Why is the daytime running light on my Lexus LC 500 fading or dead?

Short answer: Fading or yellowing in an LC 500 DRL is usually the light guide inside the headlight wearing out, and owners say it gets worse. It's sealed inside, so the fix is a new or rebuilt headlight. One owner was quoted over $2,600 for a new one. If a DRL goes dark suddenly, check the stalk setting and the connector first.

Symptom: The DRL looks dim or patchy, often fading at the top, or turns yellow. Or one side stops lighting at all.

What to check first

1. Make sure the light stalk isn't set to DRL off.
2. Unplug and replug the headlight connector.
3. Compare both sides in daylight and at night.
4. Get quotes for new, used and rebuilt headlights.
5. Ask Lexus whether any warranty or goodwill applies.

Likely causes

1. Degraded DRL light guide. The DRL shines through an acrylic light guide, a clear plastic strip that spreads the light. An owner who rebuilt LC headlights said it yellows from UV exposure over years, and the part is sealed inside the headlight.
2. Failed DRL LED or connection. If one side goes completely dark, it can be the LED module or its plug. One owner suggested unplugging and replugging it first.
3. DRL switched off. Check that the light stalk isn't set to turn DRLs off.

What it usually costs

One owner was quoted over $2,600 for a new LC headlight. Owners say used assemblies save a lot, and a rebuild is another option.

Is it safe to keep driving?

Yes, if your low beams work. Many states require working DRLs or headlights, so check local rules.

DIY or shop?

Swapping the whole headlight is a moderate DIY with the bumper off. Rebuilding the sealed housing is specialist work.

Recalls, bulletins and complaints in plain words

• Recalls: NHTSA lists 4 recalls for the 2018-2020 LC 500, and none are about the DRLs. Its lookup returned no recall data for 2021-2025. Check your VIN at nhtsa.gov/recalls. If your car is part of a recall, the dealer fixes it for free.
• Plain words: The complaint count below shows how often owners reported problems that mention these words to NHTSA. A count is not proof of a defect.
• NHTSA complaints: 3 keyword-matched complaints for Lexus LC 500 2018–2025 (of 10 unique complaints queried, NHTSA complaints API by model year, queried 2026-11-01; keywords: headlight, drl, daytime, lamp, light) (NHTSA returned no data for 5 model-year queries). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In DRL failing? on Reddit r/lexuslc500, a 2018 LC 500 owner at about 59,000 miles saw the driver-side DRL fading at the top, with both looking yellow. An owner who has opened and rebuilt these headlights said the DRL is failing and will get worse, that disconnecting the battery won't help, and that the yellowing is the acrylic light guide, not the LED, sealed inside so the whole assembly usually has to be replaced or rebuilt.
• In LC500 dead DRL (daytime running lights) on Reddit r/lexuslc500, an LC 500 owner's left DRL died. Replies said the whole headlight likely needs replacing at a high cost, and to try unplugging and replugging it and make sure the stalk isn't set to DRL off first.
• In FYI… $2,600 for a headlight. Lol on Reddit r/lexuslc500, an owner whose son clipped a curb was quoted over $2,600 for a new LC passenger headlight because the mounting hardware broke. Others said used parts save a lot for DIY, and the shop was able to secure the cracked bracket instead.

Quick tip

Don't buy a battery-reset fix. If it's fading, the part is wearing out. Shop around for a rebuild or a used light.

Vehicle focus: Lexus LC 500 and LC 500h, 2018-2025, especially early cars.

Safety / mechanic note

Make sure the headlights still aim right after any replacement. Verify with a mechanic.