air bag :(

hi guys any airbag proffs out there? my story.... i brought a hyundai coupe f2 evo ( made in 2000)a few weeks ago,it is a cat c write off major front ender! i have done all the panel work but the air bag warning light is giving me grief! i have replaced the bag and cable to the rear of the bag, the sensor middle under hand brake! my a/bag warning light flashes 5 times then stays on, just as if the bag wasnt connected( i have tried he bag on another car it is fine!) i have tried hyundai and all i get is it must be the seat belt pretensioner! i have stripped my motor there are no seat belt pretensioners on the buckle or the belt its self! i have now stripped the entire wiring(yellow cover) from the sensor to he air bag looking for overheating etc no signs are there more sensors any ideas