Mercedes-Benz C-Class W204 (2007-2014) Fuse Diagram

Fuse box diagram (fuse layout), location, and assignment of fuses and relays Mercedes-Benz C-Class W204 (C180, C200, C220, C230, C250, C280, C300, C320, C350 & C63) (2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014).

Mercedes-Benz C-Class W204 (2007-2014)

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 allocation chart is located in the vehicle tool kit in the storage compartment under the trunk floor.

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, remove the SmartKey from the ignition lock, 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

It is located on the driver’s side of the dashboard.

Instrument Panel Fuse Box Location

  • To open: pull out cover (1) slightly at the bottom in the direction of the arrow (3). Do not use a pointed object such as a screwdriver to open the cover in the dashboard. You could damage the dashboard or the cover.
  • Pull cover (1) outwards in the direction of the arrow (2) and remove it.
  • To close: clip in cover (1) on the front of the dashboard.
  • Fold cover (1) inwards until it engages.

Instrument Panel Fuse Box Diagram

Fused functionA
116Driver seat control unit30
117Adaptive damping system control unit15
118Spare-
119Rear blower motor7.5
AMG Performance Media control unit (valid as of 1.6.12)
120Spare-
121Spare-
122Spare-
123Steering column tube module control unit10
124Spare-
125Spare-
126Front passenger seat control unit30
127Spare-
128Spare-
129Valid for engine 156: Oil cooler fan motor relay20
130Spare-
131Spare-
132Spare-
133Spare-
134Spare-
135Spare-

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Engine Compartment Fuse Box

The fuse box is located on the left-hand side of the vehicle, when viewed in the direction of travel.

Make sure that the windshield wipers are switched off and that the SmartKey is removed from the ignition lock before you open the cover of the fuse box. Otherwise, the windshield wipers and the wiper rods above the cover could be set in motion. This could lead to you or others being injured by the wiper rods.

Engine Compartment Fuse Box Location

  • Open the hood.
  • Remove any existing moisture from the fuse box using a dry cloth.
  • Take lines (2) from the guides.
  • To open: open clamps (1).
  • Remove the fuse box cover forwards.

!!! Make sure that no moisture can enter the fuse box when the cover is open.

  • To close: check whether the rubber seal is lying correctly in the cover.
  • Insert the cover at the rear of the fuse box into the retainer.
  • Fold-down the cover and close clamps (1).
  • Secure lines (2) in the guides.

!!! The cover must be seated properly, otherwise, moisture or dirt could impair the function of the fuses.

  • Close the hood.

