you have to open the trunk and behind the carpet you have to pull off, and then unscrew the bolt and push in the sides to open and then you will see a light bulb and then replace it.
License Plate Light Bulb Size: 6418
changing the bulb
How do you replace 2001 Mercedes c320 front marker light
How do you replace the rear brake light bulb on a 2001 Honda civic?"
inside the trunk there should be a small door behind the light assembly with access to the bulb
Burned out exterior light bulb.
Burned out exterior bulb
Just replace the light bulb.
See sources and related links below for 2000 VW Volkswagen Jetta light bulb lamp part numbers.
Typically the low and high beam are H7 bulbs. The day time running light (DRL) bulb is a P21W bulb (1156 is an acceptable substitute).