Mercedes-Benz C-Class (2000-2007) Fuses and Fuse box diagram and Location

Mercedes-Benz C-Class (2000-2007) Fuses and Fuse box diagram and Location

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 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. If a newly inserted fuse blows again, the cause is determined and rectified by an authorized Mercedes-Benz Center. The following aids are available to help you replace fuses.

Fuse Box

Fuse chart

The fuse chart is located in the main fuse box in the passenger compartment (page 392). The fuse chart explains the fuse allocation and fuse amperages.

Spare fuses
Spare fuses are located in the vehicle tool kit in the spare wheel well page 356).

Fuse extractor

The fuse extractor is located in the cover of the auxiliary fuse box in the trunk (page 394).
The electrical fuses are located in different fuse boxes:

• in the passenger compartment on the driver’s side (page 392)
• on the driver’s side of the engine compartment ( page 392)
• in the trunk (page 394)

Before replacing fuses

• Apply the parking brake (page 54).
• Make sure the gear selector lever is set to position P (page 153) (manual transmission: to Neutral (page 149).
• Turn off all electrical consumers.
• Turn off the engine ( page 55).
• Remove the SmartKey from the starter switch.

The main fuse box in the passenger compartment
The main fuse box is located in the passenger compartment on the driver’s side of the cockpit.

The main fuse box cover

Opening fuse box
Open the driver’s door. Pull fuse box cover 1 open with a screwdriver or similar tool (see arrow). Remove fuse box cover 1 rearward.

Closing fuse box
Attach fuse box cover 1 in the front. Fold the fuse box cover 1 in until it engages.

Fuse box in the engine compartment

The fuse box is located in the engine compartment on the driver’s side.

1. Cover
2. Screws
3. Retainer

Removing cover

• Twist screws 2 90° counterclockwise.
• Lift the rear of cover 1.
• Slide out retainer 3 and remove cover 1 by pulling towards the front.
• Fuse box cover
• Clamps
• With a dry cloth, remove any moisture from the fuse box.
• Release clamps 5.
• Remove the fuse box cover 4.

Opening fuse box

Closing fuse box

• Make sure that the sealing rubber is properly positioned.
• Press fuse box cover 4 down and secure with clamps 5.

The fuse box cover 4 must be properly positioned as described to prevent moisture or dirt from entering the fuse box and possibly impairing fuse operation.

Installing cover

• Insert cover 1 sideways into retainer 3.
• Twist screws 2 90° clockwise.

Fuse box in the trunk

The fuse box is located in the trunk behind the left-hand trim panel.

1. Trim panel
2. Fuse extractor
3. Fuse box cover

Opening fuse box
Pull away trim panel 1.

• Remove the fuse box cover 3.

Closing fuse box

• Insert fuse box cover 3.
• Insert trim panel 1.

Troubleshooting

• The Check Engine Light (also known as CEL):
  • If the Check Engine Light is illuminated, an OBD-II scanner can be used to extract the error codes stored in the vehicle. These codes can provide valuable information about the problem.
  • The check engine light (CEL) can be triggered by a variety of faults, the most common of which are defective oxygen sensors, a loose gas cap or issues with the mass airflow sensor.
  • If the car doesn’t start, check the battery’s condition and connections. In many cases, the problem is caused by a dead or failing battery.
  • Check to see if there are any problems with the starter motor and the ignition switch. It’s possible that a worn-out starter has to be replaced.
• Problems with Transmission:
  • If you are experiencing issues with the gearbox, such as the gears slipping or shifting too harshly, you should have the level of gearbox fluid as well as its condition evaluated.
  • Transmission problems might arise if the fluid level is too low or it is polluted.
• Problems with Electricity:
  • Electrical faults can present themselves in a variety of ways, including malfunctioning power windows and door locks, as well as lights that don’t work properly.
  • Check the wiring, as well as the fuses and relays, for any faults. If necessary, get in touch with an experienced car electrician.
• Problems with the Cooling System:
  • An issue with the radiator, the thermostat, or the fan that controls the cooling might lead to overheating. Conduct a leak test on the cooling system and check to see that it has the required amount of coolant.
  • Both the Steering and the Suspension
  • If you experience vibrations, steering wheel wobble, or unusual noises while driving, it may be related to suspension or steering components.
  • Check the wheel bearings, ball joints, and bushings to see whether they have become worn.
• Issues with the Breaks:
  • Squeaking or grinding noises when braking can indicate worn brake pads or rotors. Inspect the brake system and replace any worn components promptly for safety.
• Climate control with heating and cooling:
  • If the heating, ventilation, and air conditioning system is not operating as it should, there may be a leak in the refrigerant line, a problem with the blower motor or an issue with the temperature control unit.
• Problems with the Exhaust System:
  • Excessive noise as well as a decrease in performance might result from exhaust system flaws such as leaks or holes. Conduct a thorough inspection of the exhaust system for any signs of damage or corrosion.
• Idling Roughly or Having Poor Performance:
  • It is possible that problems with the fuel system are the cause of your Mercedes-Benz C-Class’s harsh idle performance or its lack of power when accelerating.
  • These problems could be caused by a clogged fuel filter or a fuel injector that is not functioning properly.
• Spills of Oil:
  • Make sure there are no oil leaks, paying close attention to the areas around the engine and gearbox. Taking timely action to fix oil leaks can prevent more serious problems from occurring.
• In terms of both Suspension and Alignment:
  • Tires that have worn unevenly or a car that leans to one side are both signs that there may be an issue with the suspension or wheel alignment. If necessary, have a professional check your vehicle’s alignment and suspension.
• Problems with Noise:
  • Strange sounds, such as clunks, rattles, or squeaks, could originate from a number of different components of the vehicle. Carefully listen and locate the source of the noise before attempting repairs.

