Headlight Module Mercedes W177 W247 LED Ballast Unit Left N/S A2479004104

Headlight Module Mercedes W177 W247 LED Ballast Unit Left N/S is a specialized lighting system component designed to operate the front headlight on the left side of Mercedes vehicles. It is responsible for the precise control of LED diodes, ensuring stable operation, consistent light color, and the proper functioning of headlight features. This is a solution for users who require a technically matched module for modern front lighting.

Specifications and technical data

• SKU: A2479004104
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2479004104
• Substitutable numbers: A2479004104, A 247 900 41 04
• Location on the vehicle: Left
• Category: Headlight Assemblies

Purpose and function of the LED driver

The left LED ballast unit is an integral part of the Front lights system in Mercedes W177 and W247 series models equipped with LED lighting technology. Its task is to manage the operation of the diodes in the driver-side headlight, including the control of intensity, distribution, and stability of the light beam in accordance with signals from the vehicle's electrical system.

The module works with the vehicle's electronics, ensuring proper communication with safety and comfort systems. This allows the headlight to perform its programmed functions and ensures the lighting system remains consistent with the manufacturer's factory settings.

Construction and vehicle fitment

The presented driver is designed as a component dedicated to a specific configuration of the headlight on the left side of the vehicle. The placement on the vehicle is clearly defined, which facilitates the identification of the correct component during diagnostics and replacement. The module's construction is prepared for installation in the factory-designated location, which helps maintain the seal and proper cooling of the entire system.

The original Mercedes origin ensures adherence to appropriate quality standards, electrical compatibility, and compliance with the architecture of the installation in a given model. As a result, the module works with the existing wiring harness and master controllers without the need for any modifications to the installation.

Service application and benefits of replacement

Replacing the left LED ballast unit is recommended in the event of faults such as the headlight failing to illuminate, unstable diode operation, lighting errors stored in the controller memory, or improper functioning of light features. Using the correct module allows for the restoration of full headlight functionality, reducing the risk of further damage to the lighting system.

The main advantages of using this component include:

• maintaining the factory operating parameters of the front headlight on the left side,
• proper cooperation with the vehicle's electronic systems,
• technical fitment to the LED headlight design of the given body generation,
• suitability for use in professional service and post-accident repairs.

Condition characteristics and practical application

The module is offered in used condition, which allows for an economical repair of the lighting system while maintaining the manufacturer's original specifications. Such components are often chosen by professional workshops dealing with automotive electronics and services specializing in the Mercedes brand, where both technical fitment and cost-effectiveness of the repair are important.

Before installation, standard diagnostics of the electrical system and verification of the proper operation of other headlight components are recommended to ensure the stable operation of the entire system after the driver replacement.

Expanding the lighting system in a Mercedes

If you are planning a comprehensive repair or upgrade of the front lighting area in your Mercedes and need other elements from the same group, such as lenses, headlight inserts, or additional control modules, check the available parts in the Mercedes Front lights category.

For drivers interested in a broader look at the impact of chassis components on safety and driving comfort, a guide describing key suspension components may be useful – you can find it in the article Suspension system – a comprehensive guide to shock absorbers, control arms, and stabilizers, which helps to better understand the relationship between the condition of the suspension and the effectiveness of lighting and vehicle handling.