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

Mercedes-Benz W245 is a series of small compact B-class cars of the German company, introduced in 2005. In this material, we will analyze in detail the Mercedes fuse circuits in the W245 body 1st generation B-class (B160, B170, B180, B200) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 release.

general view of the car
Here you will find the locations and diagrams of the fuse blocks. Separately, we note the elements responsible for the cigarette lighter and fuel pump.

In the passenger compartment

Location of the fuse box in the passenger compartment
The main fuse block is located in the front passenger's footwell. To access it, you need to remove the floor cladding.


Photo is an example.

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 Heated rear window
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 sound signal
7 25 Fuel block (fuel pump) with fuel level sensor
8 25 Overhead control panel
9 40 ESP and BAS control module
10 40 Fan motor
11 30 Engine 266:  Relay el. terminal 87 circuits, motor
40 Engine 640:  Relay el. terminal 87 circuits, 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 ten Diagnostic connector
PTS control module (parktronic, 2005-2008)
17 5 Rotary switch for outdoor lighting
18 7.5 Gearbox 711, 716:  Reverse light switch
19 5 Micromechanical yaw rate sensor AY
20 7.5 Passive safety system control module
21 30 Starter
22 7.5 Instrument cluster
23 20 Engine 640 (from 1.9.08):  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 KP 722:  Selector lever electronics control unit
27 10 KP 722:  Electric control module CVT (continuously variable automatic transmission)
28 5 Rotary switch for outdoor lighting
29 30 SAM control module
30 25 Relay el. circuit terminal 87F
31 5 Rotary switch for outdoor lighting
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
Electrical connector mobile phone chain
37 7.5 Passive safety system control module
Front passenger seat passenger / child seat recognition sensor
Front passenger seat occupied recognition 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 Glove box lighting with microswitch 
Vanity mirror lighting left and right
Pedal depression control sensor (package for driving school)
Footwell light switch (driving school bag)
Pluggable connection VICS + ETC power supply (Japan)
Emergency call system module (USA)
43 7.5 Engine 266:  handpiece electr. circuit terminal 87M1e
15 Engine 640:  handpiece electr. circuit terminal 87M1e
Dual-fuel gas-petrol engine:  electric tip circuit terminal 87M1e
44 15 Engine 266:  handpiece electr. circuit terminal 87M2e
20 Engine 640:  handpiece electr. circuit 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 Electrical connector mobile phone chain
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 Front Left 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 electr. terminal 30 circuits
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 Salon 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 31.5.05)
60 20 Driver's seat contact strip
61 20 Front passenger seat contact strip
62 40 2008-2012:  Relay el. terminal 15 (2) circuits (accessories: xenon headlights, mobile phone)
25 2005-2008:  Relay el. terminal 15 (2) circuits (accessories: xenon headlights, mobile phone)
63 7.5  SDAR (Canada)
25 Roof beam (company cars)
64 40 Engine 266:  Air Pump Relay
80 Engine 640:  End of glow plug time
65 80 Electric power steering (ES) control unit
66 60 SAM control unit
67 50 Relay el. terminal 15R (2) circuits (accessory)
68 50 Standard equipment (2008-2012):  Electric suction fan for engine and air conditioning with integrated regulator (2005-2008: (valid for engines 266.920 and 266.940 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:  handpiece electr. terminal 30 circuits
Service vehicles: Fuse 7 (F7f7) and 10 (F7f10)
Taxi: Multifunctional Unit (MSS) 

An additional mounting block K100 with relay modules is located under the dash.  

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


1. Remove the lining under the glove compartment.


2. Dismantle the panel near the door.


3. Move the floor sheathing to the side. 

Diagram
No. Description
A Relay, circuit 15R (2) (SA)
B Circuit 15R relay (1)
C Signal
D Heated rear window
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
General layout of Mercedes W245 electrical equipment
No. Component
1 ABS module
2 Heater / A / C blower motor resistor
3 Air conditioning / heater control module - behind the air conditioning / heater control panel
4 Air Conditioning / Heating Humidity Sensor - on the resonator of the intake system
5 Roof antenna
6
7 shock sensor, driver's side
8 shock sensor, passenger side
9 Anti-theft control unit
10 Anti-theft siren - on the resonator of the intake system
11 Sun sensor
12 Audio Amplifier - Behind Right Rear Side Trim Panel
13 Additional heater control module - in the air conditioner control panel
14 Battery - legroom
15 CAN data bus, gateway control unit, audio system - behind the rear right side trim panel
16 CAN data bus, gateway control unit - behind the dashboard
17 Compass control unit - behind the instrument cluster
18 Diagnostic connector (DLC)
19 Driver's door electrical control unit - in the door
20 Control unit for electrical equipment of the left rear door-in the door
21 Control unit for electrical equipment of the right rear door - in the door
22 Passenger door-in-door electrical control unit
23 ECU engine-Diesel
24 ECU - gasoline
25 Relay box, instrument panel
26 Fuse box, legroom
27 Xenon headlamp control unit, left - under the left headlight
28 Xenon headlamp control unit, right - under the right headlight
29 Headlight range control motor, left
30 Headlight range control motor, right
31 Horn
32 Ignition switch control module
33 ECU immobilizer - in the ignition switch control unit
34 Immobilizer ring antenna - ignition lock
35 ECU of the gas cylinder power supply system
36 Multifunctional control unit - Functions: Low brake fluid level sensor, central locking, coolant level sensor, exterior lamps, interior lamps, hazard warning lights, direction indicators, heated rear window, horn, reversing light switch, tailgate opener , windshield wiper / washer, rear window wiper / washer
37 Multimedia control unit
38 Multi-function switch control unit
39 Navigation control unit - in the audio system unit
40 Outside air 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 - Windshield Upper Center
44 Steering column electronics control unit - under the steering wheel
45 Steering column lock control unit - on the steering column
46 Subwoofer - Behind Left Rear Side Trim Panel
47 SRS ECU - under the center console
48 Telephone interface control unit - under the seat
49 Trailer electrical control unit - with rear side trim panel
50 Gearbox ECU - in gearbox
51 Gear Shift Control Unit - Selector
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