Mercedes-Benz C-Class (W203; 2000-2007) fuses and relays

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In this article, we consider the second-generation Mercedes-Benz C-Class (W203), produced from 2000 to 2007. Here you will find fuse box
diagrams of Mercedes-Benz C160, C180, C200, C220, C230, C240, C270, C280, C320, C350, C30, C32, C50 2000, 2001, 2002, 2003, 2004,
2005, 2006 and 2007, 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 C-Class:

Mercedes-Benz C-Class (W204; 2008-2014)…>>

Mercedes-Benz C-Class (W205; 2015-2019-..)…>>

Fuse Layout Mercedes-Benz C-Class 2000-2007

Cigar lighter (power outlet) fuses in the Mercedes-Benz C-Class are the fuse #47 (Front cigar lighter) in the Engine Compartment Fuse Box,
and fuse #12 (Interior socket / Power outlet) in the Luggage Compartment Fuse Box.
 Table of Contents
 Instrument Panel Fuse Box
o Fuse box location
o Fuse box diagram
 Engine Compartment Fuse Box
o Fuse box location
o Fuse box diagram
 Front Prefuse Box
 Luggage Compartment Fuse Box
o Fuse box location
o Fuse box diagram

Instrument Panel Fuse Box

Fuse box location

The fuse box is located on the driver’s side edge of the instrument panel, behind the cover.

Fuse box diagram

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Assignment of the fuses in the instrument panel

№ Circuit protected Amp

21 Left front door control unit 30

22 Right front door control unit 30

23 Up to 30.11.04: Central gateway control unit 15

24 CD player with changer (in glove compartment) 7.5

25 Upper control panel control unit 30

26 Sound amplifier 25

27 Driver-side front seat adjustment control unit, with memory 30

Special vehicle multifunction control unit (SVMCU [MSS])

28 Spare 30

29 Driver-side front seat adjustment control unit, with memory 30

Driver-side front seat adjustment control unit, with memory
Special vehicle multifunction control unit
№ Circuit protected Amp

30 Heating systems recirculation unit 40

31 EIS [EZS] control unit 20

Electric steering lock control unit

32 Left rear door control unit 30

33 Right rear door control unit  30

34 Cell phone separation point 7.5

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

34 up to 31.3.04: Front passenger front seat adjustment control unit with memory 15
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

34 as of 1.4.04: Front passenger front seat adjustment control unit with memory 30
№ Circuit protected Amp

as of 1.4.04, Taxi: Special vehicle multifunction control unit

35 up to 31.3.04 : STH heater unit 30

35 as of 1.4.04 : STH heater unit  20

36 up to 31.3.04, Police:  Interior socket  30

36 Valid for engine (612.990) (up to 29.2.04): Charge air cooler circulation pump 15
as of 1.4.04, Japan version: Audio gateway control unit

36 Universal Portable CTEL Interface (UPCI [UHI]) control unit  7.5

37 Charge air cooler circulation pump 25

up to 29.2.04: Brake booster vacuum pump control unit

38 up to 29.2.04:Passenger-side front seat adjustment control unit with memory 30

as of 1.4.04, Police:Special vehicle multifunction control unit (SVMCU [MSS])

39 Spare 30
№ Circuit protected Amp

40 Passenger-side front seat adjustment control unit with memory 7.5

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

40 up to 31.5.01:  Special vehicle multifunction control unit 30

41 HEAT control and operating unit 7.5

up to 31.5.01:
AAC [KLA] control and operating unit
Comfort AAC [kLa] control and operating unit

41 as of 1.6.01: 15
AAC [KLA] control and operating unit
Comfort AAC [KLA] control and operating unit

42 Instrument cluster 7.5

№ Circuit protected Amp

Engine Compartment Fuse Box

Fuse box location

The fuse box is located in the engine compartment (left-side), under the cover.

