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

Fuse box diagram (location and assignment of electrical fuses and relays) for Mercedes-Benz C-Class (W204; 2008, 2009, 2010, 2011, 2012, 2013, 2014).

Fuse box diagram: Mercedes-Benz C-Class
(W204; 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

The fuse box is located on the driver’s side of the instrument panel, behind the coverThe 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 Fuse Box
Fused functionA
116Driver seat control unit30
117Adaptive damping system control unit15
118Spare-
119Rear blower motor
AMG Performance Media control unit (valid as of 1.6.12)
7.5
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-

Engine Compartment Fuse Box

The fuse box is located in the engine compartment (left-side), under the coverThe 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 Fuse Box
Fused functionA
1Electronic Stability Program control unit25
2Left front door control unit30
3Valid 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
4up 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
4Valid 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
5Rear 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
6Valid for diesel engine:
ME-SFI [ME] control unit
Valid for gasoline engine:
CDI control unit
10
7Starter20
8Supplemental restraint system control unit7.5
9Glove compartment power outlet15
10Wiper motor30
11Audio/COMAND display
Audio/COMAND control panel
Holder for navigation module
7.5
12Automatic air conditioning control and operating unit
Upper control panel control unit
7.5
13Steering column module control unit
Multifunction camera
7.5
14Electronic Stability Program control unit7.5
14Headlamp control unit20
15Supplemental restraint system control unit7.5
16Diagnostic connector (up to 31.5.09)
Mobile phone electrical connector
Valid for transmission 722: Electronic selector lever module control unit
5
16ECO start/stop function:
Electric transmission oil pump
20
17Panoramic sliding roof control module
Overhead control panel control unit
30
18Valid 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
19Electric steering lock control unit
Electronic ignition lock control unit
20
20Electronic Stability Program control unit40
21Stop lamp switch
Glove compartment lamp switch
Front passenger seat occupied recognition and ACSR
Electronic Toll Collection preinstallation electrical fuse (Japan)
7.5
22Combustion engine fan motor and air conditioning with integrated control
Electrical connector for interior harness and engine wiring harness
15
23Electrical 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
24Electrical 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
25Valid 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
26Radio Radio with auto pilot system
COMAND controller unit
20
27Electric 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
28Instrument cluster7.5
29Right front lamp unit10
30Left front lamp unit
Valid for engine 642: Electrical connector for interior harness and engine wiring harness
10
31ALeft fanfare horn
Right fanfare horn
15
31BLeft fanfare horn
Right fanfare horn
15
32Valid for engine 156, 271, 272, 276: Electric air pump40
32Valid for engine 156: Oil cooler fan motor20
33Valid for transmission 722.6: Electronic transmission-control control unit
Valid for transmission 722.9: Fully integrated transmission control controller unit
10
34Valid 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
35Valid as of 1.3.11: Electronic Stability Program control unit5
36Valid as of 1.3.11: DISTRONIC electric controller unit
Valid for model 204.902/982/984: Electrohydraulic power steering
7.5
Relay
JCircuit 15 relay
KTerminal 15R relay
LBackup 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

Front Pre-fuse Box (up to 2010)

Front Prefuse Box (up to 2010)
NO.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-

Front Pre-fuse Box (as of 2010)

without ECO start/stop

with ECO start/stop

Front Prefuse Box (as of 2010)
Fused functionA
150without ECO start/stop: Pyrofuse 88400
150ECO start/stop: Alternator, Starter200
151Combustion engine fan motor and air conditioning with integrated control100
152Front SAM control unit with fuse and relay module150
153without ECO start/stop: Spare100
153ECO 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
154Valid for diesel engine and ECO start/stop: PTC heater booster150
155without ECO start/stop: Spare50
155ECO start/stop function: Spare100
156Valid for diesel engine without ECO start/stop: PTC heater booster150
156ECO 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 steering
ECO start/stop:
Spare
100
158without ECO start/stop: Blower regulator50
158ECO start/stop: Rear SAM control unit with fuse and relay module150
159Special-purpose vehicle multifunction control unit50
159ECO start/stop: Additional battery relay200
160without ECO start/stop: Spare60
160ECO start/stop: Blower regulator50
161without ECO start/stop: Front SAM control unit with fuse and relay module100
161Special-purpose vehicle multifunction control unit50
162without ECO start/stop: Spare100
162ECO 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

