easiest thing to do is pullt he radio and check for the fiber optic connection ont he back. if it doesnt have the fiber connection, then your car wont have a fiber optic cable.

If it does, have you checked the compartment behind the passenger seat?

The cable if it is not fiber optic I believe will be like a 10 or 12 pin black connector

But I can;t be 100% sure.

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon - Sold
2006 E350 Wagon - 368 - Dead
2015 GL350 Bluetec - 197U