backup sensor

[powercat]

It appears the backup sensor just went out on my 05 X 6.0L. The button on the dash says "OFF" all the time.

Any ideas on where i should start looking

[05 smoker]

with the truck on set e brake and put in reverse. go listen to the backup sensors. they should have a high pitch fast almost beeping sound to them. if you find one that sounds different then thats the bad one.
mike

[SharkDiver]

You can put your finger on it when its in reverse and you can feel the tapping if its working or listen to them. I have 2 bad sensors on mine but I dont want to spend the money to fix them, They arent cheap.