air bag flashing, air bag connector fastener, '95 Altima

I'm getting a flashing air bag light. I have OBD-1. The Snap-On OBD-1 reader at a local shop can't read the air bag codes without a
special add-on.
Is there any way to obtain the air bag codes through the flashing of the Air Bag or Engine Needs Servicing lights?
There's a Nissan notice that a connector needs a fastener or the flashing air bag can appear.
Anyone know which fastener need the fastener? The car had the passenger air bag replaced years ago after a recall.
I have suppressed the flashing using the toggle the door switch but soon after driving the code reappears.
The windows were open during a rain storm. The car dried out. It was about this time the flashing appeared.
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