Mercedes-Benz A-Class (W169) (2004-2012) Fuse Diagram

Fuse box diagram (fuse layout), location, and assignment of fuses and relays Mercedes-Benz A-Class A150, A160, A170, A180, A200 (W169) (2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012).

Mercedes-Benz A-Class (W169) (2004-2012)

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 Diagram

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
1Stop light switch10
Valid for code (U62) Light and vision package:5
   Stop light switch
2Heated rear window25
3Instrument cluster7.5
EIS [EZS] control unit
4EIS [EZS] control unit15
Electric steering lock control unit
5Valid without code (580) Automatic air conditioning and without code (581) Comfort automatic air conditioning:7.5
   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 horn15
Right fanfare horn
7Fuel pump relay25
Valid for model 169.090:5
   DC/DC converter control unit
8Overhead control panel control unit25
9ESP and BAS control unit40
10Blower regulator/interior wiring harness connector40
11Valid for engine 266:30
   Circuit 87 relay, engine
Valid for engine 640:40
   Circuit 87 relay, engine
12Steering column module5
Multifunction steering wheel
13Left front door control unit25
14Right front door control unit25
15ESP and BAS control unit25
16Data link connector10
PTS control unit
17Rotary light switch5
18Valid for transmission 711, 716:7.5
   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
Valid for engine 640 as of 1.9.08:20
   Fuel filter condensation sensor with heating element
24Electric power steering (ES) control unit7.5
25Stop light switch7.5
ESp and BAS control unit
26Valid for transmission 722:7.5
   Electronic selector lever module control unit
27Valid for transmission 722:10
   CVT (continuously variable automatic transmission) control unit
28Rotary light switch5
29SAM control unit30
30Circuit 87F relay25
31Central gateway control unit (vehicles up to 30.11.05)5
Rotary light switch
Automatic light switch daylight sensor
Rain/light sensor
32Valid for engine 266:7.5
   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 point7.5
Trailer control unit
Trailer control unit10
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
40Overhead control panel control unit7.5
Roof motor25
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
Valid for engine 640:7.5
   Terminal 87M1e connector sleeve
Valid for model 169.090:20
   Vacuum pump 1 control unit
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
Valid for model 169.090:
   Vacuum pump 2 control unit
46Telephone control unit, (Japan)7.5
E-net compensator
Universal Portable CTeL Interface (UPCI [UHI]) control unit
Bass module speaker (Japan)25
Amplifier for sound system40
Valid for model 169.090:5
   Charging control unit
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
Valid for model 169.090:
   Charger 1
48ATA [EDW]/tow-away protection/interior protection control unit7.5
Alarm signal horn with additional battery
Valid for model 169.090:
   Charger 2
49Upper control panel control unit25
Left front seat heated cushion
Left front backrest heated cushion
Right front seat cushion heater element
Right front backrest seat cushion heater element
50CD changer7.5
Media interface control unit
Digital TV tuner
Digital Audio Broadcasting control unit
VICS+ETC voltage supply separation point (Japan)
Valid for government vehicles:30
   Roof light bar
   Circuit 30 connector sleeve
51Valid for model 169.090:10
   Cooling fan
   Low temperature coolant pump
52VICS+ETC voltage supply separation point (Japan) (vehicles up to 31.5.06)5
Valid for model 169.090:
   Electric drive control unit
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 model 169.090:5
   Electric drive control unit
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
57Trailer hitch socket (13-pin) (vehicles as of 1.6.05)15
Audio gateway control unit (Japan) (vehicles up to 31.5.05)25
SDAR control unit7.5
Emergency call system control unit (USA)
58Trailer control unit25
Valid for model 169.090:
   Vehicle gateway control unit
59Trailer control unit (vehicles up to 31.5.05)20
Trailer hitch socket (13-pin) (vehicles as of 1.6.05)
Valid for model 169.090:5
   Battery management system control unit 1
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)-
Audio gateway control unit (Japan) (vehicles as of 1.6.05)25
Valid for government vehicles:
   Roof light bar
Emergency call system control unit (USA) (vehicles as of 1.6.05)7.5
SDAR control unit
Valid for model 169.090:5
   Battery management system control unit 2
64Valid for engine 266:40
   Air pump relay
Valid for engine 640:80
   Engine wiring harness/engine compartment connector
   Glow time output stage
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 640:150
   PTC heater booster
72Circuit 30 connector sleeve60
Special vehicle multifunction control unit (SVMCU [MSS]) (Taxi)


Relay Module

Relay Module (location)

Relay Module

Fused functionA
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)