There is a campaign on the brake bulbs for 2000-2003......If it hasn't been done you should get it done. The bulbs and sockets will be replaced.
How_do_you_replace_the_lic_plate_light_bulbs_on_a_2003_cadllic_cts
Remove the screws that hold the covers in place. Replace bulbs!
Open the rear hatch and you will see the retaining screws inside the door frame.You can then drop the light out to get access to the bulbs. If no bulbs are bad then you may have a bad circuit board.
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Open the trunk. Loosen the black thumb latch wing nuts that hold the tail light assembly in place. pull the tail light assembly out. You should be able to acces the tail light bulbs to replace them.
You have to start by taking off the grill. Then you need to pull out the whole light houseing. When you have the whole light off its easy from there. Just remember not to touch the light bulb with your fingers.
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The bulbs are LEDs (light emitting diode). It is a set of bulbs, fused together, you cannot change individual bulb. You can buy a set from any dealer or from the Internet and change it by yourself or you can go to a mechanic.
Very carefully
You will need a Torx T15 driver and however many 921 bulbs you have burned out. There are 3 bulbs in the center high-mount brake light assembly. Remove the 3 Torx screws right on the face of the plastic bar and the assembly, with the 3 bulbs mounted, comes down. The bulbs pull straight out of their sockets. Push the new bulbs into the blade sockets. Put the assembly back in place and replace the 3 screws.