2021 Mercedes-Benz Metris Fuse Box Diagram & Amperage

Quick answer

The 2021 Mercedes-Benz Metris has three main fuse box locations: under the hood, behind the driver's side dashboard kick panel, and in the cargo area on the left side.

Under-hood Fuse Box

The under-hood fuse box on your 2021 Mercedes-Benz Metris is located on the driver's side, near the battery. This box primarily houses fuses and relays for critical engine functions, ABS, and high-current accessories.

Relay Locations (Under-hood):

• K1: Starter Relay
• K2: Fuel Pump Relay
• K3: Horn Relay
• K4: A/C Clutch Relay
• K5: Radiator Fan Relay

Interior Fuse Box (Driver's Side Dash Kick Panel)

The interior fuse box is situated behind the kick panel on the driver's side, easily accessible by removing the panel below the steering column. This box typically covers interior electrical components, infotainment, and various accessories.

Cargo Area Fuse Box (Left Side)

For the 2021 Mercedes-Benz Metris, an additional fuse box is located in the cargo area, usually behind a removable panel on the left-hand side. This fuse box commonly handles power for rear accessories, trailer connections, and other cargo-specific electrical systems.

How to test a fuse

Testing a fuse is a straightforward process. You'll need a fuse puller (often found in the fuse box lid or with your vehicle's tools) and a multimeter or a dedicated fuse tester.

1. Locate the suspected fuse: Refer to the appropriate fuse box diagram above or the legend on your fuse box lid to identify the fuse for the circuit that is not working.
2. Turn off the ignition: Always ensure the vehicle's ignition is off before removing or inserting fuses to prevent electrical damage.
3. Carefully remove the fuse: Use the fuse puller to gently extract the fuse from its slot. If you don't have a puller, small needle-nose pliers can work, but be cautious not to damage the fuse or its contacts.
4. Visually inspect the fuse: Most automotive fuses are designed with a visible wire connecting the two prongs. If this wire is broken or melted, the fuse is blown and needs to be replaced.
5. Test with a multimeter (optional but recommended):
   • Set your multimeter to the continuity setting (usually indicated by a symbol resembling a sound wave or diode).
   • Touch one probe of the multimeter to each metal blade of the fuse.
   • If the fuse is good, the multimeter will beep or show a reading close to zero ohms, indicating continuity. If it's blown, you'll get no reading (open circuit).
6. Replace with a new fuse: If the fuse is blown, replace it with a new fuse of the exact same amperage rating and type. Using a fuse with a higher amperage can lead to serious electrical damage or fire.

Common blown fuses on this vehicle

While any fuse can blow, certain circuits are more prone to issues due to their constant use or the components they protect. For the 2021 Mercedes-Benz Metris, some commonly blown fuses include:

• Cigar Lighter/12V Outlets (Interior Fuse Box F2): These fuses are frequently overloaded by high-power accessories like phone chargers, portable air compressors, or even faulty devices. If your 12V outlets aren't working, check this fuse first, and ensure any devices you plug in are within the circuit's amperage limits.
• Blower Motor (Under-hood F10 or Interior F8): The blower motor works hard, especially in extreme temperatures, and can be a common point of failure. If your HVAC fan isn't working at any speed, check both the under-hood fuse for the main motor circuit and the interior fuse for the control circuit. A failing blower motor itself can also cause the fuse to blow.
• Trailer Brake Controller (Cargo Area F1): If you frequently tow or use a trailer brake controller, this fuse can blow due to shorts in the trailer wiring or an overloaded system. Always inspect your trailer's wiring for any frayed or exposed sections if this fuse keeps blowing.
• Headlights (Under-hood F5, F6, F7): While less common with modern LED systems, a sudden surge or a faulty bulb (in halogen systems) can cause headlight fuses to blow. If one or both headlights are out, check these fuses.

Always check the easiest things first: If a component isn't working, first ensure it's properly connected and that the vehicle's battery has sufficient charge. Then, consult the fuse box diagram to locate the relevant fuse and visually inspect it before proceeding with more in-depth diagnostics.

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