Where is the restraint control module location?

In an F series it's under the center of the seat, in one with a console it is at the rear of the console at the front edge of the center seat section. You have to remove the console then release the seat center and it's more or less spanning that split area. Be sure the connector retainer seats fully on the replacement. You don't want a loose connection at that module.
Did you check the seat belt pretensioners to see if they deployed as well? Normally those will go off even if the belt isn't being worn and need to be replaced as a set.