Your high beam switch is bad most likely.
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: Buick Century wipers out of sync
You could also see if the bolts holding the wipers on came loose from the snow and ice. Pop the cover off, loosen and straighten the wipers where they should be and tighten.
SOURCE: 99 buick century headlights
u changed the multifunction switch or the main head light switch?
SOURCE: 1999 buick century headlights won't come on
The switch needs to be replaced. Over time and use the wires tend to break off their contact points. Hope this helps.
SOURCE: How do I replace the dimmer switch on a 2000 Buick
there are star or Philips screws on under column and you remove these to open column shell and parts and schematics can be found at http://www.rockauto.com/
The Buick Century is equipped with a
multi-switch. This switch is an all in one switch that controls your
cruise control, windshield wipers and turn signals in one switch. This
switch also controls dimming and brightening of your headlights. The
dimmer switch is simple to replace, and all you need is a phillips head
screwdriver to complete the task.
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