GMC Repair: 99 buick century rear brake lights and turn signals not working, rear lamps, multifunction switch

Question
I have a 99 Buick Century Custom with a 3.1 liter engine. I replaced the bulbs and this didn't fix the problem.  The only one of the brake lights that work is that one in the window.  I don't know what to do.  My tail lights don't work and I don't want to get a ticket for brake lights or failure to signal.  What is your expert opinion?!

Answer
Hi
I would STRONGLY suspect the multifunction switch, located on the stweering column.
Since the CHMSL works, then you can eliminate the fuses, brake switch.
The multifunction switch allows power to flow the the rear lamps.
I Hope this helps.
Good Luck
PAwl