02 Windstar Autolock

I am trying to disable the autolock on my 02 Windstar. I've gone through the procedure in the manual using the keypad. When I do, it honks once just like it is supposed to, but when I start the vehicle it still locks. I've tried it several times and it honks twice when I disable and once when I enable but it has no effect on the locking. Any ideas what I'm doing wrong?

The Dealer can shut that off for you with thier diagnostic tools.