Engine Compartment Fuse Box Diagram

Fused functionA
1Electronic Stability Program control unit25
2Left front door control unit30
3Valid up to 31.3.10:30
   Right front door control unit
Valid as of 1.4.10 with model 204.0/2/9:
   Right rear door control unit
4up to 31.8.08:7.5
   Fuel pump control unit
Valid for engine 156 up to 31.8.08:
   Left fuel pump control unit
   Right fuel pump control unit
Valid for engine 642, engine 651:
   Fuel filter condensation sensor with heating element
Valid for engine 651 up to 31.5.10, engine 646:
Control unit for fuel filter condensation sensor with heating element
Valid for diesel engine as of 1.9.08:20
   Fuel filter condensation sensor with heating element
Valid for engine 276 (USA, South Korea):
   Activated charcoal canister shutoff valve
Valid for model 204.0/2/3 as of 1.3.11, 204.9 as of 1.6.12:
   Headlamp control unit
5Rear SAM control unit with fuse and relay module7.5
Valid as of 1.6.10
   Exterior lights switch
Valid for engine 156 Black Series as of 1.7.11:
   Rear axle differential coolant circuit relay
6Valid for diesel engine:10
   ME-SFI [ME] control unit
Valid for gasoline engine:
   CDI control unit
7Starter20
8Supplemental restraint system control unit7.5
9Glove compartment power outlet15
10Wiper motor30
11Audio/COMAND display7.5
Audio/COMAND control panel
Holder for navigation module
12Automatic air conditioning control and operating unit7.5
Upper control panel control unit
13Steering column module control unit7.5
Multifunction camera
14Electronic Stability Program control unit7.5
Headlamp control unit20
15Supplemental restraint system control unit7.5
16Diagnostic connector (up to 31.5.09)5
Mobile phone electrical connector
Valid for transmission 722: Electronic selector lever module control unit
ECO start/stop function:20
   Electric transmission oil pump
17Panoramic sliding roof control module30
Overhead control panel control unit
18Valid up to 30.11.09:7.5
   Exterior lights switch
Valid for model 204.0/2 as of 1.3.11, model 204.3:
   Upper control panel control unit
Valid for model 204.0/2 up to 28.2.11, model 204.9:
   Instrument panel climate control LIN positive line connector sleeve
Vehicle interior and harness for taillamp electrical connector
19Electric steering lock control unit20
Electronic ignition lock control unit
20Electronic Stability Program control unit40
21Stop lamp switch7.5
Glove compartment lamp switch
Front passenger seat occupied recognition and ACSR
Electronic Toll Collection preinstallation electrical fuse (Japan)
22Combustion engine fan motor and air conditioning with integrated control15
Electrical connector for interior harness and engine wiring harness
23Electrical connector for interior harness and engine wiring harness20
Valid for diesel engine:
   Rear SAM control unit with fuse and relay module
   CDI control unit
   Terminal 87 connector sleeve
Valid for engine 271:
   Terminal 87 M1e connector sleeve
Valid for engine 272:
   Circuit 87 M1i connector sleeve
24Electrical connector for interior harness and engine wiring harness15
Interior and engine wiring harness electrical connector
Valid for engine 642:
   Radiator shutters actuator
Valid for engine 272:
   Terminal 87 M1e connector sleeve
Valid for diesel engine:
   Terminal 87 connector sleeve
Valid for engine 646:
   CDI control unit
25Valid for engine 156, 271, 272, 274, 276:15
   ME-SFI [ME] control unit
Valid for diesel engine:
   Oxygen sensor upstream of catalytic converter
Valid as of 1.6.10 for model 204.3 with engine 651 Sport Edition:
   Exhaust system sound generator control unit
26Radio20
Radio with auto pilot system
COMAND controller unit
27Electric steering lock control unit7.5
Electronic ignition lock control unit
Valid for diesel engine:
   CDI control unit
Valid for gasoline engine:
   ME-SFI [ME] control unit
28Instrument cluster7.5
29Right front lamp unit10
30Left front lamp unit10
Valid for engine 642:
   Electrical connector for interior harness and engine wiring harness
31ALeft fanfare horn15
Right fanfare horn
31BLeft fanfare horn15
Right fanfare horn
32Valid for engine 156, 271, 272, 276:40
   Electric air pump
Valid for engine 156:20
   Oil cooler fan motor
33Valid for transmission 722.6:10
   Electronic transmission-control control unit
Valid for transmission 722.9:
   Fully integrated transmission control controller unit
34Valid for engine 271, 272 as of 1.9.08:7.5
   Fuel pump control unit
Valid for engine 156 as of 1.9.08:
   Left fuel pump control unit
   Right fuel pump control unit
35Valid as of 1.3.11:5
   Electronic Stability Program control unit
36Valid as of 1.3.11:7.5
   DISTRONIC electric controller unit
Valid for model 204.902/982/984:
   Electrohydraulic power steering
Relay
JCircuit 15 relay
KTerminal 15R relay
LLBackup relay
MCircuit 50 starter relay
OEngine circuit 87 relay
OFanfare horn relay
PValid for engine 156, 272, 276: Secondary air injection relay
QBackup relay
RChassis circuit 87 relay

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Front Prefuse Box

up to 2010

Front Prefuse Box (up to 2010)

