Under the dash near the brake pedal lever.
It is quite easy to install the 1992 Chevy Lumina brake light switch. The brake light switch simply plugs in and out.
the brake light switch is on a bracket just above the brake pedal.
Normally this is an indication of a defective brake light switch.
Brake light switch failure, bad ground wire at rear of vehicle or fuze blown.
Check for a blown brake light fuse ( in the fuse panel ) or the brake light switch at the brake pedal could be the problem. The brake light switch releases the shifter lock as well as operating the brake lights.
Switch is defective or out of adjustment.
It will be mounted to a pressure port on the service (foot) brake valve
Start with checking the fuse, then the bulbs, then the brake light switch, then the wiring. If all that checks okay I would suspect the signal switch.
Above your left Knee when you are driving
Check the bulbs, Check the fuse, Check the brake light switch, in that order.
APPLY BRAKES AND SEE IF BRAKE LIGHTS COME ON. IF NO BRAKE LIGHTS, REPLACE THE BRAKE LIGHT SWITCH LOCATED ON THE BRAKE PEDAL ARM AND THIS SHOULD ALLOW YOU TO SHIFT OUT OF PARK. IF THAT BRAKE LIGHT SWITCH IS BROKE, YOU WON'T BE ABLE TO GET IT OUT OF PARK
Change out the flasher relay located under the dash. Not the brake light switch which is activated by the brake pedal. Replacing the relay should solve the problem.