2002 BMW 530 Dsc light

What method of code extraction was used to get this fault? Often times the generic extraction of faults for the DSC system can be incorrect and might lead you astray. I await your reply.

SNAP ON OBD2 scaner it said LWS open circuit to Can 91

This may require replacement of the DSC control module and for it to be coded to the vehicle. Before I can feel good about that recommendation I request you seek out a BMW technician with the BMW software (AKA a GT-1) to read out the faults and then repost to us. If the DSC control module does require replacement, it will require either the GT-1 or Autologic and someone who knows how to use it.