How do i turn off airbag light after disconnect and reconnect?

On old cars (pre 1998) you can usually reset the light by unattaching the battery ground terminal and waiting 30 seconds and reattaching it. On anything newer, there is a code exclusive to the make of the car and unfortunately a dealer will have to give it to you or send it to your ecm (ECU) for you. Even auto body shops have to ask for this information from a dealer!

Reference: R&D experience for a major auto maker and my personal car experience.