have u checked the bulbs? its rare but sometimes both bulbs can blow and you will still have High beams i would check the bulbs and even try new bulbs to start. i have seen that a few times where i work. try it let me know
i may be wrong here, is the high and low on the same bulb or on seperate bulbs. i have high beams and if the lows are the bulb above it then i have them but they are real dim, i tried adjusting but very little success. just not sure if they are together or seperate on a 2000. toyota says they are together on the same bulb, it is a 9005 bulb, but it appears they may not be.