It is either high or low resistance/ poor contact in an SIR deployment loop. Each circuit of the airbag system sees a certain amount of measured resistance in them. Once a value exceeds or fails to meet this value it will set the light. Since it is not on steady I'm guessing one of the above conditions. You can take it in whilst the light is either on or off, because the DTC will not dissapear until 100 consecutive failure free ignition cycles, which rarely happens.
This does not require immediate attention, as the airbag will still attempt deployment should a crash occur. You should get it in at earliest convenience though. My money is on either pretensioner deployment loop or side airbags.
My turbo lag is your courtesy head start.