Mercedes-Benz S-Class Fuse Box Replacement Parts

The S-Class has run across several distinct generations — the W220 (1998–2005), W221 (2005–2013), W222 (2014–2020), and W223 (2020–present) — and the fuse box architecture changed significantly between each of them, so a W220 unit will not drop into a W221 without serious compatibility issues. Each generation has its own wiring layout, connector types, and control module integration, meaning you must match the generation to your car. Always confirm the exact part against your registration with the breaker before buying.

This question spans a generation boundary: the W221 ran until 2013 and the W222 launched in 2014, so a 2012 car is a W221 and a 2014 car is a W222 — these are entirely different generations with different electrical architectures. The fuse boxes are not interchangeable across this boundary, and you should ensure you source a unit from the correct generation for your car. Confirm the exact part number against your registration with the breaker to be certain.

Trim level can influence fuse box specification on the S-Class because higher trims and AMG variants often have additional features — such as different air suspension systems, night vision, or performance engine management — that may require a fuse box configured for those circuits. Unlike alloys or some mechanical parts, the fuse box is closely tied to the options and equipment fitted to the specific car rather than trim name alone. Because of this, it is genuinely important to confirm the donor car's specification against your own registration with the breaker, rather than relying on trim name as a safe guide.

Unlike some parts where engine type makes little difference, the fuse box on the S-Class can vary depending on whether the car has a petrol, diesel, or hybrid drivetrain, as each variant may have different fused circuits for engine management, emissions equipment, or hybrid battery systems. Within the same generation, a straight-six diesel S-Class and a V12 petrol S-Class are unlikely to share an identical fuse box configuration. Always quote your exact engine code and registration to the breaker so they can match the correct unit from a comparable donor car.

Yes — the S-Class typically has more than one fuse and relay box, commonly including one in the engine bay and one or more interior units, and on newer generations there are additional Sam (Signal Acquisition Module) units that act as combined fuse and control modules. If you know which fuse box has failed — for example the engine bay unit or the interior passenger-compartment unit — tell the breaker specifically, as they are separate parts and priced accordingly. Confirm the location and part number against your registration with the breaker to make sure you get the right one.

The W222 S-Class received a facelift in 2017, and while both sit within the same generation, the facelift introduced updated LED lighting systems, revised driver assistance tech, and other electrical changes that may have altered fuse box specification or SAM module configuration. Whether a post-2017 unit fits a pre-2017 W222 is not something that can be guaranteed without checking part numbers carefully, as even within a generation a mid-life update can create differences. Confirm the donor car's model year and spec against your own registration with the breaker before purchasing.