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I have googled and found many people asking this but nobody answered conclusively. Numerous Answers.com and Fixya "expert" replies but they are all BS.
In my 2001 RX300 the left low beam does not come on when the switch is in the On position, and the left parking lights remain on. The right low beam comes on and the left parking lights go out.
Both high beams work (those are separate bulbs).
I replaced the left low beam bulb (non-HID), the new one does not work either.
If I turn on the fog lights, the left low beam comes on (the old bulb works too) but the left parking lights remain on.
Anybody seen and solved this? Looks like a relay issue, I need an electric diagram...