2. Check the brake light switch. The brake light switch is located under the brake pedal. It is a small, black plastic switch that is activated when you press the brake pedal. If the switch is faulty, it will not send a signal to the brake lights to turn on. To check the brake light switch, press the brake pedal and see if the brake lights come on. If they do not, the switch is faulty and needs to be replaced.
3. Check the brake light fuse. The brake light fuse is located in the fuse box under the hood of your vehicle. It is a small, glass fuse that is typically labeled "brake lights." If the fuse is blown, replace it with a new one.
4. Check the brake light wiring. If the brake light bulbs, switch, and fuse are all good, the problem may be with the wiring. Check the wiring for any damage or loose connections. If you find any damaged wiring, repair it or replace the wiring.
5. Have the vehicle scanned for diagnostic trouble codes (DTCs). If you have tried all of the above steps and the brake lights still do not work, you may need to have the vehicle scanned for DTCs. A DTC is a code that is stored in the vehicle's computer when a problem is detected. A scan tool can be used to read the DTCs and help you diagnose the problem.
If you are unable to diagnose and repair the problem yourself, you should take your vehicle to a qualified mechanic.
