just encountered the same thing. check the headlamp relay
The fuse/relay box is under the hood on the passengers side. The box is located between the battery and the firewall. I recently had to replace the same relay after my headlamps stop working on low beam. This relay is located in the number 11 slot. I understand this is a common problem on the Buick Lacrosse. Hope this helps.
A TNS relay is located in the fuse box of a vehicle. It controls the vehicle's turn signal lights, running lights, taillights, and dash lights.
fuse relay wiring switch
The turn signal relay and hazard relay may need to be replaced, see your dealer You may have a short.
on mine it is right behind the glove box
call your local parts store.
The lights will go out after a few mins after you shut off the car...but if you want to turn off the Daytime running lights or the automatic headlight control, you have to pull either the relay or fuse for the DRL
To disable the running lights either unplug the relay to the fuse box. Also there is a fuse for this in the fuse box remove this and that will disable the lights.
Which relay is the starter relay on a 1994 buick lesabre
There are relays in under or by the grill
it is the Daytime Running Light(drl) it is what makes your lights come on automatic!