Buick Century 2000 No low / High Beam lights

I have a 2000 Buick Century That lost it's low beam and high beam lights. I have checked both left and right side lights on my 2002 Buick century and they work correctly. I also tested the headlight switch by exchanging it with my 2002 Buick century and it works correctly. I have checked the two 15 amp fuses for the headlights which were ok. I also checked the 20 amp fuse which was ok. Does any body know where the running control moudule is and how to check this out? Where is the daytime running lamps amient light sensor???

I have daytime running lights that work.. and If I hold the dimmer switch on the high beam lights will come on.

thanks
Joel

I'm not sure about the other thing your asking for but I would replace the dimmer switch, if it's sprong it could cause the lights not to come on. I had a Bonniville that the dimmer swiched acted the same way and after replacing it the lights worked fine.