Mercedes-Benz C-Class (W203) (2000-2007) Fuse Diagram

Fuse box diagram (fuse layout), location, and assignment of fuses and relays Mercedes-Benz C-Class – C180, C200, C220, C230, C240, C270, C280, C320, C350, C30 AMG, C32 AMG, C55 AMG (W203) (2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007).

Mercedes-Benz C-Class (W203) (2000-2007)

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.

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.

Notice

  • 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.

Instrument Panel Fuse Box

Instrument Panel Fuse Box Location

  1. Pull cover (1) open with a screwdriver or a similar tool.
  2. Remove cover rearward.

Instrument Panel Fuse Box Diagram

Circuit protectedA
21Left front door control unit30
22Right front door control unit30
23Up to 30.11.04: Central gateway control unit15
24CD player with changer (in glove compartment)7.5
25Upper control panel control unit30
26Sound amplifier25
27Driver-side front seat adjustment control unit, with memory30
Special vehicle multifunction control unit (SVMCU [MSS])
28Spare30
29Driver-side front seat adjustment control unit, with memory30
Driver-side front seat adjustment control unit, with memory
Special vehicle multifunction control unit
30Heating systems recirculation unit40
31   EIS [EZS] control unit20
   Electric steering lock control unit
32Left rear door control unit30
33Right rear door control unit30
34Cell phone separation point7.5
up to 31.5.01:
   Telephone and TELE AID transmitter/receiver, D2B
   Telephone transmitter and receiver unit, D2B
   Telephone interface
   E-net compensator
up to 31.5.01, Japan version: E-call control unit
up to 31.3.04: Front passenger front seat adjustment control unit with memory15
as of 1.4.04: Passenger-side front seat adjustment control unit with memory
up to 31.5.03, Taxi: Special vehicle multifunction control unit 
as of 1.6.03, Taxi: Special vehicle multifunction control unit
as of 1.6.01, Police: Special vehicle multifunction control unit 
as of 1.4.04: Front passenger front seat adjustment control unit with memory30
as of 1.4.04, Taxi: Special vehicle multifunction control unit
35up to 31.3.04: STH heater unit30
as of 1.4.04: STH heater unit20
36up to 31.3.04, Police: Interior socket30
Valid for engine (612.990) (up to 29.2.04): Charge air cooler circulation pump15
as of 1.4.04, Japan version: Audio gateway control unit
Universal Portable CTEL Interface (UPCI [UHI]) control unit7.5
37Charge air cooler circulation pump25
up to 29.2.04: Brake booster vacuum pump control unit
38up to 29.2.04:Passenger-side front seat adjustment control unit with memory30
as of 1.4.04, Police:Special vehicle multifunction control unit (SVMCU [MSS])
39Spare30
40Passenger-side front seat adjustment control unit with memory7.5
Universal Portable CTEL Interface (UPCI [UHI]) control unit
Cell phone separation point
Telephone interface
E-net compensator
as of 1.6.01, MB standard telephone: Telephone transmitter and receiver unit, D2B
as of 1.6.01, TELE AID: Telephone and TELE AID transmitter/receiver, D2B
as of 1.6.01, Canadian vehicles: Via the trunk lid/FFS [RBA] separation point the trunk lid emergency release switch and the rear SAM control unit with fuse and relay module
USA version: Via the trunk lid/FFS [RBA] separation point the trunk lid emergency release switch and the rear SAM control unit with fuse and relay module
as of 1.4.04, Japan version: E-call control unit
up to 31.5.01: Special vehicle multifunction control unit30
41HEAT control and operating unit7.5
up to 31.5.01:
   AAC [KLA] control and operating unit
   Comfort AAC [kLa] control and operating unit
as of 1.6.01:15
   AAC [KLA] control and operating unit
   Comfort AAC [KLA] control and operating unit
42Instrument cluster7.5

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Engine Compartment Fuse Box

The fuse box is located in the engine compartment on the left-hand side.

Engine Compartment Fuse Box Location

Engine Compartment Fuse Box Location

  1. Twist screws (1) 90° counterclockwise.
  2. Pull up cover (2)
  3. Slide-out retainer (3) and remove the cover by pulling towards the front.
  4. Install cover (2) in reverse order.
  5. Release clamps (5)
  6. Remove cover (4)

