Many modern cars have Daytime Running Light (DRL) strips or accent lights inside the headlamp. Over time they can yellow, glow unevenly or go dark in places. The good news: on many models you can replace just that part.
What is a light guide?
A light guide carries and spreads light from its source (an LED chip) along a designed path, producing a smooth, continuous line of light. It is typically used for DRLs and accent lights inside the headlamp.
What is a module / chip module?
A module is the circuit or LED chip that feeds the light guide or controls the light. Designs differ from car to car.
Common symptoms and causes
- The strip has turned yellow or is no longer white: usually the light guide ageing from heat and use
- Uneven brightness or dark sections: an aged light guide, or failed LEDs on the module
- The whole strip is off: often the module, wiring or control system – check the electrics before replacing parts
Can you replace just that part?
On many cars, the light guide or module can be replaced on its own, without a new headlamp. It depends on the headlamp design, the condition of the parts and whether the exact part is available. Most jobs mean opening the headlamp, so fitting by an experienced headlight workshop is recommended.
Choosing the right part
- Match the make, model, years and trim (e.g. LOW / TOP)
- Check the quantity per side and per car in the product description
- Some modules come in versions (different number of chips or connector pins) – compare with the original part on your car