does the 05 scion tc have an amplified sound system?

[EpicRacer]

im trying to add a 2channel amp for my door speakers and the guy at the shop told me how to wire up the rca adapter and all but i get no sound from any of my speakers when i hooked it all up.

he said that if it is an amplified system, i will need to grab the signal directly from the rear speakers, not the HU

any advise will be helpful

[dontbelievethehype]

its not an amplified system, just a pioneer headunit hooked up to 4 speakers and 2 tweeters, i believe the 09 scion tc comes with a small subwoofer but not sure if the amp that powers that sub also powers the speakers