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 Fuse box diagram

Assignment of the fuses and relay in the engine compartment

№ Circuit protected Amp

43a Fanfare horn relay 15

43 Fanfare horn relay 15

b
№ Circuit protected Amp

44 Telephone and TELE AID transmitter/ receiver, D2B 5

Telephone transmitter and receiver unit, D2B
Cell phone separation point

45 Restraint systems control unit 7.5

46 Wiper ON/OFF relay 40

Wiper speed 1 and 2 relay

47 Glove compartment illumination with switch 15

Front cigar lighter (with illumination)

48 Valid for engine 612.990 (up to 31.3.04): Brake booster vacuum pump control unit 15
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): O 2 sensor upstream of TWC [kAt] connector

49 Restraint systems control unit 7.5

50 Light switch module 5

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)

51 AAC with integrated control additional fan motor 7.5

№ Circuit protected Amp

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

52 Starter 15

53 Starter relay 25
Rear SAM control unit with fuse and relay module
Valid for engine 611/612/642/646: CDI control unit

53 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

54 Valid for engine 271.940: 15

ME-SFI [ME] control unit
Purge control valve (USA version)
Activated charcoal canister shutoff valve
№ Circuit protected Amp

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

54 Valid for engines 611/612: CDI control unit 7.5

Valid for engine 611/612 (up to 30.11.04): Vent line heater element

55 Steering angle sensor 7.5

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

56 ESP and BAS control unit 5

Stop light switch

57 Steering 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
№ Circuit protected Amp

58 Valid for transmission 716: SEQ hydraulic pump 40

59 ESP and BAS control unit 50

60 ESP and BAS control unit 40

61 Valid for transmission 716: Automated manual transmission control unit 15

62 Data link connector 5

Light switch module
Stop light switch

63 Light switch module 5

64 Radio 10
Radio and navigation unit
COMAND operating, display and control unit

65 Valid for engine 112/113: Electric air pump 40

Relay
№ Circuit protected Amp

I Fanfare horn system relay

K Terminal 87 relay, chassis

L Wiper speed 1 and 2 relay

M Terminal 15R relay

N SEQ [ASG] pump control relay (with Sequentronic automated manual transmission (ASG))

O Air pump relay (engines 112, 113, 271 only)

P Terminal 15 relay

Q Wiper ON/OFF relay

R Terminal 87 relay, engine

S Starter relay

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 Front Prefuse Box

№ Circuit protected Amp

1 Interior fusebox 125

2 Luggage fusebox 200

 № Circuit protected Amp

3 Additional fuse holder 1, spare wheel well 125

4 Engine fusebox 200

5 Engine and AC electric suction fan with integrated control 125

Valid for diesel engines: Glow output stage

6 Engine fusebox 60

Luggage Compartment Fuse Box

Fuse box location

The fuse box is located in the luggage compartment (on the left-side), behind the cover.

Fuse box diagram

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Assignment of the fuses and relay in the trunk

№ Circuit protected Amp

1 Front passenger front seat adjustment control unit with memory 30

Front passenger partially-electric seat adjustment switch

2 Driver front seat adjustment control unit with memory 30

Driver partially-electric seat adjustment switch

3 Dome lamp 7.5

 № Circuit protected Amp

Right luggage compartment lamp

Left luggage compartment lamp
STH radio remote control receiver

3 TV tuner (up to 29.2.04) 20

TV tuner (MOST) (as of 1.4.04)

4 Fuel pump relay (N10/2kA) 20

5 Valid for engine 112.961 (up to 31.3.04): Charge air cooler circulation pump 20

Valid without engine 112.961: Backup relay 2

6 Spare 25

7 Backup relay 1 7.5

8 Amplifier module, window antenna 7,5

Alarm signal horn (H3) ATA [EDW] inclination sensor

9 Overhead control panel control unit 25

 № Circuit protected Amp

10 Heated rear window 40

11 Spare 20

12 Interior socket 15
Valid for model 203.0 USA version (up to 31.3.04): Power outlet

13 Multicontour seat pneumatic pump 5

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.

14 Tailgate wiper motor 15

15 Fuel filler cap polarity change relay 1 10

Fuel filler cap polarity change relay 2

16 Voice control system control unit 20

17 Trailer recognition control unit 20

 № Circuit protected Amp

18 Trailer hitch socket (13-pin) 20

19 Multicontour seat pneumatic pump 20

20 Rear window roller blind relay 15

Valid for model 203.2/7 USA version: Power outlet

Relay

A Fuel pump relay

B Relay 2, terminal 15R

C Reserve relay 2

D Reserve relay 1

E Rear window defroster relay

F Relay 1, terminal 15R

№ Circuit protected Amp

G Filler cap relay, polarity reverser 1

H Filler cap relay, polarity reverser 2