Driver's Seat Position Sensor
WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.
The driver's seat position sensor (N) is under the driver's seat on the left side. When the driver's seat is moved all the way forward, the deployment of the driver's airbag is moderated to decrease its force of impact during a front-end collision.