The fuse box is located in the luggage compartment (on the right-side), behind the coverThe 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 functionA
37as of 2008: Driver seat NECK-PRO head restraint solenoid, Front passenger seat NECK-PRO head restraint solenoid5
37up to 2008: Driver seat NECK-PRO head restraint solenoid, Front passenger seat NECK-PRO head restraint solenoid7.5
38Tailgate wiper motor15
39Valid for model 204.0/2/9 except vehicles for Great Britain up to 31.5.09: Left rear door control unit30
40Spare-
41Valid 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
42Valid for gasoline engine or engine 642 as of 1.12.09 or engine 651 as of 1.6.09: Fuel pump control unit25
42Valid 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
43Valid as of 1.6.09 with automatic air conditioning: Rear blower motor5
44Switch group, right front seat setting
Front passenger seat partially electric seat adjustment switch
30
45Left front seat adjustment switch group
Driver seat partially electric seat adjustment switch
30
46Antenna 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
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 unit 15
53up to 2008:  Trailer recognition control unit 30
54up 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
54as of 1.6.09: Trailer recognition control unit15
55Valid as of 1.6.09: AdBlue5
56Trailer recognition control unit
Trailer socket
15
56Valid 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
57Trailer recognition control unit20
58as of 2008: Trailer recognition control unit20
58up to 2008: Trailer recognition control unit30
59as 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
59up to 2008:
PARKTRONIC control unit
Radar sensors control unit
7.5
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 unit Steering column tube module control unit15
66Spare-
67as of 2008: Sound system amplifier control unit30
67up to 2008: Sound system amplifier control unit40
68Spare.
69Rear bass speaker amplifier20
70Tire pressure monitor control unit5
71Front cigarette lighter with ashtray illumination
Front vehicle interior power outlet
15
72Cargo area connector box 115 V power outlet15
73Diagnostic 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
74KEYLESS-GO control unit15
75Stationary heater unit20
76Vehicle interior power outlet15
77Weight Sensing System (WSS) control unit7.5
78Left front seat ventilation blower regulator
Right front seat ventilation blower regulator
7.5
79Parking system control unit5
80Video and radar sensor system control unit
Parking system control unit
7.5
81Media interface control unit5
82Cellular telephone system compensator UMTS
TV tuner control unit (up to 31.5.09; Japan)
Digital TV tuner (up to 31.5.09; Japan)
5
83Electronic Toll Collection control unit (Japan)
Emergency call system control unit
Reversing camera
Left rear display
Right rear display
7.5
84Satellite 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
85TV tuner control unit (up to 31.5.09; Japan)
Digital TV tuner (as of 1.6.09; Japan)
7.5
86DVD player7.5
87Emergency call system control unit7.5
88Valid as of 1.6.09 Spare-
89Valid as of 1.6.09: Trailer recognition control unit
Valid as of 1.6.09 with engine 156: Oil cooler fan motor relay
20
90Valid as of 1.6.09 AdBlue® fuse block, AdBlue supply relay40
91DC/AC converter control unit25
91ECO start/stop: Transmission oil auxiliary pump control unit
Valid for engine 642: Vent line heater element
20
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 Pre-fuse box

Rear prefuse box
Fused functionA
111Valid for gasoline engine: ME-SFI [ME] control unit
Valid for diesel engine: CDI control unit
60
112Special-purpose vehicle multifunction control unit80
113Valid for engine 156: Left fuel pump control unit, Right fuel pump control unit40
114Spare-
115Special-purpose vehicle multifunction control unit100
Mercedes-Benz C-Class (W204; 2008-2014) fuses and relays July 5, 2019 admin