Fused functionA
88Pyrofuse:
   Alternator
   Starter
89Front SAM control unit with fuse and relay module125
90Rear SAM control unit with fuse and relay module40
91Combustion engine fan motor and air conditioning with integrated control80
100Air conditioner housing40
101Valid for gasoline engine: Front SAM control unit with fuse and relay module60
103Valid for diesel engine: PTC heater booster150
104Interior fuse box70
105Front SAM control unit with fuse and relay module100
106Rear SAM control unit with fuse and relay module150
107Spare-
108Spare-
109Spare-
110Spare-
as of 2010

Front Prefuse Box (as of 2010)

Fused functionA
150without ECO start/stop: Pyrofuse 88400
ECO start/stop:200
   Alternator
   Starter
151Combustion engine fan motor and air conditioning with integrated control100
152Front SAM control unit with fuse and relay module150
153without ECO start/stop: Spare100
ECO start/stop function and front battery position: Front SAM control unit with fuse and relay module60
154ECO start/stop function and front battery position: Front SAM control unit with fuse and relay module60
Valid for diesel engine and ECO start/stop: PTC heater booster150
155without ECO start/stop: Spare50
ECO start/stop function: Spare100
156Valid for diesel engine without ECO start/stop: PTC heater booster150
ECO start/stop function: Front SAM control unit with fuse and relay module100
157Valid for model 204.902/982/984 without ECO start/stop function: Electrohydraulic power steering100
ECO start/stop: Spare
158without ECO start/stop: Blower regulator50
ECO start/stop: Rear SAM control unit with fuse and relay module150
159Special-purpose vehicle multifunction control unit50
ECO start/stop: Additional battery relay200
160without ECO start/stop: Spare60
ECO start/stop: Blower regulator50
161without ECO start/stop: Front SAM control unit with fuse and relay module100
Special-purpose vehicle multifunction control unit50
162without ECO start/stop: Spare100
ECO start/stop: Spare60
163without ECO start/stop: Rear SAM control unit with fuse and relay module150
164without ECO start/stop function: Rear SAM control unit with fuse and relay module80

Luggage Compartment Fuse Box

It is in the trunk on the right-hand side of the vehicle, when viewed in the direction of travel.

Luggage Compartment Fuse Box Location

  • Open the trunk lid.
  • To open: turn rotary catch (1) clockwise.
  • Open cover (2) downwards in the direction of the arrow.

