yes the car parking facility could be used by the society members only and no outsider can park their vehicle except guests of the member, if the space permits.
you need to write about this to the society office bearers i.e. secretary, chairman and ask them to issue circular about the same and issue letter to the said memebr also.
If the society doesnot take any action then you would be required to serve legal notice through an advocate and file a complaint gaainst the society office bearers and the said memebr also.
Advocate Rohit Dalmia