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The URO Xenon Control Unit (Ballast) - Priced Each - BMW & MINI is an essential component for ensuring the proper function of your BMW or MINI’s HID headlights. If you've replaced the bulb in one of your HID headlights and it still isn't working, the issue is likely with the igniter or control unit. The igniter and control unit work together to regulate when the HID lights turn on and begin emitting light, and a faulty control unit can prevent the system from functioning.