What are the reasons for the BYD Song's low beam not working?
3 Answers
The reasons for the BYD Song's low beam not working are: 1. Fault in the front compartment power distribution box; 2. Wiring fault; 3. Bulb fault; 4. Combination switch fault. It is recommended that the owner go to a 4S shop or professional repair shop for inspection and repair. The low beam is used when the distance to the vehicle ahead in the same direction is relatively close or when there is sufficient road illumination. Beyond the focal point, the emitted light is divergent and can illuminate a relatively large range of nearby objects. Taking the 2021 BYD Song as an example, its body dimensions are 4600mm in length, 1830mm in width, and 1700mm in height, with a wheelbase of 2660mm and a fuel tank capacity of 63 liters. This car is equipped with a 1.5T turbocharged engine, with a maximum power of 118kW and a maximum torque of 245Nm, matched with a 6-speed manual transmission.
My BYD Song also experienced the issue of the low beam not working. At that time, it was due to the bulb aging and burning out, as bulbs are prone to failure under high temperatures and bumpy conditions, with a limited lifespan. I checked the fuse in the fuse box under the dashboard to see if it had blown, as excessive current commonly causes fuse burnout. Poor contact or short circuits in the wiring could also be the culprit, especially with aging wires that are more likely to malfunction in rainy weather. Relay failures, control signal errors, or switch wear can all lead to the lights not turning off but failing to illuminate. I recommend having the technician test the headlight system during regular maintenance. The BYD Song is designed to be stable, but the lifespan of electrical components decreases with usage. Replacing them in advance can save money and ensure safe driving—don’t risk driving at night with faulty lights.
Having played with cars for many years, I've encountered situations where the low beam lights of a BYD Song don't work, mostly due to simple issues. A burnt-out bulb is the most common culprit, and the solution is to buy a new bulb and replace it—just a few bucks will do the trick. Blown fuses are also frequent; locate the corresponding position in the engine compartment fuse box and replace it, but be sure to check why the current was too high to avoid recurrence. Wiring issues, such as loose connectors or short circuits, require a bit more time to fix. Problems with relays or switches are more complex—it's advisable to test the voltage and avoid DIY tinkering. BYD models have reliable circuits, but aftermarket LED lights might overload the fuse. Don't act recklessly—safety first, get it fixed promptly.
