The DRL and the high beams use the same bulbs so it sounds like the bulbs are fine.
Have the DRL ever worked? If not, maybe a previous owner cut some wires. One place where some owners cut wires to turn DRL off on a 98-00 LS400 is at the DRL relay under the dash -- I think the relay on the passenger side.
Do the low beam headlights come on automatically when it gets dark when the headlight switch is in the "Auto" position? If so, that means that the light sensor on the left side on top of the dash is OK.
i figured it out
i just put it in drive and then turned the switch from auto to off and back to auto.