I have a 2007 Nissan Quest I bought new. It has rear sonar as one of the options and due to the size, shape and blind spots it is needed. I noticed with 35000 miles that the rear sonar was inop- since I bought it for my wife, I was unaware it was inop for a while. It was not covered under warranty because I have owned it for 37 mos. After some research it appears it is not only common in all years of the Quest but the titan as well. The problem is a defective aural buzzer. When you have a fault somewhere in the system the off light should come on letting you know the system is off- however, it illuminates sporadically and what you think is a working system is really not- I have talked with people who were unaware the system was off until they backed into something causing minimal but expensive damage. I am an aircraft mechanic and cannot see how there is not a recall on the buzzer- when backing up looking behind you and using your mirrors there is a huge blind area in the back of the van that is caused by the gradual increase in the slope of the body panels. My concern is that it is a matter of time before someone gets injured. The problem is that Nissan uses a defective buzzer that they know will fail- it is a cheap fix for the dealers however for the consumer it would cost upwards of 400 dollars for a buzzer that can be purchased at radio shack for 5 dollars. I replaced mine with the original Nissan part that cost 60 dollars and find it offensive they have not voluntarily fixed a problem they know exists- it is safety related and as someone who fixes jets for a major airline, safety is first and foremost along with a reliable, dependable product. This should be a recall. Thank you

- Douglasville, GA, USA