Axxess TYTO-01

is this the correct package to retain the factory powered subwoofer while replacing the factory headunit?

 

http://axxessinterfaces.com/index.php?main_page=product_info&products_id=71

"The TYTO-01 interface is designed to allow the user to replace the OEM radio with an aftermarket unit in select 2003-up Toyota vehicles and retain the use of the JBL and JBL Synthesis amplified audio systems."

 

I learned my Tacoma doesn't have the JBL system, only the factory subwoofer, so the

$70 TYTO-01 JBL Amplifier Interface Harness, BLACK

TYTO-01 harness doesn't match up with the factory harness. Crutchfield and Sonic Electronix can't seem to help. Any advice anyone?