Hi,
I had some problems with the airbag in the past too.
Let's see if I can help you.
My light keeped on, not intermitent. Anyway, please check all the SRS components, airbag ecu, rotary coupler, front seatbelt pretensioners. First of all the connections checking if there are some shortcuts.
An ACR4 code reader would be helpfull, but they are pricey and difficult to have. I have one that I should share but I'm outside UK
I have some SRS spare parts too in good condition that should be helpfull, I buyed them when I had to repair my car.
And most important of all, PLEASE after touching anything from the SRS system, disconnect the battery and wait at least 30 minutes to discharge the remaining power in the airbag, it could explode accidentally causing serious damages.