What are the reasons for all brake lights not working?
1 Answers
The reasons for brake light malfunction are as follows: 1. Check the brake light switch. If the brake light switch fails, none of the brake lights will illuminate. During repair, you can try connecting the brake light switch with a wire. 2. Check the brake light bulbs. Frequent use of brake lights can cause bulb wear. When the filament breaks, the bulb won't light up. If your car's brake lights aren't working, inspect whether the bulbs are intact. 3. Check the fuse. If both bulbs and switch are confirmed to be functioning properly, inspect the fuse. Some vehicles don't have a dedicated brake light fuse but share one with other electrical devices. In this case, check the operation of other electrical devices in the car. Identify any non-functioning devices and replace the corresponding fuse. 4. Check the brake light wiring harness connector. Refer to the circuit diagram to locate the connector in the brake light wiring harness. Unplug it and check for loose or corroded pins inside. If found, repair the affected pins to resolve the issue. 5. Check the brake light ground wire. The tail lights on a car share a common ground wire. If this ground wire is broken or has a poor connection, the brake lights won't work. Therefore, inspect the ground wire and reconnect it if any issues are detected.
