most likely, you can grab the unit from the back and twist it out. instead of the entire unit coming out, just the bulb should come out and replace the bulb. keep in mind, if it is a halogen bulb, DO NOT TOUCH THE BULB ITSELF WITH YOUR FINGERS. the o...
Consult your owners manual if you have it, I have an 02 Sentra and I believe you have to get at the bulb from the back of the light fixture, ie, inside of the engine. Try the Nissan website and see if you can download a manual in PDF format if you do...
Ask a guy at the store, like at petco or at petsmart or something like that, but ask a person who knows. Be picky about who you ask.