3 series airbag light problems

Question

 I recently added a new aftemarket amplifier to my audio system.I hook up 4 guage wire to the terminal close to the Battery distribution box it lookd like a very solid place to add a wire.Well after everything was hooked up and working correctly my airbag was on. I have used my Foxwell 510 OBD tool to try to reset light .It will not go off keeps showing driver side airbag fault