Probably a brake light switch.
1 of 3 reasons why, your head lights are on, your reflector lights are on ,or your brake sensor is broken
Brake lights could stay on in a 1999 Dodge Stratus because of a short in the wiring. If the headlamps are off and the brake lights are still on, check the wiring for the brake lights that is inside the trunk. Sometimes cargo in the trunk can interfere with the lights.
check the brake light switch
Bad brake switch
The brake relay switch is bad.
If the brake lights stay on that probably means the switch on the brake pedal that activates them is defective.
Adjust the brake switch which is above the brake pedal.
the brake lights are on a separate cuircut,if your brake lights are staying then it will be a fault with the brake light switch. the switch is located under dash,and will be on or very close to brake pedal.
Brake light switch out of adjustment or defective
It is probably the brake lights that are on due to a misinstalled or damaged brake light switch.
The brake lights on a 96 Jimmy are operated by the brake light switch, mounted on the brake pedal assembly. If the switch is bad the lights could stay on or off, or be sporadic.