After reading through many threads on PC, I realize that my bulb issue is most likely related to the bulb and/or the ballast. Is there a way to diagnose the issue to see if it is one, the other, or both?
What is the issue? Some issues themselves will tell what the faulty component is. If problem is always on you can swap bulbs and see if fault changes side with bulb.
The passenger headlight shuts off or flickers. I have noticed this happening a lot when accelerating from a complete stop. On occasion, both headlights have shut off while driving, but it is mainly the passenger headlight. Quickly switching the headlights off and on (only once) turns both lights on again. I have noticed (or at least it seems) that the passenger headlight dims more than the driver headlight when first powered on.
Change the bulbs from side to side. If the problem goes to the other side it's the bulb. If the problem stays where it is it's the ballast. John (Britprius)
Labor for switching HID bulbs can be prohibitive. This is always a tricky prospect if you are paying a shop to change your bulbs as opposed to doing it yourself.
