It sounds like the LED controller built into the center stop light is malfunctioning. The only suggestion I have is to replace the light strip.
SOURCE: 1995 Cadillac STS 3rd brake light OUT?
No it wouldn't be a fuse because it's partially still working,LEDs are wired in series so it could be one LED is burnt out or the current limiting resistor has opened for that section.Repairing it would be fairly simple but will require a multimeter preferably with a diode tester and a soldering iron.If you're not familiar with using a multimeter and testing electronic circuits I would say let a professional repair it or replace the whole unit.Comment back and I will give you the test procedures if you fell confident in making the repair.
SOURCE: Brake lights don't work on
First check your owners manual for fuse box location and check for any blown fuses. Next check the brake peddle under the dash for a switch, which is mounted to the peddle arm and turns on the lights when the peddle is pressed in. If the switch has worked loose and is not being pushed when you are pressing the peddle the lights will not come on. Hope this helps Fix Ya up.
SOURCE: 2009 cadillac dts driver tail light is not working but lights up fully with brake?
I have a 2006 dts my third brake light is partly out what to do?
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