Mercedes-Benz B-Class (W245) (2006-2011) Fuse Diagram


Fuse box diagram (fuse layout), location, and assignment of fuses and relays Mercedes-Benz B-Class B150, B160, B170, B180, B200 (W245) (2006, 2007, 2008, 2009, 2010, 2011).

Mercedes-Benz B-Class (W245) (2006-2011)

Checking and Replacing Fuses

The fuses in your vehicle serve to close down faulty circuits. If a fuse blows, all the components on the circuit and their functions stop operating. If a fuse has blown, the inside element will be melted. Blown fuses must be replaced with fuses of the same rating, which you can recognize by the color and value. The fuse ratings are listed in the fuse allocation chart.

If a newly inserted fuse also blows, have the cause traced and rectified at a qualified specialist workshop, e.g. an authorized Mercedes-Benz Center.


  • Before changing a fuse, secure the vehicle against rolling away and switch off all electrical consumers.
  • Always disconnect the battery before servicing high current fuses.
  • Always replace faulty fuses with the specified new fuses having the correct amperage. If you manipulate or bridge a faulty fuse or if you replace it with a fuse with a higher amperage, the electric cables could be overloaded. This could result in a fire. There is a risk of an accident and injury.
  • Only use fuses that have been approved for Mercedes-Benz vehicles and which have the correct fuse rating for the system concerned. Only use fuses marked with an “S”. Otherwise, components or systems could be damaged.

Passenger Compartment Fuse Box

The main fuse box is located in the front-passenger footwell in front of the seat.

Passenger Compartment Fuse Box Location

To access:

  1. Remove the footmats.
  2. Turn retaining screw (2) anti-clockwise using a coin for example.
  3. Raise cover (1) and remove it.
  4. Remove the cover mat from the battery.

