if you have a haynes manual or chiltons it will tell how to test the multifuction switch(the high beam lever) and what ohms should be reading out of it. and if that checks out there is a module that could be the problem, it calle the fcm which on the 01 model is on the front of the fuse box ( not sure about the 99 model but all you have to do is take it off and bend (very little) the pins down and add little bit of dielectric grease and put spacers on the bottom two screws as to tilt the fcm to ad in the contact. but check you lever first and I'll bet you'll find that is you problem
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