Why are the rear lights not working when the brake is applied?
check the fuse. or it might be the switch down by the brake pedal that controls the brake lights also you might have blown out bulbs....
Do the turn signals and hazards work? Are these the LED lights.
05 deville turn signal or brakes lights not working
Looking for a Used DeVille in your area?
CarGurus has 1,272 nationwide DeVille listings starting at $1,988.
Search Cadillac DeVille Questions
Cadillac DeVille Experts