Mercedes-Benz C-Class W204 Xenon Headlight Ballast Control Module - Genuine OEM A2048700326

Replace a faulty, damaged or non-operational factory xenon ballast with this Genuine OEM Mercedes-Benz Xenon Headlight Control Module, part number A2048700326.

This electronic ballast supplies and regulates the high-voltage electrical power required by a compatible factory xenon headlight and D1S HID bulb.

Product Features

• Genuine OEM Mercedes-Benz lighting component
• Mercedes-Benz part number A2048700326
• Alternative part-number format A 204 870 03 26
• Associated AL reference 130732923900
• Associated AL reference 130732923901
• Replaces selected earlier Mercedes-Benz part number A2308206826
• Xenon HID headlight ballast and control module
• Designed for compatible factory D1S xenon headlights
• Suitable for selected Mercedes-Benz C-Class 204 models
• Original factory connector and mounting configuration

Common Symptoms of a Faulty Ballast

• Xenon headlight does not illuminate
• Headlight switches on and then shuts off
• Light output flickers or operates intermittently
• One headlight appears dimmer than the other
• Left or right dipped-beam warning appears
• Active-light system warning is displayed
• Lighting-related diagnostic fault codes are stored
• Module shows signs of moisture, corrosion or overheating

Vehicle Compatibility

This ballast may be suitable for selected Mercedes-Benz C-Class W204 sedan, S204 wagon and C204 coupe vehicles equipped with a compatible factory xenon headlight system.

Possible applications include selected C180, C200, C220, C250, C280, C300, C320, C350 and C63 AMG variants. Compatibility varies according to the production date, body style, headlight assembly, xenon bulb type and adaptive-lighting equipment.

Mercedes-Benz catalogues part number A2048700326 as a right-side xenon-light control unit. Some replacement references describe compatible ballast versions as suitable for either the left or right headlight. The original module number and headlight specification must therefore be checked before purchase.

Please compare part number A2048700326, the AL reference, hardware and software markings, connectors and mounting points with the original ballast. Similar-looking xenon modules may not be interchangeable.

Coding and Programming Requirements

Coding, programming and component-protection removal are not normally required when installing this ballast as an exact like-for-like replacement in a compatible factory xenon headlight.

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, suspension level sensors or other headlight-range components are replaced or retrofitted.

This module should not be considered a complete plug-and-play conversion for a vehicle originally fitted with halogen headlights.

Installation Information

Professional installation by a qualified Mercedes-Benz technician or automotive lighting specialist is recommended.

Xenon lighting systems generate dangerously high voltage. The battery and lighting system must be isolated using the correct workshop procedure before the headlight or ballast is disconnected.

The headlight housing, wiring, connector, bulb, mounting surface and seals should be checked for water entry, corrosion, heat damage or loose terminals before fitting the replacement module.

After installation, the xenon light, dipped beam, headlight levelling and adaptive-lighting functions should be tested where equipped. The headlight aim should also be checked and adjusted when required.