Could be a bad or misaligned stop light switch at the upper end of the brake pedal under dash area
Parking brake is on, Brake fluid is low, Hydraulic failure of the brake system.
If you mean the brake lights are stuck on, then check the stoplight switch located on the top of the brake pedal.
Possibly a bad alternator (the system is not charging the battery).
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It sounds like you have a faulty micro switch on the brake pedal.
Do you mean What does it mean when the brake and battery lights come on in when it is already started? Check your alternator may be its not working well it cause the battery sign comes out.
If by 'controller' you mean the switch that makes the brake lights come on, it is not in the trunk. It is located underneath the dashboard, next to the brake pedal.
this happened to me on my 98 Honda accord and it was because my brake lights and sinal lights were not working properlyMost likely, the brake light switch is stuck. Have you checked your brake fluid level? You could be dangerously low.If you mean that your exterior brake lights stay on even when you aren't pressing on the brake pedal, you most likely have a bad brake light switch.If you follow your brake pedal arm up under the dash, you should see a switch that comes in contact with the arm. It might have been knocked out of position and all you need to do is put it back. If it is in its correct position, it is probably bad and will need to be replaced.It works like this...when you press on the brake pedal, the arm moves away from the switch, thus turning on your brake lights. When you release your foot from the brake pedal, it contacts the switch and your brake lights turn off.
Assuming you mean brake lights, the brake light switch is broken or out of adjustment.
Brake lights on can mean no brake fluid, worn out brake pads, faults in the master cylinder. Must take your car to the garage immediately. Worn out brake pads can damage the discs which are expensive to change.
Low brake fluid level - due to leak or worn brake pads Parking brake not fully released
if you mean the brake light on the dash... fill your brake fluid as it's probably low If you mean the brake lights outside the car, your switch is shorted and needs replacement, or you need to lift your foot off the pedal