Many Nissan vehicles offer enabled keyless entry systems that allow owners to lock or unlock the doors of their vehicle with a small, electronic key fob. When the battery in the fob fails, or the fob otherwise malfunctions, you'll need to take apart the fob before you can begin troubleshooting it. Taking apart a Nissan key fob can be done in seconds and requires no special tools or experience.
Stand the Nissan key fob on its side and locate the seam where the two halves of the fob meet.
Insert a flat tool, such as a plastic guitar pick or quarter, into the seam on the side of the key fob.
Rock the tool back and forth to pry open the Nissan fob. After a bit of effort, the two halves will separate completely.