You will need to pop the stereo out of the dash to have a look to see if there is a connector for such a cable. Would have thought it was possible but not sure what Daihatsu used as a stereo maker for the newer shaped sirion.

Oh and by the way you have posted this in the '4x4' section and not 'cars' cue BobF and his Moderating powers to move you to the correct section before one of the 4X4 crowd come along to post a funny reply that they havent heard of this vehicle