I have a 2005 Freestar se never been in an accident. Recently the airbag light has been flashing code 15. I was wondering if anyone knew how to fix this or what the problem may be? Thank you.

 

Here are the freestar LFC
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Thank you for the code info, I still have the code 15, so I replaced the airbag module and still have the error code 15.
I have changed almost the whole airbag system but was wondering if the front crash sensor could cause it or something else?
Running out of ideas on fixing it. Also when I took the light out it gave a code 14.
05 freestar se 4.3l
Thank you