Thanks all for your replies.
First I?d disconnected both battery plugs then I took out the air-bag and then the steering wheel because all the leather was warned out. I?d installed the new original steering wheel, and putted the old air-bag, but I forgot to reconnect it electrically and plugged the battery on again and started the engine and the SRS warning light stayed on. I realised that the air-bag was disconnected and plugged the cables on but the light keep staying on. So someone told me that I?d have reset the the SRS Air-bag system; or what else can I do?