Airbag Code 18?
 

I have a 2008 F-250 super cab that was a fleet vehicle prior to my purchase. It’s flashing an airbag code 18. Knowing that this truck had extra electrical equipment controlled by the up fitter switches and a security cage in the back that was removed prior to my purchase, I’m suspicious that they messed something up during the de-installation.
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Anyone have any ideas on the code 18? I can’t find anything definitive at all.
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Thanks