas filling system;
36. Multifunction control unit - functions: Brake fluid low level sensor, central locking, coolant level sensor, exterior lamps, interior lamps, hazard warning light, turn signal indicators, rear window heater, horn, reverse light switch, tailgate opening actuator, windshield wiper/washer, rear window wiper/washer;
37. Multimedia control unit;
38. Multifunction switch control unit;
39. Navigation system control unit - in the audio system unit;
40. Outside temperature sensor - behind the bumper;
41. Parktronic control module - behind the right rear side trim panel;
42. Power steering control module - on the steering rack;
43. Rain sensor - top center of the windshield;
44. Steering column electrical control unit - under the steering wheel;
45. Steering column lock control unit - on the steering column;
46. Subwoofer - behind the left rear side trim panel;
47. SRS ECU - under the center console;
48. Phone interface control unit - under the seat;
49. Trailer electrical control unit - in the rear rear side trim panel;
50. Transmission ECU - in the transmission;
51. Gearshift control unit - selector lever.

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Comments
Brian Douglas P...

Very helpful

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