Luggage Compartment Fuse Box Diagram

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Fused functionA
37as of 2008:5
   Driver seat NECK-PRO head restraint solenoid
   Front passenger seat NECK-PRO head restraint solenoid
up to 2008:7.5
   Driver seat NECK-PRO head restraint solenoid
   Front passenger seat NECK-PRO head restraint solenoid
38Tailgate wiper motor15
39Valid for model 204.0/2/9 except vehicles for Great Britain up to 31.5.09:30
   Left rear door control unit
40Spare-
41Valid for model 204.0/2/9 up to 31.3.10:30
   Right rear door control unit
Valid as of 1.4.10
   Right front door control unit
42Valid for gasoline engine or engine 642 as of 1.12.09 or engine 651 as of 1.6.09:25
   Fuel pump control unit
Valid for engine 646 or engine 642 up to 30.11.09 or engine 651 up to 31.5.09:20
   Fuel pump
Valid for gasoline engine (up to 2009):
   Fuel pump control unit
43Valid as of 1.6.09 with automatic air conditioning:5
   Rear blower motor
44Switch group, right front seat setting30
Front passenger seat partially electric seat adjustment switch
45Left front seat adjustment switch group30
Driver seat partially electric seat adjustment switch
46Antenna amplifier for rear window FM antenna7.5
Alarm siren
Interior protection and tow-away protection control unit
Rear window antenna amplifier 1
TV 1 antenna amplifier and DAB Band III
DAB band III antenna
TV 2 antenna amplifier and KEYLESS-GO
KEYLESS-GO antenna amplifier
47Spare-
48Spare-
49Rear window heater40
50Right front reversible emergency tensioning retractor50
51Left front reversible emergency tensioning retractor (A76)50
52Spare-
53as of 2008: Trailer recognition control unit15
up to 2008: Trailer recognition control unit30
54up to 31.5.09: Trailer recognition control unit7.5
Valid for model 204.075/077/275/277:
   Driver seat lumbar support and side bolster adjustment switch group
   Front passenger seat lumbar support and side bolster adjustment switch group
   Front passenger seat AMG valve block
   Driver seat AMG valve block
as of 1.6.09: Trailer recognition control unit15
55Valid as of 1.6.095
   AdBlue
56Trailer recognition control unit15
Trailer socket
Valid for model 204.077/277/377 up to 31.5.09:5
   Driver seat lumbar support and side bolster adjustment switch group
   Front passenger seat lumbar support and side bolster adjustment switch group
   Front passenger seat AMG valve block
   Driver's seat AMG valve block
57Trailer recognition control unit20
58as of 2008: Trailer recognition control unit20
up to 2008: Trailer recognition control unit30
59as of 2008:5
   Parking system control unit
   Left front bumper DISTRONIC (DTR) sensor
   Right front bumper DISTRONIC (DTR) sensor
   Intelligent radar sensor for left rear bumper
   Intelligent radar sensor for right rear bumper
up to 2008: 7.5
   PARKTRONIC control unit
   Radar sensors control unit
60Multicontour seat pneumatic pump7.5
61Liftgate-control control unit40
62Driver seat control unit30
63Front passenger seat control unit30
64DC/AC converter control unit25
65Adaptive damping system control unit15
Steering column tube module control unit
66Spare-
67as of 2008: Sound system amplifier control unit30
up to 2008: Sound system amplifier control unit40
68Spare-
69Rear bass speaker amplifier20
70Tire pressure monitor control unit5
71Front cigarette lighter with ashtray illumination15
Front vehicle interior power outlet
72Cargo area connector box15
115 V power outlet
73Diagnostic connector (as of 1.6.09)7.5
Stationary heater radio remote control receiver
Valid for engine 156 as of 1.7.11:
   Transmission mode control unit
74KEYLESS-GO control unit15
75Stationary heater unit20
76Vehicle interior power outlet15
77Weight Sensing System (WSS) control unit7.5
78Left front seat ventilation blower regulator7.5
Right front seat ventilation blower regulator
79Parking system control unit5
80Video and radar sensor system control unit7.5
Parking system control unit
81Media interface control unit5
82Cellular telephone system compensator UMTS5
TV tuner control unit (up to 31.5.09; Japan)
Digital TV tuner (up to 31.5.09; Japan)
83Electronic Toll Collection control unit (Japan)7.5
Emergency call system control unit
Reversing camera
Left rear display
Right rear display
84Satellite digital audio radio (SDAR) control unit7.5
SDAR/high definition tuner control unit
Digital Audio Broadcasting control unit
Backup camera power supply module
Backup camera control unit
360° camera control unit
85TV tuner control unit (up to 31.5.09; Japan)7.5
Digital TV tuner (as of 1.6.09; Japan)
86DVD player7.5
87Emergency call system control unit7.5
88Valid as of 1.6.09-
   Spare
89Valid as of 1.6.09:20
   Trailer recognition control unit
Valid as of 1.6.09 with engine 156:
   Oil cooler fan motor relay
90Valid as of 1.6.0940
   AdBlue fuse block
   AdBlue supply relay
91DC/AC converter control unit25
ECO start/stop: Transmission oil auxiliary pump control unit20
Valid for engine 642: Vent line heater element
92Valid as of 1.6.09-
   Spare
Relay
ATerminal 15 relay
BCircuit 15R relay (1)
CHeated rear window relay
DValid for diesel engine: Fuel pump relay
ETailgate windshield wiper relay
FSeat adjustment relay
GCircuit 15R relay (2)

Rear Prefuse Box

Rear Prefuse Box

Fused functionA
111Valid for gasoline engine: ME-SFI [ME] control unit 60
Valid for diesel engine: CDI control unit
112Special-purpose vehicle multifunction control unit80
113Valid for engine 156:40
   Left fuel pump control unit
    Right fuel pump control unit
114Spare-
115Special-purpose vehicle multifunction control unit100