http://www.alldata.com/tsb/Toyota/11309184...008R-04/81.html The following procedure should be used to add an additional Smart Key (Immobilizer and Smart/Wireless functions) to the 2004 and 2005 model year Prius.
Ah, I see. Still, not much use to most of us who don't have our own THHT. Maybe just to give a 'heads up' to the tech to be sure to use the latest version of the TSB.
At the bottom it reads "NOT APPLICABLE TO WARRANTY". Does this mean that I must pay to have this serviced?
This is the instructions on how to add a new Key Fob (Smart Key) to your car. They give you two, but it can support up to four. Yes, it's on your dime. It's not a warrantee issue any more than putting new tires on the car would be. You have to pay for both the new Smartkey and installation labor.