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Buick Terraza was created in 2005.
It was the dimmer switch..
If none of the lights dim (including dash lights, speedo, etc) the dimmer switch is probably bad.
Check the dimmer switch
Take it to your Buick dealer is how.
Check the 1993 Park Avenue fuses first. Check the light dimmer switch to make sure that it is functioning. If these are ok, look for a bad wiring connection.
You can buy a Buick Terreza on the internet. Go to a second hand website or a car selling website and you can buy it there. Just a tip, look on Ebay. They have a lot of cars and things to sell and you can buy a Buick Terraza there.
Pull the turn signal stalk towards you to activate your high/low beams
Sounds like the light bullb\bulbs for you gauger cluster is out. You will have to remove the cluster to get to the back of this to change the lights.
You turned off the dash light brightness control switch or blew a fuse. If you have power at the dash illumination fuse, the dimmer switch may be faulty.
Check fuse for parking/tailights Could be a bad headlight switch Could be an open in the dimmer rheostat
Wear the seat belt as it was meant to be.