Inside the wheel well there is a small cover plate with 2 plastic screws which must be turned a quarter turn. The plate then comes out. Pull the plug off the back of the bulb. There is then a plastic collar which must be turned counter clockwise. To install, do the same in reverse.
For the 1994 model (B3000), you can't change just the bulb. You have to change the headlight assembly.
On some cars you have to replace the whole headlight, but in a lot of cars you replace just the bulb. At the back of the headlight, see if you can twist out the bulb socket. You may depress it while twisting it counterclockwise.
Replace headlight bulb only when blown.
To replace the headlight bulb in a 1994 Nissan Sentra first prop the hood of the car. Locate the headlights and remove the bulbs from the housing. Install the new bulbs.
Check out the enclosed instruction book.
On older vehicles you replace the entire headlight. On the newer vehicles you just replace the bulb unless the headlight assembly is damaged.
lift the plastic cover twist the old bulb out unplug it reinstall
How do you replace a 1999 Ford Escort headlight bulb?"
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How do you replace headlight bulb on 2004 Mazda Tribute?
I couldn't replace just the bulb. You have to buy a whole new lamp. $5-10 at autozone.
Try this link: http://wiki.answers.com/Q/How_do_you_replace_the_headlight_bulb_located_on_a_1994_Toyota_Camry