Mercedes W204 Genuine Universal In Car Black Relay 4-Pin Tyco A0025421319

Mercedes W204 Genuine Universal In Car Black Relay 4-Pin Tyco is a component from the Electronic control modules and controllers category, designed for use in the electrical systems of Mercedes vehicles. It enables stable switching of high-load circuits using a low-current control signal, which supports the safe and predictable operation of electrical systems.

Specifications and technical data

• SKU: A0025421319
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0025421319
• Substitutable numbers: A0025421319, A 0025421319, A 002 542 13 19, ASZ
• Color: Black
• Category: ECUs & Computer Modules

Technical characteristics and application

The TYCO relay with a four-pin contact configuration is a classic solution used in many control circuits in Mercedes cars. The four pins allow for the implementation of basic switching functions typical for power supply circuits for consumers, such as control modules, actuators, or selected comfort components.

The design, based on electromagnetic relay technology, ensures clear separation between the control circuit and the power circuit, which limits the risk of overloading delicate controller outputs. As a result, the relay can function as a reliable intermediate component between control electronics and consumers requiring higher current.

Construction, color, and installation integration

The Black housing makes it easy to visually match the relay to factory wiring harnesses and fuse boxes in Mercedes vehicles, where dark electrical components predominate. This color scheme helps maintain a consistent appearance in the engine bay or under the dashboard, which is important for maintenance performed according to factory standards.

The relay format is adapted to typical sockets used in Mercedes installations, which facilitates plug-and-play installation – once matched to the specific application and the vehicle's electrical diagram. This allows the component to be integrated into the existing system without the need for harness modifications, provided the pin configuration matches the factory solution.

Benefits of use and operational aspects

As a component from the Electronic control modules and controllers category, the TYCO relay supports the stability of electrical systems by reducing the load on delicate controller outputs and switches. A properly selected relay helps reduce voltage drops and arcing on control contacts, which translates into a longer service life for the entire circuit.

The used nature of the product allows for the cost-effective restoration of electrical system efficiency while maintaining compatibility with solutions used in Mercedes vehicles. In practice, this means the ability to service control systems without the need to resort to replacements with uncertain parameters, provided that proper diagnostics and application verification in the specific model are performed.

Selection, compatibility, and technical support

When selecting a relay for a specific car, it is worth paying attention to compatibility with the factory electrical diagram, load type, and contact configuration. This relay model can work with various control modules in Mercedes vehicles, so it is crucial to refer to service documentation or markings on the existing component in the car.

If you are planning a comprehensive repair or upgrade of the electrical installation area in your Mercedes and need other components from the same group, such as additional relays, control modules, or auxiliary controllers, check the available parts in the Mercedes electronic control modules and controllers category.

More about the role of original modules and relays

The importance of properly selected control elements in modern cars is well illustrated by solutions used in other premium brands. In the context of maintaining the character of the vehicle and its electronic systems, it is worth reading the material describing how original modules and controllers influence the car's performance – this is discussed in detail in the article Audi and pure emotion. How do used parts help maintain the brand's DNA?. Although it concerns Audi, the issues of precision in part selection and electronics quality discussed there are analogous to the standards applied in Mercedes.