This genuine part (OEM code 2105400472/A2105400472) is a relay assembly that precisely fits the Mercedes-Benz W210 (E-Class), S210 Estate, SLK R170 Coupe. It features an integrated design combining the relay and fuse holder into a single unit. This assembly primarily controls the fuel pump power circuit while also managing the on/off switching of auxiliary electrical systems such as body lights and windows. It serves as a replacement repair part for issues including failure to start the engine, fuel pump stoppage, and intermittent power loss in electrical systems.
The product strictly replicates the original vehicle's pin layout, housing latches, and mounting holes. Each pin specification matches the original vehicle's connector one-to-one, allowing for direct plug-and-play installation in the original location. No cutting of wires or modification of the original wiring is required, eliminating the risk of short circuits or electrical malfunctions caused by misalignment during installation. In older original control boxes, prolonged use leads to oxidized internal contacts and aged, blown fuses. Common issues include: no response when turning the ignition, fuel pump failure, and intermittent operation of vehicle accessories.
The internal components of this product undergo power-on screening and calibration at the factory, ensuring stable contact conductivity. It comes pre-installed with factory-spec fuse blades to stabilize power output to the fuel pump and vehicle electrical systems. The unit features a high-strength, one-piece injection-molded housing with the same type of locking tabs as the original equipment. Once installed, it snaps securely into place and is resistant to loosening, withstanding temperature fluctuations in the vehicle's interior. The independent, compartmentalized fuse design allows for the replacement of individual fuses if damaged, facilitating convenient maintenance.
Every unit undergoes full-function power-on testing and passes quality inspection before leaving the factory. Mechanics can quickly install or replace the unit using basic tools, effectively reducing vehicle downtime and lowering labor costs for repair shops. There is no need to replace the entire fuel pump assembly or the vehicle's wiring harness; a single relay module can resolve circuit faults, significantly reducing repair costs for vehicle owners. Suitable for Mercedes-Benz specialty shops and general automotive repair shops.