Mercedes-Benz A B E M W169 W245 W210 W163 Relay 5-Pin Yellow Hella A0025427419

Mercedes-Benz A B E M W169 W245 W210 W163 Relay 5-Pin Yellow Hella is an original component from the Relays group, designed for use in the electrical systems of Mercedes vehicles. The yellow housing facilitates quick identification in the fuse box, and the 5-pin design ensures stable operation of the vehicle's control systems.

Specifications and technical data

• SKU: A0025427419
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0025427419
• Substitutable numbers: A0025427419, A 002 542 74 19, 4RD007794, 4RD007 794
• Color: Yellow
• Category: Relays

Application and function of the relay

The presented 5-pin relay is responsible for reliable switching of electrical circuits in the vehicle, relieving delicate control elements and ensuring safe operating conditions for them. In typical applications, it can handle circuits with higher current draw, such as selected comfort modules, auxiliary systems, or additional equipment, depending on the configuration of the specific Mercedes model.

The 5-pin contact architecture allows for more complex switching functions than simple two-state relays, which translates into more precise circuit control and stable operation of the onboard electronics.

Construction and functional features

The yellow relay housing makes it easy for technicians and users to quickly locate the component in the relay box, which speeds up diagnostics and potential replacement. The compact form is adapted to factory sockets in Mercedes models, ensuring that installation is orderly and requires no modifications to the wiring.

The relay has been designed to operate in conditions typical for the engine compartment or the vehicle interior, where temperature changes and vibrations occur. The robust housing and properly selected contacts promote long-term, repeatable system operation.

Benefits of using an original relay

Using an original relay in a Mercedes car allows for maintaining consistency of electrical parameters with the manufacturer's factory specifications. As a result, control systems operate within the intended load range, which reduces the risk of unwanted voltage drops, contact overheating, or unstable component performance.

• better fitment to the factory wiring harness and electrical sockets,
• repeatable switching parameters, essential for sensitive control modules,
• simplified diagnostics thanks to the characteristic housing color.

Practical installation tips

Before installation, it is worth verifying the compatibility of the relay with the specific vehicle configuration and the layout of the sockets in the relay box. Replacement usually involves removing the old component and seating the new one in the same socket, maintaining the correct pin orientation. This type of operation is often performed as part of electrical fault diagnostics when unstable circuit operation is suspected.

Due to the nature of the component, it is recommended that installation and functional testing after replacement be carried out in accordance with safety rules for working with vehicle electrical systems.

If you are planning a comprehensive repair or upgrade of the electrical system area in your Mercedes and need other components from the same group, such as control relays, time relays, or auxiliary circuit relays, check the available parts in the Mercedes Relays category.

For drivers interested in a broader context of car maintenance and potential repair costs, a guide regarding problematic engine units may be helpful, available in the article BMW E90 problematic engines – a practical guide to costly failures, which shows how proper part selection and preventive maintenance affect the user's budget.