Mercedes-Benz C-Class (2008-2014) Fuses and Fuse box diagram and Location

Mercedes-Benz C-Class (2008-2014) Fuses and Fuse box diagram and Location

Different Fuse boxes location

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

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

Assignment of the fuses in the instrument panel

Assignment of the fuses and relay in the engine compartment

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 engines 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 autopilot 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 engines 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| Relay Type
---|---
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 engines 156, 272, 276: Secondary air injection relay
Q| Backup relay
R| Chassis circuit 87 relay

Front Pre-fuse Box (up to 2010)

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| –

Fuses Introduction

The electrical fuses in your vehicle serve to switch off malfunctioning power circuits. If a fuse is blown, the components and systems secured by that fuse will stop operating.

Warning!
Only use fuses approved by Mercedes-Benz with the specified amperage for the system in question and do not attempt to repair or bridge a blown fuse. Using other than approved fuses or using repaired or bridged fuses may cause an overload leading to a fire, and/or cause damage to electrical components and/or systems. Have the cause determined and remedied by an authorized Mercedes-Benz Center.

A blown fuse must be replaced by an appropriate spare fuse (recognizable by its color or the fuse rating given on the fuse) of the amperage recommended in the fuse chart. Any Mercedes-Benz Center will be glad to advise you on this subject. In case of a blown fuse contact Roadside Assistance or an authorized Mercedes- Benz Center. If a newly inserted fuse blows again, have the cause determined and rectified by an authorized Mercedes-Benz Center. A fuse chart is located in the fuse box in the passenger compartment. The fuse chart explains the fuse allocation and fuse amperages.

Before replacing fuses

• Engage the parking brake.
• Make sure the automatic transmission is in park position P.
• Switch off all electrical consumers.
• Turn off the engine.
• Remove the SmartKey from the starter switch.

Fuse boxes in the passenger compartment

The fuse box cover must be properly positioned as described. Otherwise, moisture or dirt could enter the fuse box and possibly impair fuse operation.

Fuse box in dashbord

• Open the driver’s door.
• Opening: Remove cover 1 in the direction of the arrows.

Fuse box in the front passenger footwell

• Open the front passenger door.
• Opening: Unscrew mounting screws 1
• Remove cover 2 in the direction of the arrow.
• Unscrew mounting screws 3
• Remove cover 4 in the direction of the arrows
• To make changing the fuses easier, fuse box 5 can be folded down slightly.
• Unscrew mounting screws 6
• Fold fuse box 5 downward in the direction of the arrow.

Fuse box in the middle tunnel
Removing front-end stops

Warning!
Do not drive the vehicle when the front-end stops are not correctly installed. Failure to reinstall stops as indicated may result in serious injury in certain frontal crashes. Adjust the front passenger seat as far aspossible rearward from the dashboard when the seat is occupied. Comply with the information on the occupant safety section.

Front end stop on the right seat rail left seat rail laterally reversed

1. Front end stop
2. Spacing
   • Open the front passenger door.
   • Remove both front-end stops and 1 of the front passenger seat tracks using a screwdriver.
   • Move the front passenger seat fully forward.
   • When reinstalling the front passenger seat track stops, place the end stops in the correct position. For your safety, maintain proper spacing.

Opening fuse box

• Unscrew mounting screws 1
• Remove cover 2 in the direction of the arrow.

Fuse box in battery box

• The battery box is located under a cover in the rear footwell.
• Replacement of fuses can only be performed at a Mercedes-Benz Center.

FAQs

What is the purpose of fuses in my Mercedes-Benz C-Class?

Fuses are protective devices designed to interrupt the circuit if the circuit current reaches a predetermined force limit. This is necessary to protect the parts and wires of the vehicle from burning out or getting damaged due to excessive current.

How many fuse boxes does a Mercedes-Benz C-Class (2008-2014) have?

The Mercedes-Benz C-Class from this period generally comes with multiple fuse boxes - typically one located in the engine compartment and another inside the cabin, often on the driver's side.

Where is the main fuse box located in the engine compartment?

The main fuse box in the engine compartment is typically located near the battery, often within a protective cover or housing.

How can I access the interior fuse box?

The interior fuse box is usually located on the driver's side, either under the dashboard or on the side of the dashboard where the door meets. You might need to open the driver's door to access it.

Is there a fuse diagram available inside the car?

Yes, usually there's a fuse diagram on the inside of the fuse box cover. It gives information about fuse capacities and their specific functions within the car.

My radio stopped working, which fuse should I check?

If your radio stops working, you should refer to the fuse box diagram to locate the fuse associated with the radio/audio system. It will be labeled appropriately.

How often should I inspect the fuses in my Mercedes-Benz C-Class?

While fuses don't have a specific lifespan, it's a good practice to check them once a year or if you start noticing electrical components of your vehicle not working as they should.

Are all the fuses in the Mercedes-Benz C-Class of the same type?

No, there are different types and ratings of fuses. It's essential to replace a blown fuse with one of the same rating to ensure proper protection of the circuit.

How can I tell if a fuse is blown?

A blown fuse will typically show a broken or melted wire or filament inside its transparent casing. Sometimes, there might be discoloration or scorch marks.

What should I do if I replace a fuse and it blows again shortly after?

If a fuse blows again shortly after replacement, there might be an underlying issue, such as a short circuit. In such cases, consult a professional mechanic or technician to diagnose the problem.

Can I replace the fuses myself?

Yes, replacing fuses is typically a straightforward task. However, always ensure the vehicle is off, the key is removed, and you are using the correct fuse type and rating.

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