Nissan has been fairly logical about the usage of its keyless entry transmitters. However, there is one situation that confuses our competitors and consumers alike. Nissan used an iconic 4-button keyfob on nearly all Nissan and Infiniti sedans during the middle of the last decade. (Usually, it had FCC ID KBRASTU15 on the back of the case.) However, for the 2004, 2005 and 2006 Nissan Sentra, the keyless entry remote used has FCC ID CWTWB1U429. It is Nissan part number 28268-6Z700 (formerly 28268-6Z600). What is confusing is that this remote looks exactly like the 4-button KBRASTU15 remote, but the two are not interchangeable. So, if you are buying a replacement car remote for a 2004-06 Sentra, be sure you get the correct part.
Link to 2004-06 Nissan Sentra keyless entry remote.
This application is user programmable.