That antenna wire has just about got to be for the phone. Do you have an antenna in the left rear fender?

I don't recall when the optical link was introduced, but the smaller 10-wire connector in the bottom of the second picture looks identical to the connector for the CD player in my '96 (both ends look like that). As for that DB25 and the other thing near it, I have no clue. Perhaps that is an optical cable.