Perhaps Prius ownership should be designated BK and SK, in the same manner years used to be designated BC and AD. BK is for all Gen II Prius models with black key fobs. SK is for those Prius models equipped with Smart Key System (SKS) functions. BK owners take heart: eBay and the Internet have made DIY fob replacement a reality. It’s a two-step process: one sequence to turn on the Prius; a second to operate the doors.
Starting the Prius
Step 1: Insert the current fob into the dashboard slot, then remove it. Repeat this sequence three more times for a total of four “in/out” sequences. Insert the fob a fifth time and leave it inserted.