Used this same method to turn off the seat belt chime on my 2007 2500, my new 2012 Ram 3500, a friends 2008 3500, my Mom's 2014 1500 Eco diesel and my Grandmother's 2006 Jeep Liberty.
NOTE: The following steps must occur within the first
60 seconds of the ignition switch being turned to the ON
or START position. Chrysler LLC does not recommend
deactivating BeltAlert.
1. With all doors closed and the ignition switch in any
position except ON or START, buckle the driver’s seat
belt.
2. Turn the ignition switch to the ON position and wait
for the Seat Belt Reminder Light to turn off.
3. Within 60 seconds of turning the ignition switch to the
ON position, unbuckle and then re-buckle the driver’s
seat belt at least three times within 10 seconds, ending
with the seat belt buckled.
4. Turn the ignition switch to the LOCK position. A
single chime will sound to signify that you have successfully
completed the programming.
BeltAlert can be reactivated by repeating this procedure.
NOTE: Although BeltAlert has been deactivated, the
Seat Belt Reminder Light will continue to illuminate
while the driver’s seat belt remains unbuckled.[/QUOTE]