Air Bag Light after Heater Core replaced

Just had the heater core replaced for the second time, now everything works fine expect the AIR BAG light came on afterabout 1 hour of having the car. It flashes slowly then fast then goes off for a second or two and then it stays on, now its on and has been on for a day. Any suggestion on what the tech could have missed? I hope he doesnt have to take the whole dash out again to fix the AIR BAG light?

Thanks

Saleen thanks for the suggestion. WHen i first got the car, the light was not on, after the whole day of getting it back and doing some errands, it finally started to flash and stayed on. If the passenger side airbag was not conencted shouldnt the light come on immediately upon starting the car when i got it back?