How do i get to the ballast that operates the hid bulb on driver side on 2002 Lexus LS430

driver side low beam works sometimes it will work for hrs , cut off and next day i crank car it wont work etc. switched bulbs from left to right still same problem , fuses are good,dont know where ballast is , found used one on ebaymotors for 100.00 dealer 995.00 new,i think its called light voltage control module

Asked by for the 2002 Lexus LS430