Mercedes-Benz C-Class (2008 – 2014) Fuse Box Location & Diagrams
This guide helps you quickly find the fuse box locations in the Mercedes-Benz C-Class (2008–2014). It explains each fuse panel layout clearly for easy identification. Perfect for troubleshooting electrical issues or replacing blown fuses.
Fuses
Important safety notes
WARNING 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. Always replace faulty fuses with the specified new fuses having the correct amperage.
- Only use fuses that have been approved for Mercedes-Benzvehicles and which have the correct fuse rating for the system concerned. Otherwise, components or systems could be damaged.
- The fuses in your vehicle serve to close down faulty circuits. If afuse blows, all the components on the circuit and their functions stop operating.
- Blown fuses must be replacedwith fuses of the same rating, which you can recognize by the color and value. The fuse ratings are listed in the fuse allocation chart.
- If a newly inserted fuse also blows, have the cause traced and rectified at a qualified specialist workshop, e.g. an authorized Mercedes-BenzCenter.
Before changing a fuse
- Secure the vehicle against rolling away
- Switch off all electrical consumers.
- Turn the SmartKey to position 0 in the ignition lock and remove it.
or - On vehicles with KEYLESS-GO, make sure the ignition is switched off.
All indicator lamps in the instrument cluster must be off.
The fuses are located in various fuse boxes: - Fuse box in the engine compartment on the
left-hand side of the vehicle, when viewed in the direction of travel - Fuse box in the trunk on the right-hand side of the vehicle, when viewed in the direction of travel
The fuse allocation chart is located in the vehicle tool kit in the stowage compartment under the trunk floor.
Fuse Box Locations
Instrument Panel Fuse Box
The fuse box is located on the driver’s side of the instrument panel, behind the cover.
Engine Compartment Fuse Box
Make sure that no moisture can enter the fuse box when the cover is open.
When closing the cover, make sure that it is lying correctly on the fuse box. Moisture seeping in or dirt could otherwise impair the operation of the fuses.
- Make sure that the windshield wipers are turned off.
- Open the hood.
- Use a dry cloth to remove any moisture from the fuse box.
- To open: take lines 2 from the guides.
- Open clamps 1.
- Remove the fuse box cover forwards.
- 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 cover and close clamps 1.
- Secure lines 2 in the guides.
- Close the hood.
Luggage Compartment Fuse Box
Make sure that no moisture can enter the fuse box when the cover is open.
When closing the cover, make sure that it is lying correctly on the fuse box. Moisture seeping in or dirt could otherwise impair the operation of the fuses.
- X Open the trunk lid.
- X To open: release cover 1 at the top and open it downwards in the direction of the arrow.
Instrument Panel Fuse Box Fuse Box Diagram
Mercedes-Benz C-Class (2008 – 2014)
| No | 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 Diagram
Mercedes-Benz C-Class (2008 – 2014)
| No | 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)
| No | 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)
| No | 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 Diagram
Mercedes-Benz C-Class (2008 – 2014)
| No | 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
| No | 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 |
