Mercedes-Benz C-Class (W204; 2008-2014) fuses and relays

 

In this article, we consider the third-generation Mercedes-Benz C-Class (W204), produced from 2007 to 2014. Here you will find fuse box diagrams of Mercedes-Benz C180, C200, C220, C250, C300, C350, C63 2008, 2009, 2010, 2011, 2012, 2013 and 2014, get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse layout) and relay.

Fuse Layout Mercedes-Benz C-Class 2008-2014


Cigar lighter (power outlet) fuses in the Mercedes-Benz C-Class are the fuse #9 (Glove compartment power outlet) in the Engine Compartment fuse box, and fuses #71 (Front cigarette lighter, Front interior power outlet), #72 (Cargo area connector box 115 V power outlet), #76 (interior power outlet) in the Luggage compartment fuse box.


Instrument Panel Fuse Box

Fuse box location

The fuse box is located on the driver’s side of the instrument panel, behind the cover.The location of the fuses in the passenger compartment: Mercedes-Benz C-Class (W204; 2008-2014)

Fuse box diagram

Instrument panel fuse box diagram: Mercedes-Benz C-Class (2008-2014)


 

Assignment of the fuses in the instrument panel

Fused function Amp
116 Driver seat control unit 30
117 Adaptive damping system control unit 15
118 Spare
119 Rear blower motor
AMG Performance Media control unit (valid as of 1.6.12)
7.5
120 Spare
121 Spare .
122 Spare
123 Steering column tube module control unit 10
124 Spare .
125 Spare
126 Front passenger seat control unit 30
127 Spare
128 Spare .
129 Valid for engine 156: Oil cooler fan motor relay 20
130 Spare .
131 Spare
132 Spare
133 Spare .
134 Spare
135 Spare

Engine Compartment Fuse Box

Fuse box location

The fuse box is located in the engine compartment (left-side), under the cover.The location of the fuses in the engine compartment: Mercedes-Benz C-Class (W204; 2008-2014)

Fuse box diagram

Under-hood fuse box diagram: Mercedes-Benz C-Class (2008-2014)

 

Assignment of the fuses and relay in the engine compartment

Fused function Amp
1 Electronic Stability Program control unit 25
2 Left front door control unit 30
3 Valid up to 31.3.10:
Right front door control unit
Valid as of 1.4.10 with model 204.0/2/9:
Right rear door control unit
30
4 up to 31.8.08:
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
7.5
4 Valid for diesel engine as of 1.9.08:
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
20
5 Rear SAM control unit with fuse and relay module
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
7.5
6 Valid for diesel engine:
ME-SFI [ME] control unit
Valid for gasoline engine:
CDI control unit
10
7 Starter 20
8 Supplemental restraint system control unit 7.5
9 Glove compartment power outlet 15
10 Wiper motor 30
11 Audio/COMAND display
Audio/COMAND control panel
Holder for navigation module
7.5
12 Automatic air conditioning control and operating unit
Upper control panel control unit
7.5
13 Steering column module control unit
Multifunction camera
7.5
14 Electronic Stability Program control unit 7.5
14 Headlamp control unit 20
15 Supplemental restraint system control unit 7.5
16 Diagnostic connector (up to 31.5.09)
Mobile phone electrical connector
Valid for transmission 722: Electronic selector lever module control unit
5
16 ECO start/stop function:
Electric transmission oil pump
20
17 Panoramic sliding roof control module
Overhead control panel control unit
30
18 Valid up to 30.11.09:
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
7.5
19 Electric steering lock control unit
Electronic ignition lock control unit
20
20 Electronic Stability Program control unit 40
21 Stop lamp switch
Glove compartment lamp switch
Front passenger seat occupied recognition and ACSR
Electronic Toll Collection preinstallation electrical fuse (Japan)
7.5
22 Combustion engine fan motor and air conditioning with integrated control
Electrical connector for interior harness and engine wiring harness
15
23 Electrical connector for interior harness and engine wiring harness
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
20
24 Electrical connector for interior harness and engine wiring harness
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
15
25 Valid for engine 156, 271, 272, 274, 276:
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
15
26 Radio Radio with auto pilot system
COMAND controller unit
20
27 Electric steering lock control unit
Electronic ignition lock control unit
Valid for diesel engine:
CDI control unit
Valid for gasoline engine:
ME-SFI [ME] control unit
7.5
28 Instrument cluster 7.5
29 Right front lamp unit 10
30 Left front lamp unit
Valid for engine 642: Electrical connector for interior harness and engine wiring harness
10
31A Left fanfare horn
Right fanfare horn
15
31B Left fanfare horn
Right fanfare horn
15
32 Valid for engine 156, 271, 272, 276: Electric air pump 40
32 Valid for engine 156: Oil cooler fan motor 20
33 Valid for transmission 722.6: Electronic transmission-control control unit
Valid for transmission 722.9: Fully integrated transmission control controller unit
10
34 Valid for engine 271, 272 as of 1.9.08: Fuel pump control unit
Valid for engine 156 as of 1.9.08: Left fuel pump control unit, Right fuel pump control unit
7.5
35 Valid as of 1.3.11: Electronic Stability Program control unit 5
36 Valid as of 1.3.11: DISTRONIC electric controller unit
Valid for model 204.902/982/984: Electrohydraulic power steering
7.5
Relay
J Circuit 15 relay
K Terminal 15R relay
L Backup relay
M Circuit 50 starter relay
O Engine circuit 87 relay
O Fanfare horn relay
P Valid for engine 156, 272, 276: Secondary air injection relay
Q Backup relay
R Chassis circuit 87 relay