Maintenance

It is important to maintain your vehicle by changing the oil and oil filter at regular intervals, which is normally every 7,500 to 10,000 miles or as directed in the owner’s handbook.

• Check the Levels of the Fluids:
  Coolant, gearbox fluid, brake fluid, power steering fluid, and windscreen washer fluid are some of the vital fluids that need to be checked and topped off on a regular basis.

• Upkeep That Has Been Planned:
  Follow the manufacturer’s recommended maintenance schedule outlined in your owner’s manual. This includes services such as the replacement of spark plugs, air filters, and a variety of other components.

• Taking Care of Your Tyres:
  Always remember to rotate your tires on a regular basis to guarantee uniform wear. Check the tire pressure once a month and keep it at the level it should be at all times.
  Check the tires to see if there are any signs of damage or excessive wear, and then replace the tires if necessary.

• Brake System Maintenance:
  Keep an eye on the wear on the rotors and the brake pads. When the brake pads become too worn, change them, and either resurface the rotors or replace them if necessary.
  Make sure there are no leaks in the brake fluid, and keep the levels of the brake fluid at the required levels.

• Filter for the Air:
  Replace the engine air filter as recommended in your owner’s manual to maintain proper air intake and engine performance.

• Cooling System:
  Conduct a leak test on the cooling system and check that it has the appropriate amount of coolant. Mercedes-Benz suggests that you change the coolant according to their guidelines.

• Maintenance of the Gearbox:
  Perform maintenance on the gearbox in accordance with the instructions given in the owner’s handbook. This may involve fluid replacement or flushing the system.

• Battery Maintenance :
  Keep the battery terminals clean and secure. Maintain a regular check on the health of the battery, and replace it if it reveals any signs of deterioration.

• Electrical System:
  Check for wear and damage to any electrical components, such as fuses, relays, or bulbs, and replace them as necessary.
  Perform routine checks on the exhaust system to look for any signs of leaks, corrosion, or component damage.

• Both the Steering and the Suspension
  Conduct routine inspections to look for signs of wear and tear on the components of the steering and suspension systems. When necessary, you should replace the bushings, ball joints, or tie rods.

• Maintenance of the Fuel System:
  Utilise gasoline of a high quality, and take into consideration the use of fuel system cleaners on a recurrent basis, in order to maintain a clean fuel system.

• Cleaning and Polishing:
  It is important to frequently wash and wax your Mercedes-Benz in order to preserve the paint and finish. It is important to pay attention to the undercarriage in order to avoid rust.

• Upkeep of the Interior:
  Maintain a sanitary and well-maintained condition within. Make sure to preserve the dashboard and the seats from ultraviolet damage by using the appropriate cleaning chemicals for each surface.

• Maintain a Steady Speed:
  Avoid harsh driving habits such as rapid acceleration and heavy braking, as they can wear out components faster.

• Maintain a Good Storage:
  If you plan to store the vehicle for an extended period, follow proper storage procedures, such as disconnecting the battery, using a car cover, and maintaining tire pressure.

FAQs

What are the different models and body styles available in the Mercedes-Benz C-Class (2000-2007)?

The 2000-2007 Mercedes-Benz C-Class was available in various body styles, including sedan (W203), coupe (C203), and wagon (S203). It also came in different trims and engine options.

What are the common engine options for this generation of the C-Class?

The C-Class (2000-2007) offered a range of engines, including inline-four and V6 options. Engine options varied depending on the specific model and trim level, with both gasoline and diesel variants available.

Is the Mercedes-Benz C-Class from this era known for any common issues or problems?

While the C-Class is generally known for its reliability, some common issues in this generation may include electrical problems, such as faulty window regulators or sensor failures. Additionally, transmission issues and suspension components wearing out can occur over time.

What is the recommended maintenance schedule for the Mercedes-Benz C-Class (2000-2007)?

The recommended maintenance schedule can vary depending on the specific model and engine option. It's best to refer to your owner's manual for the manufacturer's guidelines on maintenance intervals and tasks.

How often should I change the oil in my C-Class from this era?

The oil change interval typically ranges from every 7,500 to 10,000 miles, but it's essential to follow the specific recommendations in your owner's manual.

What should I do if my Mercedes-Benz C-Class's Check Engine Light comes on?

If the Check Engine Light (CEL) comes on, it's essential to have the vehicle scanned for diagnostic trouble codes (DTCs) using an OBD-II scanner. The codes will help identify the specific issue, and you can then take appropriate action based on the codes

What are some common signs that my C-Class may need new brakes?

Common signs of brake wear include squeaking or grinding noises, reduced braking performance, a soft or spongy brake pedal, or pulsation when applying the brakes. If you notice any of these signs, have your brakes inspected and serviced.

How can I maintain the leather interior in my C-Class?

To maintain the leather interior, clean it regularly using a leather cleaner and conditioner. Avoid leaving the car in direct sunlight for extended periods to prevent leather from drying out and cracking.

Is it necessary to use premium fuel in my Mercedes-Benz C-Class (2000-2007)?

Many Mercedes-Benz vehicles, including the C-Class, recommend using premium (91+ octane) fuel for optimal performance and fuel efficiency. Check your owner's manual for the specific fuel requirements of your model.

What should I do if my Mercedes-Benz C-Class experiences electrical issues, such as malfunctioning windows or lights?

For electrical issues, it's advisable to have a professional diagnose and repair the problem, as electrical systems can be complex. Check fuses and relays first to rule out simple issues.

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