Flashing seatbet light on F150

Have a 1996 F 150 302 5 speed, the seatbelt light is flashing what seems to be a code, 1 flash short pause 4 flashes and a long pause then it starts over.
I've been unable to find any information on this even the dealer can't or won't give any information.
Any ideas

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.