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TL take a D2S type HID bulb available online. If the ballast unit is bad you can find them on ebay a lot cheaper. It's located on the bottom of the headlight. I've even seen full headlight units with the bulb and ballast unit included for a couple hundred on ebay. That would be the easier way to go if you aren't handy with car work. To replace the bulb you need to pull the whole headlight out because Acura uses a security type bolt to secure the back cup onto the headlight. Once the headlight is off the car it's easy to remove the security bolt though with needle nose plyers
make sure that the bulb you are using is a 9005 ive seen people instal the wrong bulb and it doesnt work. Same plug different filaments. If thats not the problem maybe a headlight switch acting up. Hope this helps! ~Derek~
If you do not have a sealed beam assembly, then remove the four screws on top...when the headlight assembly comes out unclip the harness from the bulb assembly. Pull the bulb out and replace...don't touch the halogen bulb with your fingers...just the plastic base.
If your car is running daytime running light system .. there is a DTR relay that goes defective and needs replacing ... I had the identical problem that was fixed with this replacement. The DTR relay is behind the glovebox.