Mercedes-Benz B-Class (W245; 2006-2011) fuses and relays



In this article, we consider the first-generation Mercedes-Benz B-Class (W245), produced from 2005 to 2011. Here you will find fuse box diagrams of Mercedes-Benz B160, B170, B180, B200 2006, 2007, 2008, 2009, 2010 and 2011, get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse layout) and relay.

See other Mercedes-Benz B-Class:

Fuse Layout Mercedes-Benz B-Class 2006-2011

Cigar lighter (power outlet) fuses in the Mercedes-Benz B-Class are the fuses #38 (Front cigar lighter) and #53 (Rear cigar lighter, Interior socket) in the Passenger Compartment fuse box.

Passenger Compartment Fuse Box

Fuse box location

The fuse box is located under the floor near the passenger seat (or near the driver’s seat on RHD).
Remove the floor panel, cover, and soundproofing.The location of the fuses in the passenger compartment: Mercedes-Benz B-Class (2006-2011)

Fuse box diagram

Interior fuse box diagram: Mercedes-Benz B-Class (2006-2011)



Assignment of the fuses in the passenger compartment
Fused functionAmp
12006-2008: Stop light switch10
1Light and vision package (2006-2008): Stop light switch

2009-2011: Stop light switch
2Heated rear window25
3Instrument cluster EIS [EZS] control unit7.5
4EIS [EZS] control unit
Electric steering lock control unit
5Automatic air conditioning and Comfort automatic air conditioning: HEAT control and operating unit

Automatic air conditioning: AAC [KLA] control and operating unit

Comfort automatic air conditioning: Comfort AAC [KLA] control and operating unit
6Left fanfare horn
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
11Valid for engine 640: Circuit 87 relay, engine40
12Steering column module
Multifunction steering wheel (2006-2008)
13Left front door control unit25
14Right front door control unit25
15ESP and BAS control unit25
16Data link connector
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 heating 7.5
23Valid for engine 640 as of 1.9.08: Fuel filter condensation sensor with heating element20
24Electric power steering (ES) control unit 7.5
25Stop light switch
ESp and BAS control unit
26Valid for transmission 722: Electronic selector lever module control unit 7.5
27Valid for transmission 722:  CVT (continuously variable automatic transmission) control unit 10
28Rotary light switch5
29SAM control unit30
30Circuit 87F relay25
312006-2008: Central gateway control unit (vehicles up to 30.11.05), Rotary light switch
2009-2011: Automatic light switch daylight sensor, Rain/light sensor
32Valid for engine 266: ME-SFI [ME] control unit7.5
33Radio Radio and navigation unit COMAND operating, display and control unit (Japan)15
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 unit
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
40Lamella roof: Overhead control panel control unit25
41Liftgate wiper motor15
42Glove compartment illumination with switch
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:
Terminal 87M1e connector sleeve
Bivalent natural gas drive (2009-2011):
Terminal 87M1e connector sleeve
43Valid for engine 640:
Terminal 87M1e connector sleeve
44Valid for engine 266:
Terminal 87M2e connector sleeve
44Valid for engine 640:
Terminal 87M2e connector sleeve
45Valid for engine 640:
CDI control unit
Telephone control unit, (Japan)
E-net compensator
Universal Portable CTeL Interface (UPCI [UHI]) control unit
462009-2011: Bass module speaker (Japan) 25
462009-2011: Amplifier for sound system40
47Telephone control unit, (Japan)
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 unit
Alarm signal horn with additional battery
49Upper control panel control unit
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
50Valid for government vehicles (2009-2011):
Roof light bar
Circuit 30 connector sleeve
51Canada (2009-2011): Weight Sensing System (WSS) control unit
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
52Spare (vehicles as of 1.6.06)7.5
52Emergency call system control unit (USA) (vehicles up to 31.5.06)7.5
53Rear cigar lighter with ashtray illumination
Interior socket
54Amplifier for sound system
Bass module speaker
54Valid for government vehicles (2009-2011): 2-pin 12V socket15
55Left front lamp unit (Bi-xenon)
Right front lamp unit (Bi-xenon)
55Left front lamp unit (Hi-xenon)10
56Right front lamp unit (Hi-xenon)10
572009-2011: Trailer hitch socket (13-pin)15
572006-2008: 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)
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)-
63Valid for government vehicles (2009-2011): Roof light bar25
63Emergency call system control unit (USA) (vehicles as of 1.6.05)
SDAR control unit (vehicles as of 1.6.05)
64Valid for engine 266: Air pump relay40
64Valid for engine 640: Engine wiring harness/engine compartment connector (2006-2008), Glow time output stage (2009-2011)80
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: AAC with integrated control additional fan motor50
68Valid for engine 640.940, 640.941, 266.960, 266.980 and for engine 266.920, 266.940 with (Trailer hitch): AAC with integrated control additional fan motor60
69Circuit 15R relay (1)50
70Circuit 15 relay (1)60
71Valid for engine 640: PTC heater booster150
722006-2008: Circuit 30 connector sleeve
Special vehicle multifunction control unit (SVMCU [MSS]) (Taxi)
Valid for government vehicles:
Fuse 7
Fuse 10


Relay Panel (K100)

Relay Panel (K100) location: Mercedes-Benz B-Class (2006-2011)

Relay Panel (K100): Mercedes-Benz B-Class (2006-2011)

Relay Panel (K100)
Fused functionAmp
80Reserved for special-purpose vehicles30
81Reserved for special-purpose vehicles30
82Reserved for special-purpose vehicles30
83Reserved for special-purpose vehicles30
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)