Front Pre-fuse Box (up to 2010)

Front Prefuse Box (up to 2010)

Fused function Amp
88 Pyrofuse: Alternator, Starter
89 Front SAM control unit with fuse and relay module 125
90 Rear SAM control unit with fuse and relay module 40
91 Combustion engine fan motor and air conditioning with integrated control 80
100 Air conditioner housing 40
101 Valid for gasoline engine: Front SAM control unit with fuse and relay module 60
103 Valid for diesel engine: PTC heater booster 150
104 Interior fuse box 70
105 Front SAM control unit with fuse and relay module 100
106 Rear SAM control unit with fuse and relay module 150
107 Spare
108 Spare
109 Spare .
110 Spare

Front Pre-fuse Box (as of 2010)

without ECO start/stop

with ECO start/stop

Front Prefuse Box (as of 2010)

Fused function Amp
150 without ECO start/stop: Pyrofuse 88 400
150 ECO start/stop: Alternator, Starter 200
151 Combustion engine fan motor and air conditioning with integrated control 100
152 Front SAM control unit with fuse and relay module 150
153 without ECO start/stop: Spare 100
153 ECO start/stop function and front battery position: Front SAM control unit with fuse and relay module 60
154 ECO start/stop function and front battery position: Front SAM control unit with fuse and relay module 60
154 Valid for diesel engine and ECO start/stop: PTC heater booster 150
155 without ECO start/stop: Spare 50
155 ECO start/stop function: Spare 100
156 Valid for diesel engine without ECO start/stop: PTC heater booster 150
156 ECO start/stop function: Front SAM control unit with fuse and relay module 100
157 Valid for model 204.902/982/984 without ECO start/stop function: Electrohydraulic power steering
ECO start/stop:
Spare
100
158 without ECO start/stop: Blower regulator 50
158 ECO start/stop: Rear SAM control unit with fuse and relay module 150
159 Special-purpose vehicle multifunction control unit 50
159 ECO start/stop: Additional battery relay 200
160 without ECO start/stop: Spare 60
160 ECO start/stop: Blower regulator 50
161 without ECO start/stop: Front SAM control unit with fuse and relay module 100
161 Special-purpose vehicle multifunction control unit 50
162 without ECO start/stop: Spare 100
162 ECO start/stop: Spare 60
163 without ECO start/stop: Rear SAM control unit with fuse and relay module 150
164 without ECO start/stop function: Rear SAM control unit with fuse and relay module 80

Luggage Compartment Fuse Box

Fuse box location

It is located in the luggage compartment (on the right-side), behind the cover.The location of the fuses in the trunk: Mercedes-Benz C-Class (W204; 2008-2014)

Fuse box diagram

Version 1Trunk fuse box diagram (version 1): Mercedes-Benz C-Class (2008-2014)

Version 2Trunk fuse box diagram (version 2): Mercedes-Benz C-Class (2008-2014)

 

