2005-2012 Mercedes-Benz A-Class (W169) fuse box diagram

The second-generation Mercedes-Benz A-Class (W169), manufactured from 2004 to 2012, includes models such as the A150, A160, A180, and A200. If you own a 2005-2012 model, this guide will help you locate the fuse box diagrams, understand the fuse panel locations inside the vehicle, and learn about the specific assignment and layout of each fuse. This information is essential for troubleshooting electrical issues and ensuring your car’s systems function properly.

Cigar lighter (power outlet) fuses in the Mercedes-Benz A-Class are the fuses #38 (Front cigar lighter) and #52 (Rear cigar lighter, Interior socket) in the Passenger Compartment fuse box.

Passenger Compartment

Fused functionFuse
1Stop light switch10
1Valid for code (U62) Light and vision package: Stop light switch5
2Heated rear window25
3Instrument cluster
EIS [EZS] control unit
4EIS [EZS] control unit
Electric steering lock control unit
5Valid without code (580) Automatic air conditioning and without code (581) Comfort automatic air conditioning: HEAT control and operating unit

Valid for code (580) Automatic air conditioning: AAC [KLA] control and operating unit

Valid for code (581) comfort automatic air conditioning: Comfort AAC [KLA] control and operating unit
6Left fanfare horn
Right fanfare horn
7Fuel pump relay25
7Valid for model 169.090: DC/DC converter control unit5
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
13Left front door control unit25
14Right front door control unit25
15ESP and BAS control unit25
16Data link connector
PTS control unit
17Rotary light switch5
18Valid for transmission 711, 716:
Backup lamp switch

Valid for model 169.090:
A/C compressor control unit
BKGN Energy monitoring control unit
Vacuum pump 1 control unit
Vacuum pump 2 control unit
19Micromechanical turn rate sensor AY pickup5
20Restraint systems control unit7.5
21Starter relay30
22Instrument cluster7.5
23Washer nozzle heating7.5
23Valid for engine 640 as of 1.9.08: Fuel filter condensation sensor with heating element20
24Electric power steering (ES) control unit7.5
25Stop light switch
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
31Central 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 unit
Valid for model 169.090: Energy monitoring control unit
Radio and navigation unit
COMAND operating, display and control unit (Japan)
34Left rear door control unit25
35Right rear door control unit25
36Cell phone separation point
Trailer control unit
36Trailer 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
40Overhead control panel control unit7.5
40Roof motor25
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 sleeve15
43Valid for engine 640: Terminal 87M1e connector sleeve7.5
43Valid for model 169.090: Vacuum pump 1 control unit20
44Valid for engine 266: Terminal 87M2e connector sleeve15
44Valid for engine 640: Terminal 87M2e connector sleeve20
45Valid for engine 640: CDI control unit
Valid for model 169.090: Vacuum pump 2 control unit
46Telephone control unit, (Japan)
E-net compensator
Universal Portable Tel Interface (UPCI [UHI]) control unit
46Bass module speaker (Japan)25
46Amplifier for sound system40
46Valid for model 169.090: Charging control unit5
47Telephone control unit, (Japan)
Universal Portable CTEL Interface (UPCI [UHI]) control unit
Cell phone separation point
Voice control system (VCS [SBS]) control unit
Valid for model 169.090: Charger 1
48ATA [EDW]/tow-away protection/interior protection control unit
Alarm signal horn with additional battery
Valid for model 169.090: Charger 2
49Upper control panel control unit
Left front seat heated cushion
Left front backrest heated cushion
Right front seat cushion heater element
Right front backrest seat cushion heater element
50CD changer
Media interface control unit
Digital TV tuner
Digital Audio Broadcasting control unit
VICS+ETC voltage supply separation point (Japan)
50Valid for government vehicles: Roof light bar, Circuit 30 connector sleeve30
51Valid for model 169.090: Cooling fan, Low temperature coolant pump10
52VICS+ETC voltage supply separation point (Japan) (vehicles up to 31.5.06)
Valid for model 169.090: Electric drive control unit
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 model 169.090: Electric drive control unit5
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
57Trailer hitch socket (13-pin) (vehicles as of 1.6.05)15
57Audio gateway control unit (Japan) (vehicles up to 31.5.05)25
57SDAR control unit
Emergency call system control unit (USA)
58Trailer control unit
Valid for model 169.090: Vehicle gateway control unit
59Trailer control unit (vehicles up to 31.5.05)
Trailer hitch socket (13-pin) (vehicles as of 1.6.05)
59Valid for model 169.090: Battery management system control unit 15
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)
63Audio gateway control unit (Japan) (vehicles as of 1.6.05)
Valid for government vehicles: Roof light bar
63Emergency call system control unit (USA) (vehicles as of 1.6.05)
SDAR control unit
63Valid for model 169.090: Battery management system control unit 25
64Valid for engine 266: Air pump relay40
64Valid for engine 640: Engine wiring harness/engine compartment connector, Glow time output stage80
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
72Circuit 30 connector sleeve
Special vehicle multifunction control unit (SVMCU [MSS]) (Taxi)

Relay Panel (K100)

Fused functionFuse
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
IAir pump relay
KFuel pump relay
LEngine circuit 87 relay
MStarter relay
NCircuit 87F relay
OCircuit 15 relay (2) (SA: xenon, cell phone)
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Tom Smith is a passionate car mechanic and automotive enthusiast, specializing in the intricate world of car fuse boxes. With years of hands-on experience under the hood, he has earned a reputation as a reliable expert in his field. As the founder and content creator of the popular blog website 'carsfuse.com,' Tom has dedicated himself to sharing his extensive knowledge of car fuse boxes and electrical systems with the world.

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