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Hello, my name is***** for the question. You need the ballast resistor/igniter assembly. This is what get the bulb up and glowing. The best way to repair this is as a complete assembly. If you are going to try and replace just those parts make sure that tou purchase genuine toyota/Lexus parts otherwise it will not last. Let me know if you need more help.
If you can find a used one they would typically run a couple hundred dollars. Try a good used company like LKQCORP.com