2007 Cadillac Cts Brake Lights Not Working. Cadillac will not tell you, but this is a common problem that is part of a service bulletin that requires reprogramming of the body control module due to computer ground fault of the brake lights. To access the bulbs in the rear tail light housing, remove the plastic panel covering the trunk lock, and pull outward on the side trim panels.

The contact stated while driving various speeds the third brake light would not illuminate upon depressing the brake pedal and the rear brake light plastic panel housing was faulty. The brake lights will not work at any time when the pedal is depressed. A burnt out center brake light bulb in your cts is an excuse for a police officer to pull you over.