Assignment of the fuses and relay in the trunk

Fused function Amp
37 as of 2008: Driver seat NECK-PRO head restraint solenoid, Front passenger seat NECK-PRO head restraint solenoid 5
37 up to 2008: Driver seat NECK-PRO head restraint solenoid, Front passenger seat NECK-PRO head restraint solenoid 7.5
38 Tailgate wiper motor 15
39 Valid for model 204.0/2/9 except vehicles for Great Britain up to 31.5.09: Left rear door control unit 30
40 Spare
41 Valid for model 204.0/2/9 up to 31.3.10: Right rear door control unit
Valid as of 1.4.10 Right front door control unit
30
42 Valid for gasoline engine or engine 642 as of 1.12.09 or engine 651 as of 1.6.09: Fuel pump control unit 25
42 Valid for engine 646 or engine 642 up to 30.11.09 or engine 651 up to 31.5.09: Fuel pump
Valid for gasoline engine (up to 2009): Fuel pump control unit
20
43 Valid as of 1.6.09 with automatic air conditioning: Rear blower motor 5
44 Switch group, right front seat setting
Front passenger seat partially electric seat adjustment switch
30
45 Left front seat adjustment switch group
Driver seat partially electric seat adjustment switch
30
46 Antenna amplifier for rear window FM antenna
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
7.5
47 Spare
48 Spare
49 Rear window heater 40
50 Right front reversible emergency tensioning retractor 50
51 Left front reversible emergency tensioning retractor (A76) 50
52 Spare
53 as of 2008:  Trailer recognition control unit  15
53 up to 2008:  Trailer recognition control unit  30
54 up to 31.5.09: Trailer recognition control unit
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
7.5
54 as of 1.6.09: Trailer recognition control unit 15
55 Valid as of 1.6.09: AdBlue 5
56 Trailer recognition control unit
Trailer socket
15
56 Valid for model 204.077/277/377 up to 31.5.09:
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
5
57 Trailer recognition control unit 20
58 as of 2008: Trailer recognition control unit 20
58 up to 2008: Trailer recognition control unit 30
59 as of 2008:
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
5
59 up to 2008:
PARKTRONIC control unit
Radar sensors control unit
7.5
60 Multicontour seat pneumatic pump 7.5
61 Liftgate-control control unit 40
62 Driver seat control unit 30
63 Front passenger seat control unit 30
64 DC/AC converter control unit 25
65 Adaptive damping system control unit Steering column tube module control unit 15
66 Spare
67 as of 2008: Sound system amplifier control unit 30
67 up to 2008: Sound system amplifier control unit 40
68 Spare .
69 Rear bass speaker amplifier 20
70 Tire pressure monitor control unit 5
71 Front cigarette lighter with ashtray illumination
Front vehicle interior power outlet
15
72 Cargo area connector box 115 V power outlet 15
73 Diagnostic connector (as of 1.6.09)
Stationary heater radio remote control receiver
Valid for engine 156 as of 1.7.11: Transmission mode control unit
7.5
74 KEYLESS-GO control unit 15
75 Stationary heater unit 20
76 Vehicle interior power outlet 15
77 Weight Sensing System (WSS) control unit 7.5
78 Left front seat ventilation blower regulator
Right front seat ventilation blower regulator
7.5
79 Parking system control unit 5
80 Video and radar sensor system control unit
Parking system control unit
7.5
81 Media interface control unit 5
82 Cellular telephone system compensator UMTS
TV tuner control unit (up to 31.5.09; Japan)
Digital TV tuner (up to 31.5.09; Japan)
5
83 Electronic Toll Collection control unit (Japan)
Emergency call system control unit
Reversing camera
Left rear display
Right rear display
7.5
84 Satellite digital audio radio (SDAR) control unit
SDAR/high definition tuner control unit
Digital Audio Broadcasting control unit
Backup camera power supply module
Backup camera control unit
360° camera control unit
7.5
85 TV tuner control unit (up to 31.5.09; Japan)
Digital TV tuner (as of 1.6.09; Japan)
7.5
86 DVD player 7.5
87 Emergency call system control unit 7.5
88 Valid as of 1.6.09 Spare
89 Valid as of 1.6.09: Trailer recognition control unit
Valid as of 1.6.09 with engine 156: Oil cooler fan motor relay
20
90 Valid as of 1.6.09 AdBlue® fuse block, AdBlue supply relay 40
91 DC/AC converter control unit 25
91 ECO start/stop: Transmission oil auxiliary pump control unit
Valid for engine 642: Vent line heater element
20
92 Valid as of 1.6.09 Spare
Relay
A Terminal 15 relay
B Circuit 15R relay (1)
C Heated rear window relay
D Valid for diesel engine: Fuel pump relay
E Tailgate windshield wiper relay
F Seat adjustment relay
G Circuit 15R relay (2)

Rear Pre-fuse box

Fused function Amp
111 Valid for gasoline engine: ME-SFI [ME] control unit
Valid for diesel engine: CDI control unit
60
112 Special-purpose vehicle multifunction control unit 80
113 Valid for engine 156: Left fuel pump control unit, Right fuel pump control unit 40
114 Spare
115 Special-purpose vehicle multifunction control unit 100


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