Hi,
I have an 03 Expedition...My back up aid stop beeping ,When I put the truck in reverse the console tells me the backup aid is OK. I also put my ear to all four sensors while in reverse, and can hear them clicking.I checked the connections on the module and the plug on the little speaker.Anybody know the problem...Thanks Joe

 

Check for damage to the wires, starting at the rear. Squirrels love the taste of Ford wires. If that's the problem, put some Tobasco sauce on them after the repair.

 

Thanks Mel ....Wires..sensors...all seem intact ..would message center read backup system OK if there was wire damage or a bad sensor?