Mercedes-Benz GLA W156 LED Headlight Control Module Ballast - Genuine OEM A2189009303

Replace a faulty or damaged factory headlight lighting module with this Genuine OEM Mercedes-Benz LED Control Module, part number A2189009303.

This electronic module operates as an LED voltage converter within a compatible factory headlight assembly, helping provide the regulated electrical output required by the vehicle's lighting system.

Product Features

• Genuine OEM Mercedes-Benz lighting component
• Mercedes-Benz part number A2189009303
• Alternative part number format A 218 900 93 03
• May interchange with selected A1668203589 applications
• Superseded by selected remanufactured number A218900930364
• LED headlight control module and voltage converter
• Also referred to as a headlight ballast or LAM-S3 module
• Suitable for selected Mercedes-Benz GLA W156 models
• Original factory-style connector and mounting design

Common Symptoms of a Faulty Module

• Headlight or daytime running light does not illuminate
• Lighting operates intermittently or flickers
• One side appears dimmer than the other
• Headlight warning appears on the instrument display
• Lighting-related diagnostic fault codes are stored
• Module shows signs of moisture, corrosion or overheating

Vehicle Compatibility

This module may be suitable for selected Mercedes-Benz GLA W156 vehicles equipped with a compatible factory headlight system.

Compatibility can vary according to the vehicle model, production year, headlight specification, installation position, connector and other lighting equipment.

Please compare part number A2189009303, the connector, mounting points and all additional identification numbers with the original module before purchasing. Similar-looking lighting modules may not be interchangeable.

Coding and Programming Requirements

Coding is not normally required when installing this module as an exact like-for-like replacement in a compatible headlight assembly.

A diagnostic scan and stored fault-code clearing may still be required after installation. Coding, adaptation or calibration may be necessary if the complete headlight assembly, adaptive-lighting controller, headlight-range system or other lighting components are also replaced.

Installation Information

Professional installation is recommended. The headlight assembly, wiring, connector and sealing points should be inspected for corrosion, water entry, heat damage or loose terminals before fitting the replacement module.

The complete lighting system should be tested after installation to confirm correct headlight and daytime running light operation and ensure that no related warning messages remain active.