D3S ballasts do not have an internal ignitor as it is attached to the bulb. This ballast can replace ANY factory D3S system. Leave original ballast in place (to prevent codes), wire this ballast to 12v connector, plug in D3S bulb. Save you or your customers thousands of $. Some makes have design flaws in their ballasts which cause premature failure, D3S replacement ballasts PERMANENTLY solve these problems. Talk to a tech today!