That's another function in the RDS - Program Type (PTY IIRC)

LOL! Thanks for the explanation, the salesman said it was a "party line" setting and showed me how it worked. The button it labelled PTY. The man did not know a damn thing about diesel trucks, either. On delivery he was able to go over what the average vehicle driver needs to know. AC, radio, etc. Couldn't even tell me about the break-in schedule for a diesel... I'm dying to get the customer satisfaction survey from DC...