This is what they sent me ,
" Thank you for reaching out to us.
The ENA-3T3’s RCA outputs are somewhat compatible with JBL-equipped models when adding a powered subwoofer. We are currently tackling an issue where the aftermarket subwoofer's volume cannot be controlled by the factory radio's...
just finished installing their platform and I'm impressed ! Needed a few tweaks but that was expected with a brand new product .
Highly recommend one if your looking for one . !
The dealer replaced both the subwoofer speaker and the amp today . I now have sound coming from the speaker . Still not right . I get better low frequencies from the door speakers than the subwoofer . Dealer sent a ticket to Toyota .
I see an upgrade in my future .
If you look up the price of the head unit on the Toyota Parts website you will be amazed . $14,000+
For that amount of money , it should sound better than my Home Theater !