Oh Yeah manuals
My Pioneer came with a CD containing PDFs for manuals. That might be good if the unit could read PDFs but it can't. It has a quick start guide that is easy to follow but I have had to print a few pages to figure things out.
Some of the factory radios (if you can call them that anymore) are very hard to use these days as well. I am not sure but with your Kenwood you might have to change a setting on your iProduct to get it to stop auto-play.
By the way Kenwood Excelon-KFCX1730P is a nice set of speakers not a headunit.
http://www.kenwoodusa.com/Car_Entertain ... KFC-X1730P
If you find the number of your headunit I will read up on how you might get it to stop doing that.
Also you might try calling Kenwood or a Kenwood dealer fro help using it. Sometimes they know all the little tricks. You might try the voice commands as sometimes they work really good.
Also headunits like Computers, Tablets, Phones iThingies and GPS units they all have (and need) updates all the time and many of them are free and can fix common problems. The last one I did for my Pioneer (was not free) fixed and updated a whole bunch of little things that made it much nicer to use. I took almost an hour to update though. The GPS has never worked so good.
In closing you should always whenever possible go to a store and touch and try a headunit out before buying. I am not saying you can't buy it on line I am just saying try to know what you are getting into before buying one.
Let me know if I can help in anyway...I love electronics and reshearch...
...Jamie