Reverse Sensor

[kfanta]

I have a strange problem that only appears with the temp outside gets above 70 degrees. So for the winter my reverse sensor works perfect however it has started to get warm here again and this problem occured last year, but I did not drive the truck much so I could not figure out when it came one. Now I do and I finally figured out when it comes on, but I don't know where to look for the problem.

Here is the problem as soon as you put the truck in reverse the beep goes of continuously not intermitant beeps, but the long beep. It also has to be around 70 degrees or higher. There is nothing even remotely close to being behind me. No the truck does sit out in direct sunlight during the day which is when it happens the most, and it has been completely dry out for the last several days so I know they are not wet...

Any ideas where to start looking to see what is causing it. I also have not been running the A/C since it is the perfect temp for driving with the windows down.