Good News! Thanks to Derf00 for the diagram link that actually showed the connector and wires. The two wires are a serial connection to the vehicle communication network. Not for adjusting speed as I thought but for reporting faults to the system that can be read at the Data Link Connector (DLC). Not connecting well not hurt but will most likely give a radio fault signal to the network.

 

Will this help?

 

No, it has the small square connector. No good for me. Thanks.