you can get the equipment yourself reset it, you will the T4 model. or go to a specialist to get it done. 
if the light is staying on then it may be that one of the bulbs is blown. 
or a sensor has failed.
check all the wiring, most likely culprit is the seat side airbags, crimp all the connections tight and should sort it.
                
 squaddie
                
 August 2009