Electrical
2 compatibility entries for Acura
Factory OEM HID kit (Matsushita ballasts with D2R bulbs)
The 1999 Acura TL's OEM D2R HID system is the best-fitting HID option for JDM H4H headlamps (EG Civic J-spec one-piece lights; the same approach was established on JDM DA Integra lamps). The D2R base width is almost identical to the H4H so the bulb does not shake in the socket, and the arc position matches the H4H filament placement, preserving essentially the stock beam placement - the bulb sits only about 1/8 inch further back due to the large HID plug, which also prevents the bulb falling through the housing. Use D2R (with the light-blocking stripe for reflector housings), not D2S. Nothing bolts up: bulb base, seal, retention clip, and harness all require the modifications described. High beam function is lost since the dual-filament H4H cannot be replicated by the single-arc HID. OEM D2R/D2S bulbs are cheap, non-brand-specific, and available from any dealer or eBay, and an unmodified factory kit is more reliable than a rebased aftermarket kit.
TSX OEM HID projectors (D2S)
Genuine Acura TSX HID projectors with D2S bulbs and HID ballasts fit inside the stock EG Civic headlight housings, but nothing bolts up - housing cutting, bracket fabrication, and custom wiring are all required. On these newer TSX projectors the projector's front half has the cutoff shield molded into it, so no external shield is needed. The original author retained the OEM fluted glass lens and reported a clean cutoff on the completed driver's side; required extras are the two projectors, two D2S bulbs, two ballasts, L brackets, machine screws and #2 washers, silicone, Loctite, and a harness. Keeping a spare set of EG headlights is recommended if the car is a daily driver, since the conversion is permanent.