I previously had trouble with my Prius key flying out at me (which I've gotten better with, it hasn't flown out at me since I wrote that post).
What I've linked to above is a problem with Nissan/Infiniti and their key fob.
The blog “The Consumerist” wrote:
Our pocket holds two things: our keys and our cellphone, so it's a good thing we don't own a 2007 Nissan Altima or Infinity G35. The intelligent I-Key used to start those models can be turned into a paperweight if placed within an inch of an active cellphone.
The solution: keep the two at least an inch apart.
Not really a “Root Cause” solution, is it, telling the customers to keep the key and phone apart?
Toyota is known for putting themselves in customers' shoes, including the case where their lead engineer drove a minivan all across the U.S. and Canada to understand what a minivan customers' needs were, including the need for cupholders — lots and lots of cup holders!
How Nissan could not understand that people might put both their cell phone and key fob in their pocket everyday is mind boggling. I keep my Prius key and my RAZR phone (both are pretty tiny) in my pocket together all the time, with no problems thankfully!
The concept of “Genchi Genbutsu” (or “go and see”) doesn't apply just to the factory floor, in extends to your customers. Telling customers to not do things isn't smart design.
Nissan could have very easily foreseen this problem if they had used very basic “Failure Mode Effects Analysis.” FMEA is a pretty commonly used design tool — did they use it and ignore the keyfob problem for some reason?