HID Ballast with Ignitor - Headlight Control Unit Module - Replaces 85967-50020. The HID or Xenon Ballast in your Lexus, Toyota, Mazda, Lincoln, Porsche or Land Rover vehicle is responsible for supplying power to your headlight?s bulb. Overtime your HID Ballast can fail resulting in a headlight that flickers or does not turn on at all. This AA Ignition HID Xenon Ballast includes the HID Ignitor and is a direct replacement for the ballast on your Lexus, Toyota, Mazda, Lincoln, Porsche or Land Rover vehicle. Every ballast is designed to connect directly to your vehicle and requires NO programming or coding. Each of your vehicle?s headlights has its own ballast. These ballasts are commonly mounted either on the back or on the bottom of the headlight. While the HID Xenon Ballasts do commonly fail so can your factory headlight bulb. Please see our procedure below to determine if your factory HID Xenon Ballast has failed or if you simply need to replace your headlight bulb. This HID Ballast Fits the Following Vehicles: 2000-2003 Lexus ES300 2004-2006 Lexus ES330 2001-2005 Lexus IS300 2001-2006 Lexus LS430 2001-2003 Lexus RX300 2004-2006 Lexus RX330 2007-2009 Lexus RX350 2006-2008 Lexus RX400H 2002-2005 Lexus SC430 2005-2007 Toyota Avalon 2003-2005 Toyota Celica 2004-2006 Toyota Prius 2004-2010 Toyota Sienna 2007-2012 Mazda 6 2004-2008 Mazda RX-8 2003-2005 Lincoln Aviator 2003-2006 Lincoln LS 2005-2013 Porsche Boxster 2005-2013 Porsche Cayman 2006-2011 Porsche 911 2006-2011 Porsche Carrera (997) 2004-2009 Land Rover LR3 Replaces the Following Part Numbers: 81107-2D020 85967-0E020 DDLT002 KDLT002 81107-48180 81107-48190 81107-48210 81107-51050 81107-53040 Bulb Out Warning Light On? The bulb out warning light on your instrument cluster can signal that there is a problem with your headlights. While sometimes a bad headlight bulb can be to blame, it can also be a bad HID ballast. Follow our instructions below to confirm if your HID ballast is bad. Fix Your Headlights for a Fraction of the Cost! Remove the Headlight Bulbs! If you just noticed that your headlight is out, open your hood and access the headlight bulb through the access port in the back Inspect the Headlight Bulbs! Remove the headlight bulb and inspect it for any discoloration or cracks. A good headlight bulb will look like the one pictured above. If no discoloration is present, switch both headlight bulbs from one headlight to another. Replace the HID Ballast! If the same headlight still does not light up replace your HID Ballast.