What causes one side of the LED daytime running lights to suddenly stop working?

[AshlynMarie]

Abnormal voltage at the wiring connector, short circuit in the daytime running light circuit, malfunction, or bulb damage. Below are relevant details: 1. Inspection: Check if the voltage at the wiring connector is normal. Generally, passenger cars have a voltage of around 12V, while buses and trucks have around 24V. If the voltage is normal, inspect the daytime running light circuit for looseness, short circuits, or blown fuses, and repair or replace as necessary. If no issues are found, the daytime running light bulb may be damaged and needs replacement. 2. Repair Method: If the daytime running lights are not working, it is advisable to have them inspected at a 4S shop, as issues involving the lighting system and wiring can be complex. If you are not familiar with the wiring, you may easily damage the original vehicle wiring. Generally, it is difficult to repair such issues on your own.