Warning Light On problems of the 2008 Infiniti EX35

The dash board airbag warning light started flashing. It stayed flashing for a few weeks, so I took it to an Infiniti dealership. The dealership told me there was some type of communication problem between the acu and OCS units, located under the passenger seat. They said they couldn't tell any more than that, and would try replacing the acu first (this cost me over $1000). They then said if the flashing light came back, the next step would cost me over $3200 (replacing the OCS, I guess). I then looked online for others with this problem, as this part is inside the car, and wasn't damaged in any way (I have the old part, looks in perfect condition), so I was suspicious that this was a manufacturer's defect. To my surprise, when I searched for 2008 Infiniti Ex35, I found not one, but *three* recalls for passenger seat acu/OCS problems! when I asked the dealership why my repairs weren't covered under one of those recalls, they insisted there were * recalls for my VIN. Thus started my education about "VIN specific recalls". So naturally, I asked why my VIN wasn't included in any of these recalls - they answered "we don't know. " so, I asked, "who knows?" they then directed me to you (the NHTSA), which puzzled me, as I expected it was Nissan itself which decides what VIN's are covered and which are not - the Nissan representatives I spoke to insisted this wasn't the case. So, my complaint my VIN should be covered by (one of) these recalls. I find it extremely unlikely that my acu failed because of "wear and tear". I believe there is a common problem(s) underlying these recalls, which also affected my car. A manufacturer's problem.