How to Fix One Daytime Running Light Being Dim?
3 Answers
Start the vehicle's engine and turn on the daytime running lights to observe. Check if the voltage at the connector of the non-functioning light is normal. If it is normal, it indicates that the daytime running light is damaged. If the voltage is abnormal, check for any short circuits in the wiring or if the fuse is blown. Replace the fuse if necessary. If there are no issues with the wiring, you can remove the light cover to inspect the bulb. Simply replace the daytime running light bulb. After completing the inspection, turn off the vehicle's engine and close the doors properly.
My car also had the issue where one daytime running light (DRL) was brighter than the other. That time, the left light suddenly dimmed, and I thought it was a minor issue, but it turned out to be a bit dangerous while driving. After checking, I found the most common causes are a bulb nearing burnout or poor contact, so I decided to inspect it myself. First, I removed the bulb and gently wiggled it with a screwdriver to check if the filament was broken or the base was loose. If the bulb was fine, I then checked the fuse—the fuse box is usually near the engine bay—and located the DRL fuse to see if it was blown. If everything seemed okay, it might have been a wiring or control module issue, in which case it’s best not to tinker further and just take it to a repair shop for diagnosis. After fixing it, I realized how important DRLs are for alerting other vehicles during the day and ensuring safety. I recommend regularly replacing bulbs to prevent similar failures.
During vehicle usage, it's quite common for one daytime running light to be brighter than the other. I believe this often stems from the bulb nearing the end of its lifespan. First, conduct a self-inspection - replacing the bulb usually solves the issue. The operation is simple: open the engine hood, locate the daytime running light position, unscrew the fastener, remove the old bulb and install a new one of matching specifications. If replacement doesn't work, it might indicate a blown fuse or wiring issue. The fuse box is typically located under the dashboard or in the engine compartment - consult your manual for exact positioning. Never overlook this problem, as daytime running lights protect pedestrian safety in foggy conditions or shaded road sections. A single repair can prevent accidents. Make it a habit to check light conditions during routine maintenance to prolong equipment lifespan.
