Help With Low Beam Relay Wire Location

[PlatinumES00]

Hello -

I need to tap into the relay wire for the low beam headlights on a 2000 ES300 w/xenons. Anybody know where this wire is located? I've located and tapped the VSS, and parking brake sensor. The wire tap is needed for enabling the nighttime mode on a Ecplise nav system, it needs the signal that tells it when the lowbeam headlights are on. My wife leaves the headlight switch on the 'auto' setting all the time (if that makes a difference on which wire to tap), also the car has daytime running lights. I didn't think I needed to hook this wire up, but after seeing what nighttime mode looks like in another car, it would be nice to have it enabled.

thanks for any suggestions/info - a picture would be great!