Here you go I found it
*The RAP (Remote Anti-theft Personality) module is fastened to the top of the firewall directly behind the fuse box. It can be reached easily when you lie on your back in the driver floor area with your head close to the brake pedal. Just look up and you'll see it is clearly marked and the sticker also displays the factory-set access code for your truck.
Hope your 2004 is the same place
Originally Posted by tampc
I have the same problem My truck 2003 They want to charge me too, let me know if you fine some thing, I will let you know if I do find it.... good luck