For the 04/05 low beams (what I'm assuming you're looking at), if you stand in front of the headlight and look straight down at the low beam socket area, just below it is a small (10mm?) bolt head. It's in a socket with the top side cut away, and you can see a sort of toothed wheel in there. That's your vertical beam adjustment. Pop a long phillips head screwdriver in there and crank it around.
In the service manual, it should be around pp. 22-78, I think. Mine's for the 02/03, though, so the pages might vary slightly for the later model years.
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