I've got a 2005 F250 with the RSS/backup sensor option. A few months ago, I had figured out how to disable the alarm for when I have my trailer connected through some series of turning the truck on/off, pushing the disable button, etc. However, I forgot where I found the instructions and can't get it to re-enable the sensor (even the "off" light on the button is always lit).

I've tried searching, but have had no luck. Any ideas?

-Shane