Possibly blown fuse, bad brake light switch, or blown brake light bulbs.
Please check the Brake light switch....The brake light switch should be located near or on the brake pedal (up on the stem of the brake pedal)
The only thing that will work with key OFF is the brake lights,head lights and emergency flashers. Dome light will also work.
Because the brake lights are the priority circuit.
Often this type of behavior is caused by a bad ground for the lighting circuit. Check the ground circuit for the brake lights.
in dash lights
The running lights have a bad ground.
I have a 03 gran prix and my brake lights doesn't come on when I go to brake
on the brake pedal under the dash is a brake light switch. that when you depress the brake it turns your lights on. you might wanna check that
check the fuse, brake lights have their own, & check the brake switch at the top of the brake pedal
the brake switch at the pedal is stuck or out of adjustment.