Engine Compartment Fuse Box Diagram

Circuit protectedA
43aFanfare horn relay15
43bFanfare horn relay15
44Telephone and TELE AID transmitter/ receiver, D2B5
Telephone transmitter and receiver unit, D2B 
Cell phone separation point
45Restraint systems control unit7.5
46Wiper ON/OFF relay40
Wiper speed 1 and 2 relay
47Glove compartment illumination with switch15
Front cigar lighter (with illumination)
48Valid for engine 612.990 (up to 31.3.04): Brake booster vacuum pump control unit15
Valid for engine 112 and engine 113: Circuit 15 connector sleeve (fused)
Valid for engine 646, USA version (up to 31.3.04): Circuit 30 connector sleeve
Valid for engine 646 (as of 1.4.04): O2 sensor upstream of TWC [kAt] connector
49Restraint systems control unit7.5
50Light switch module5
Valid for engine 612.990
   Glow output stage (up to 31.3.04)
   Hot film mass air flow sensor (1.4.04 up to 30.11.04)
51AAC with integrated control additional fan motor7.5
Instrument cluster
Valid for code (581) comfort automatic air conditioning:
   C-AAC [K-KLA] multifunction sensor
   C-AAC [K-KLA] sun sensor (4 in total)
   Left front lamp unit
   Right front lamp unit
Valid for AMG vehicles: Charge air cooler circulation pump
Valid for model 203.0 (up to 31.7.01): SPS [PML] control unit
52Starter15
53Valid for diesel engines:
   Starter relay 25
   Rear SAM control unit with fuse and relay module
Valid for engine 611/612/642/646: CDI control unit
Valid for gasoline engines:15
   Starter relay
   Rear SAM control unit with fuse and relay module
Valid for engine 111/271/272: ME-SFI [ME] control unit
Valid for engine 112/113:
   ME-SFI [ME] control unit
   Circuit 87M1e connector sleeve
54Valid for engine 271.940:15
   ME-SFI [ME] control unit
   Purge control valve (USA version)
   Activated charcoal canister shutoff valve
Valid for engine 271.942: NOX (nitrogen oxides) control unit
Valid for engine 642/646: CDI control unit
Valid for engine 642/646: Circuit 30 connector sleeve
Valid for engines 611/612: CDI control unit7.5
Valid for engine 611/612 (up to 30.11.04): Vent line heater element
55Steering angle sensor7.5
Distronic: DTR control unit
Valid for transmission 722:
   ETC [EGS] control unit (up to 31.5.04)
   Electronic selector lever module control unit
   Electric controller unit (VGS)
Valid for transmission 716:
   Gear recognition switch
   Automated manual transmission control unit
56ESP and BAS control unit5
Stop light switch
57Steering angle sensor (up to 31.5.02)5
EIS [EZS] control unit 
Steering column module (as of 1.6.02)
Valid for engine 112/113: ME-SFI [ME] control unit
58Valid for transmission 716: SEQ hydraulic pump40
59ESP and BAS control unit50
60ESP and BAS control unit40
61Valid for transmission 716: Automated manual transmission control unit15
62Data link connector5
Light switch module
Stop light switch
63Light switch module5
64Radio10
Radio and navigation unit
COMAND operating, display and control unit
65Valid for engine 112/113: Electric air pump40
Relay
IFanfare horn system relay
KTerminal 87 relay, chassis
LWiper speed 1 and 2 relay
MTerminal 15R relay
NSEQ [ASG] pump control relay (with Sequentronic automated manual transmission (ASG))
OAir pump relay (engines 112, 113, 271 only)
PTerminal 15 relay
QWiper ON/OFF relay
RTerminal 87 relay, engine
SStarter relay

Front prefuse box

Front prefuse box

Circuit protectedA
1Interior fuse box125
2Rear SAM control unit with fuse and relay module200
3Additional fuse holder l, spare wheel well125
4Front SAM control unit with fuse and relay module200
5Engine and AC electric suction fan with integrated control125
Valid for diesel engines: Glow output stage
6Front SAM control unit with fuse and relay module60

Luggage Compartment Fuse Box

It is on the left-hand side of the trunk.

Luggage Compartment Fuse Box Location

  1. Trim panel
  2. Cover of auxiliary fuse box
  3. Special fuse extractor

Luggage Compartment Fuse Box Diagram

Circuit protectedA
1Front passenger front seat adjustment control unit with memory30
Front passenger partially-electric seat adjustment switch
2Driver front seat adjustment control unit with memory30
Driver partially-electric seat adjustment switch
3Dome lamp7.5
Right luggage compartment lamp
Left luggage compartment lamp
STH radio remote control receiver
TV tuner (up to 29.2.04)20
TV tuner (MOST) (as of 1.4.04)
4Fuel pump relay (N10/2kA)20
5Valid for engine 112.961 (up to 31.3.04): Charge air cooler circulation pump20
Valid without engine 112.961: Backup relay 2
6Spare25
7Backup relay 17.5
8Amplifier module, window antenna7.5
Alarm signal horn (H3) ATA [EDW] inclination sensor
9Overhead control panel control unit25
10Heated rear window40
11Spare20
12Interior socket15
Valid for model 203.0 USA version (up to 31.3.04): Power outlet
13Multicontour seat pneumatic pump5
Voice control system control unit
Rear dome lamp
Rear dome lamp PTS warning indicator
PTS control unit
Japan version: VICS+ETC voltage supply separation point.
14Tailgate wiper motor15
15Fuel filler cap polarity change relay 110
Fuel filler cap polarity change relay 2
16Voice control system control unit20
17Trailer recognition control unit20
18Trailer hitch socket (13-pin)20
19Multicontour seat pneumatic pump20
20Rear window roller blind relay15
Valid for model 203.2/7 USA version: Power outlet
Relay
AFuel pump relay
BRelay 2, terminal 15R
CReserve relay 2
DReserve relay 1
ERear window defroster relay
FRelay 1, terminal 15R
GFiller cap relay, polarity reverser 1
HFiller cap relay, polarity reverser 2