I found the answer. After a three hour stay at the dealer, with no result, I came home and did a search. "How do I connect my iPhone to my car text messages?" And it was as simple as a switch. Here's the result:
"Turn on the vehicle and allow your iPhone to connect. Then tap Bluetooth in the iPhone's Settings App. Select, SYNC , then tap Show Notifications (the "switch") on the following screen." There was a blue circle exclamation point to get me to the next screen, instead of SYNC. Simple.
Now I can use Voice Command to send from a set of standard text messages that appear on my car's screen or are played through Voice Command, and my previous messages are now in a list, which can be played back only by Voice Command.