2025 Mercedes S-Class Fuses and Fuse Box User Guide
The 2025 Mercedes S-Class fuses and fuse box keep your vehicle’s electrical components safe by preventing overloads and short circuits. Knowing their locations and functions promotes smooth functioning and simplifies troubleshooting for lights, infotainment, and other critical systems.
Mercedes Electrical fuses Guide
Notes on electrical fuses
WARNING
Risk of accident and injury due to overloaded lines If you manipulate or bridge a faulty fuse or if you replace it with a fuse with a higher amperage, the electric line could be overloaded. This could result in a fire.
- Always replace faulty fuses with specified new fuses containing
the correct amperage.
NOTE
Damage due to incorrect fuses Using incorrect fuses can result in damage to electrical components or systems or their functions being considerably restricted.
- Use only fuses approved for Mercedes-Benz with the respective
specified fuse rating.
Replace blown fuses with equivalent fuses, identifiable by their color and label. The fuse ratings and further information to be observed can be found in the fuse assignment diagram.
Fuse assignment diagram: on the fuse box in the rear
NOTE
Damage or malfunctions caused by moisture
Moisture may cause damage to the electrical system or cause it to
malfunction.
- When the fuse box is open, make sure that no moisture can
enter the fuse box. - When closing the fuse box, make sure that the seal of the lid is
positioned correctly on the fuse box.
If the newly inserted fuse also blows, have the cause determined and rectified at a qualified specialist workshop.
ENSURE THE FOLLOWING BEFORE REPLACING A FUSE:
- The vehicle is secured against rolling away.
- All electrical consumers are switched off.
- The vehicle is switched off.
THE ELECTRICAL FUSES ARE LOCATED IN THE FOLLOWING FUSE BOXES:
- Fuse box in the engine compartment on the driver’s side
- Fuse box on the driver’s side of the cockpit
- Fuse box in the front passenger footwell
- Fuse box in the trunk on the right-hand side of the vehicle, when viewed in the direction of travel
Electrical fuses
WARNING
Risk of accident and injury due to overloaded lines If you manipulate or bridge a faulty fuse or if you replace it with a fuse with a higher amperage, the electric line could be overloaded. This could result in a fire.
- Always replace faulty fuses with specified new fuses containing
the correct amperage.
NOTE
Damage due to incorrect fuses
Using incorrect fuses can result in damage to electrical components or
systems or their functions being considerably restricted.
- Use only fuses approved for Mercedes-Benz with the respective
specified fuse rating.
Replace blown fuses with equivalent fuses, identifiable by their color and the fuse rating. The fuse ratings and further information to be observed can be found in the fuse assignment diagram.
Fuse assignment diagram: in the vehicle document wallet.
NOTE
Damage or malfunctions caused by moisture
Moisture may cause damage to the electrical system or cause it to
malfunction.
- When the fuse box is open, make sure that no moisture can
enter the fuse box. - When closing the fuse box, make sure that the seal of the lid is
positioned correctly on the fuse box.
If the newly inserted fuse also blows, have the cause traced and rectified at a qualified specialist workshop
ENSURE THE FOLLOWING BEFORE REPLACING A FUSE:
- The vehicle is secured against rolling away.
- All electrical consumers are switched off.
- The vehicle is switched off.
THE ELECTRICAL FUSES ARE LOCATED IN THE FOLLOWING FUSE BOXES:
- Fuse box in the engine compartment on the driver’s side
- Fuse box on the driver’s side of the cockpit
- Fuse box in the front passenger footwell
- Fuse box in the trunk on the right-hand side of the vehicle, when viewed in the direction of travel
Opening and closing the fuse box in the engine compartment
Requirements:
- Observe the notes on electrical fuses
- Have the following tools readily available:
- a dry cloth
- a screwdriver with an appropriate head
OPENING
Depending on the vehicle equipment, access to the fuse box may
be limited. Mercedes-Benz recommends consulting a qualified
specialist workshop, e.g. an authorized Mercedes-Benz Center.
WARNING
Risk of injury from using the windshield wipers when the hood is
open If the windshield wipers start moving when the hood is open, you could be trapped by the wiper linkage.
- Always switch off the windshield wipers and vehicle before
opening the hood.
- Release the rotary catches on cover 1 and pull the cover up and out.
- Remove any existing moisture from the fuse box using a dry cloth.
- Depending on the vehicle equipment, there may be an electrical component 2 on the fuse box lid. If present, unscrew screw 3 and put the component to the side without disconnecting the electrical connection.
- If present, release hoses 4 from the retaining clips on the fuse box and vehicle body.
- If present, release hoses 5 from the retaining clips in the engine compartment and vehicle body.
- Unscrew screws 6 and fold out bar 7.
- Unscrew screws 8 and remove fuse box lid 9 to the side.
CLOSING
- Check whether the seal is positioned correctly in lid 9.
- Place lid 9 on the fuse box and tighten screws 8
- Fold back bar 7 and tighten screws 6.
- If present, engage hoses 5 in the retaining clips in the engine compartment and vehicle body.
- If present, engage hoses 4 in the retaining clips on the fuse box and
vehicle body.
- If present, insert electrical component 2 into the holder on the fuse box lid and tighten screws 3.
- Insert cover 1 and engage the rotary catches.
Opening and closing the fuse housing in the cockpit
Requirements:
- Observe the notes on electrical fuses
The fuse housing is on the driver’s side on the side of the cockpit under a cover.
- To open: open cover 1 in the direction of the arrow and remove it.
- To close: reinsert cover
Mercedes-Benz recommends you have the fuse housing opened at an authorized Mercedes-Benz Center.
Opening and closing the fuse box in the front passenger footwell
Requirements
- Observe the notes on electrical fuses
- To open: open cover 1 in the direction of the arrow and remove it.
- To close: reinsert cover
Opening and closing the fuse box in the boot
Requirements
- Observe the notes on electrical fuses
- Open: Fold cover 1 down in the direction of the arrow and remove.
- To close: reinsert cover
How to replace the Fuse of the 2025 Mercedes S-Class
Replacing a fuse in a 2025 Mercedes S-Class is a relatively straightforward process. Here’s a general guide:
Materials:
- The new fuse of the correct amperage.
- Fuse puller or needle-nose pliers.
-
Locate the correct fuse box for the malfunctioning system (refer to your fuse diagram label inside the cover).
-
Open the fuse box cover.
-
Identify the faulty fuse:
-
Use the diagram to find the fuse for the system you’re troubleshooting (e.g., headlights, infotainment, seat controls).
-
A blown fuse will have a melted or broken metal strip inside.
-
-
Use the fuse puller to remove the bad fuse.
-
Insert a new fuse of the same amperage rating (marked on the fuse and diagram).
-
Replace the fuse box cover securely.
- Tips:
- Always use a fuse with the correct amperage rating to prevent electrical issues or damage to the vehicle.
- If a fuse blows repeatedly, it may indicate an underlying electrical problem and professional assistance may be needed.
Useful Links:
2023 Mercedes-Benz S-Class Review, Specs, Price and Mileage (Brochure)
2025 Mercedes S-Class Warning Lights and Indicators User Guide