43-year-old Kanimozhi appeared along with Kalaignar TV Managing Director Sharad Kumar, another accused in the case.
The third accused, Cineyug Films Director Karim Morani, who too had been summoned, however, sought exemption from appearance on medical grounds.
Kanimozhi was accompanied to court by several party leaders, including DMK MP T R Baalu.
Soon after the court proceedings began, senior advocate and former Union Law Minister Ram Jethmalani filed a bail plea on her behalf contending that she "has no role, whatsoever, in the scam."
He contended that apart from having a 20 per cent stake in Kalaignar TV, she does not have any role in running its day-to-day affairs.
She is neither a board member nor had attended any board meeting of the channel, said Jethmalani, adding that being a woman she deserves to be granted bail.
As Jethmalani argued for her, Kanimozhi looked calm and composed. The argument on her bail plea, besides proceedings relating to other accused, who appeared in the court were continuing.