Passenger Compartment Fuse Box Location

  1. Fuse allocation chart
  2. Fuse box


Passenger Compartment Fuse Box Diagram

Fused functionA
12006-2008: Stop light switch10
Light and vision package (2006-2008): Stop light switch5
2009-2011: Stop light switch
2Heated rear window25
3Instrument cluster7.5
EIS [EZS] control unit
4EIS [EZS] control unit15
Electric steering lock control unit
5Automatic air conditioning and Comfort automatic air conditioning:HEAT control and operating unit7.5
Automatic air conditioning: AAC [KLA] control and operating unit
Comfort automatic air conditioning: Comfort AAC [KLA] control and operating unit
6Left fanfare horn15
Right fanfare horn
7Fuel pump relay25
8Overhead control panel control unit25
9ESP and BAS control unit40
10Blower regulator/interior wiring harness connector40
11Valid for engine 266: Circuit 87 relay, engine30
Valid for engine 640: Circuit 87 relay, engine40
12Steering column module5
Multifunction steering wheel (2006-2008)
13Left front door control unit25
14Right front door control unit25
15ESP and BAS control unit25
16Data link connector10
Parktronic system (PTS) control unit (2006-2008)
17Rotary light switch5
18Valid for transmission 711, 716: Backup lamp switch7.5
19Micromechanical turn rate sensor AY pickup5
20Restraint systems control unit7.5
21Starter relay30
22Instrument cluster7.5
232006-2008: Washer nozzle heating7.5
Valid for engine 640 as of 1.9.08: Fuel filter condensation sensor with heating element20
24Electric power steering (ES) control unit7.5
25Stop light switch7.5
ESp and BAS control unit
26Valid for transmission 722: Electronic selector lever module control unit7.5
27Valid for transmission 722: CVT (continuously variable automatic transmission) control unit10
28Rotary light switch5
29SAM control unit30
30Circuit 87F relay25
   Central gateway control unit (vehicles up to 30.11.05)
   Rotary light switch
   Automatic light switch daylight sensor
   Rain/light sensor
32Valid for engine 266: ME-SFI [ME] control unit7.5
Radio and navigation unit
COMAND operating, display and control unit (Japan)
34Left rear door control unit25
35Right rear door control unit25
   Cell phone separation point
   Trailer control unit
   Trailer control unit
   PTS control unit
37Restraint systems control unit7.5
Front passenger seat occupied recognition sensor
Front passenger seat occupied and child seat recognition sensor
38Front cigar lighter with ashtray illumination25
39Wiper motor25
40Louvered sunroof: Overhead control panel control unit7.5
Lamella roof: Overhead control panel control unit25
41Liftgate wiper motor15
42Glove compartment illumination with switch7.5
Left and right vanity mirrors illumination
Footwell illumination switch (driving school package)
Pedal operation monitor switch (driving school package)
VICS+ETC voltage supply separation point (Japan)
43Valid for engine 266:15
   Terminal 87M1 e connector sleeve
Bivalent natural gas drive (2009-2011):
   Terminal 87M1e connector sleeve
Valid for engine 640:7.5
   Terminal 87M1e connector sleeve
44Valid for engine 266:15
   Terminal 87M2e connector sleeve
Valid for engine 640:20
   Terminal 87M2e connector sleeve
45Valid for engine 640:25
   CDI control unit
   Telephone control unit, (Japan)
   E-net compensator
   Universal Portable CTeL Interface (UPCI [UHI]) control unit
2009-2011: Bass module speaker (Japan)25
2009-2011: Amplifier for sound system40
47Telephone control unit, (Japan)7.5
Universal Portable CTEL Interface (UPCI [UHI]) control unit
Cell phone separation point
Voice control system (VCS [SBS]) control unit
48ATA [EDW]/tow-away protection/interior protection control unit7.5
Alarm signal horn with additional battery
49Upper control panel control unit25
Left front seat heated cushion (2006-2008)
Left front backrest heated cushion (2006-2008)
Right front seat cushion heater element (2006-2008)
Right front backrest seat cushion heater element (2006-2008)
   CD changer
   VICS+ETC voltage supply separation point (Japan)
   Media interface control unit
   Digital TV tuner
   Digital Audio Broadcasting control unit
Valid for government vehicles (2009-2011):30
   Roof light bar
   Circuit 30 connector sleeve
51Canada (2009-2011): Weight Sensing System (WSS) control unit10
Valid for government vehicles (2009-2011): Special signal system control panel
52VICS+ETC voltage supply separation point (Japan) (vehicles up to 31.5.06)5
Spare (vehicles as of 1.6.06)7.5
Emergency call system control unit (USA) (vehicles up to 31.5.06)7.5
53Rear cigar lighter with ashtray illumination30
Interior socket
54Amplifier for sound system25
Bass module speaker
Valid for government vehicles (2009-2011): 2-pin 12V socket15
55Left front lamp unit (Bi-xenon)7.5
Right front lamp unit (Bi-xenon)
Left front lamp unit (Hi-xenon)10
Right front lamp unit (Hi-xenon)10
572009-2011: Trailer hitch socket (13-pin)15
2006-2008: Audio gateway control unit (Japan)25
   SDAR control unit
   Emergency call system control unit (USA)
58Trailer control unit25
59Trailer control unit (vehicles up to 31.5.05)20
Trailer hitch socket (13-pin) (vehicles as of 1.6.05)
60Driver seat connector block20
61Front passenger seat connector block20
62Circuit 15 relay (2) (SA: xenon, cell phone)25
63Spare (vehicles up to 31.5.05)-
Valid for government vehicles (2009-2011): Roof light bar25
Emergency call system control unit (USA) (vehicles as of 1.6.05)7.5
SDAR control unit (vehicles as of 1.6.05)
64Valid for engine 266: Air pump relay40
Valid for engine 640:80
   Engine wiring harness/engine compartment connector (2006-2008)
   Glow time output stage (2009-2011)
65Electric power steering (ES) control unit80
66SAM control unit60
67Circuit 15R relay (2) (SE)50
68Valid for engine 266.920 and engine 266.940 with transmission 722:50
   AAC with integrated control additional fan motor
Valid for engine 640.940, 640.941, 266.960, 266.980 and for engine 266.920, 266.940 with (Trailer hitch):60
   AAC with integrated control additional fan motor
69Circuit 15R relay (1)50
70Circuit 15 relay (1)60
71Valid for engine 640: PTC heater booster150
722006-2008: Circuit 30 connector sleeve60
   Special vehicle multifunction control unit (SVMCU [MSS]) (Taxi)
   Valid for government vehicles:
      Fuse 7
      Fuse 10


Relay Module

Relay Module (location)

Relay Module

Fused functionA
80Special vehicle multifunction control unit30
81Special vehicle multifunction control unit30
82Special vehicle multifunction control unit30
83Special vehicle multifunction control unit30
ACircuit 15R relay (2) (SA)
BCircuit 15R relay (1)
CFanfare horn relay
DHeated rear window relay
EWiper stage 1/2 relay
FWiper ON/OFF relay
GCircuit 15 relay (1)
HBackup relay
IValid for engine 266: Air pump relay
KFuel pump relay
LEngine circuit 87 relay
MStarter relay
NCircuit 87F relay
OCircuit 15 relay (2) (SA: xenon, cell phone)