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98 DeVille, 97 DeVille d'Elegance
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Does car have BOSE? If yes that is probably the RIM(radio interface module). Should have 2 connectors, 1 has double stack 12 pin the other double stack 16 pin. I think you had to have BOSE to have onstar, imay be wrong though.

If it has an antenna connection it is the cell phone module.
 
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