Usually, the daytime running lamps cannot be manually turned on and off and are controlled automatically by the daytime running lamp module. The daytime running lamp module is the computer that controls the daytime running lamps, and any issues with the module can cause the lamps to not function properly. Usually, a bad or failing daytime running lamp module will produce a few symptoms that can alert the driver of a potential problem that should be serviced.
Some symptoms include:
1. Daytime running lamps do not come on
2. Daytime running lamps stay on while the car is off
3. Burning smell
Do take note if any of the symptoms are showing. If they are, you should have the vehicle inspected by a professional technician, to determine if your car needs a daytime running lamp module replacement.
As they are a separate light from the actual headlights, there is a low chance that you might need to change the whole headlight.