Over the weekend my SRS warning light on the dashboard has begun staying on for about a minute after start up then goes out. SRS is secondary restraint system yes? Is this likely to be a problem with my air bag?
Interesting that your SRS warning light even goes out. I don't know when the cutoff was, but the late model T1N's store a code in the airbag module and will not go out until a dealer with the right tool resets it.
With that said, you are very lucky and you probably don't have to go to a dealer to have it checked out or reset. The airbags (from 5 difference vehicle manufacturers) that I have experience with have a value of 2 ohms. Most likely cause of this error is a clockspring or a wire chaffing.
For instance, if you follow the wiring to the non-airbag side of the clockspring, you should measure two ohms while turning the wheel. If at any point that 2 ohm value drops out then it's your clockspring.
In addition, if you also have that explosive seatbelt retractor it's also rated 2 ohms.