May hap that some bright spark who knew how to (ha!) got the radio going enough to sell it to you. Like an emergency code maybe.

My car radio is so weired, the volume knob is embedded in the dash, the station buttons well below and the display part of the general controls/clock.

So weired, only another Yaris owner would want to steal it (and dis-assemble the whole dash). Luckily when I left the door badly closed and the light drained the battery (about 1 week) I found that fancy codes were totally unnecessary. Mind you the cheapo radio is a pain - no RDS. On long journeys I can never find a frequency that works before I need to find another. 6 presets is not enough.