Ballasts/Igniter Modules

OEM Replacement Headlight Ballasts, Igniters & Control Modules

Browse our range of OEM headlight ballasts, igniters, LED modules and AFS control units for factory-fitted xenon (HID) and LED lighting systems.

We supply both genuine and high-quality replacement parts from leading manufacturers including AL (Automotive Lighting), Hella, Valeo, Mitsubishi Electric, Bosch and LEAR, covering a wide range of vehicles.

Fix Common Headlight Faults

These components are commonly required when experiencing headlight issues such as:

• Headlight not turning on
• Light flickering or intermittent operation
• Headlight turns on then switches off
• One headlight dimmer than the other
• Dashboard warning messages

If you are unsure what is causing the fault, you can view our Headlight Faults & Help guide to diagnose the issue before ordering.

What Parts Are Included in This Category?

Xenon Ballasts

Xenon ballasts control the ignition and power supply to D1S, D2S, D3S and D4S HID bulbs. A faulty ballast is one of the most common causes of headlights not working or switching off after ignition.

Igniter Modules

Igniters generate the high voltage required to start the xenon arc inside the bulb. Failure can result in no ignition or intermittent starting.

LED Headlight Modules

LED control modules regulate power and communication within factory LED headlight systems. Faults can cause partial lighting failure or warning messages.

AFS / Adaptive Lighting Modules

AFS modules control adaptive headlight movement and beam adjustment. When faulty, headlights may not level correctly or may display system errors.

Compatible Systems & Fitment

Our range includes parts compatible with vehicles using:

• D1S, D2S, D3S and D4S xenon HID systems
• Factory LED headlight systems
• Adaptive front lighting (AFS) systems

Important: Always match the part number on your existing unit to ensure correct compatibility.

Diagnose Before You Replace

If you are unsure whether the fault is caused by the bulb, ballast or module, a simple swap test can help:

• If the fault moves - the part is faulty
• If the fault stays - wiring or headlight unit issue

For deeper diagnostics, you can also use:

View iCarsoft Diagnostic Tools

Explore OEM Xenon Ballasts

Looking specifically for xenon ballasts and cornering modules? View our specialist category here:

OEM Xenon Ballasts & Cornering Modules

Why Choose HIDS-DIRECT?

• OEM and high-quality replacement parts
• Trusted brands including AL, Hella, Valeo, Mitsubishi Electric, Bosch and LEAR
• UK stock with fast dispatch
• Expert support to help identify the correct part
• 1-year warranty on all products

If you are unsure which part you need, feel free to contact us with your registration, VIN or a photo of your existing unit.

Headlight Ballasts & Modules FAQ

What does a xenon ballast do?

A xenon ballast controls the ignition and power supply to HID bulbs such as D1S, D2S, D3S and D4S. It provides the high voltage needed to start the light and then regulates the power to keep it running.

How do I know if my ballast or igniter is faulty?

Common signs include the headlight not turning on, flickering, or turning on briefly and then switching off. A simple swap test between left and right sides can help confirm if the part is faulty.

What is the difference between a ballast and an igniter?

The ballast controls the power supply to the bulb, while the igniter generates the high voltage needed to start the xenon arc. Some systems combine both functions into a single unit.

Do I need to match the part number exactly?

Yes, it is important to match the part number on your existing unit to ensure compatibility. Even similar-looking modules can have different specifications depending on the vehicle.

Can I replace a xenon ballast myself?

In many cases, xenon ballasts are plug and play and can be replaced without specialist tools. However, access can vary depending on the vehicle and professional installation may be recommended.

Do LED headlight modules require coding?

Most replacement LED headlight modules do not require coding, but some vehicles may need a reset or initialisation. In certain cases, dealer-level diagnostic equipment may be required.