There is a light sensor locate up in defrost area of dash cover that controls the on and off of head lights
SOURCE: 1999 Buick Century headlights don't work properly
Iam an ASE Certified mechanic and i had the same problem with my 99
century and i wasnt able to drive at night. After hours of testing
wires we came to the problem. Its the turn signal switch assembly which
is tied into the hazard switch on top of the steering column. Its all
one piece with a 3 foot long wiring harness attached to it running down
the bottom of the steering column and going underneath the dash. The
least expensive place i found the part and had it in stock was my local
Auto Zone and still the part was $200.00.
P.S. This is a common problem on these GM cars. Mine did the same thing to the tee! The lights will go on and off then they just went off for good and this solved the problem. I guarantee it. If you have any questions please email me i will do all i can to help.
SOURCE: headlights won't come on
both headlight bulbs need changing/ check the fuse first under the dash and in the engine compartmentplease rate my response thank you very much
SOURCE: 99 buick century headlights
u changed the multifunction switch or the main head light switch?
SOURCE: headlights both quit working at same time,fuses
If both lights quit working, then either the switch or the fuse is bad.
SOURCE: 1999 buick century headlights won't come on
no low beams on my 1999 buick century change headlight bulbs and still no low beams
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