The last poster was incorrect that the fibre optic is for the steering wheel controls. It has nothing to do with them. (I know you don't have them, but still it was something incorrect.)That is good news. I do not use the phone and have no steering wheel controls, so this should be a no brainer.
Looking through other posts, am I correct that the amp is in the trunk, by the left lid hinge? Also, is there a fiber connection from the head unit to the amp? I think I am going to replace everything.