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Why is the tail light of BYD Tang always on?

2 Answers

DiKhloe

07/24/25 4:04am

BYD Tang tail light is always on for the following reasons: 1. Brake light switch damage: Damage to the brake light switch can cause the rear tail light to stay on. Replacing the brake light switch can solve the problem. 2. Tail light circuit issues: If there is a problem with the tail light circuit, it should be repaired at a 4S shop as soon as possible. Introduction to car tail lights: Car tail lights include the lamps and bulbs at the rear of the car. One of the functions of the lamps is to gather and emit the light from the bulbs, thereby enhancing the brightness and range of the light emitted by the bulbs. The second function is to change the color of the bulb's light through the color of the lamps. Overall, the design of the entire car tail light involves disciplines such as optics, materials science, and structural science. How to maximize light efficiency while considering different shapes and lines, and perfectly integrating with the car, all test the designer's ability.

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DelAmy

08/10/25 11:39pm

I also encountered the issue of the taillights staying on with my BYD Tang, which was quite annoying. It could be that the light switch is stuck and not turned off, or the foot brake was pressed down but didn't spring back, causing the brake lights to stay on. A short circuit is another possible reason, especially if water gets in during rainy days or the chassis wiring harness is worn, causing erratic current flow. Once, after installing modified light strips, they interfered with the original system, and it took several restarts to get back to normal. I suggest you first check the light settings menu to see if the night mode was accidentally turned on, then try resetting the switch. Keeping the lights on constantly drains the battery—it can deplete it overnight, making it troublesome to even jump-start. It's best to have someone help you observe the car while you operate it to confirm the issue. If you can't figure it out, take it to a professional shop sooner rather than later to avoid bigger problems down the line.

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