Easily add a bass amplifier to any non-Amplified (non-JBL, Non-Harmon Kardon, Non-Pioneer) Toyota / Scion / Subaru vehicle from 1987 and up (see list below).   Includes a basic 2 channel line out converter (Pac SNI-35) for RCA signal output and a remote turn-on wire for any amplifier (mostly bass amplifiers).
 
If you are installing a multi-channel amplifier, please order the multi channel version of this harness here which includes speaker wire input / ouput, remote turn on wire, etc.
https://www.provobeast.com/product-page/toyota-amplifier-t-harness-wire-kit-for-factory-oem-head-unit
 
For a higher quality line out converter (Pac LP3-2), please select that option when ordering.
 
THESE ARE ALL NON-AMPLIFIED TRIM LEVEL VEHICELS.  This harness is for 2 channels ONLY.
 
Compatibility guide:
Scion:
2013-2016 SCION FRS
2012-2015 SCION IQ
2005-2016 SCION TC
2004-2006 SCION XA
2004-2015 SCION XB
2008-2014 SCION XD
 
Subaru:
2013-2020 SUBARU BRZ
2016-2020 SUBARU CROSSTREK
2016-2020 SUBARU FORESTER
2015-2018 SUBARU IMPREZA
2015-2017 SUBARU LEGACY
2015-2017 SUBARU OUTBACK
2016-2021 SUBARU WRX
 
Toyota:
1987-2019 TOYOTA 4RUNNER
1995-2018 TOYOTA AVALON
2018-2019 TOYOTA C-HR
1987-2017 TOYOTA CAMRY
1986-2006 TOYOTA CELICA
1987-2019 TOYOTA COROLLA
2000-2006 TOYOTA ECHO
2007-2014 TOYOTA FJ CRUISER
2001-2019 TOYOTA HIGHLANDER
1987-2002 TOYOTA LAND CRUISER
2005-2013 TOYOTA MATRIX
1985-2006 TOYOTA MR2
2001-2021 TOYOTA PRIUS
1996-2018 TOYOTA RAV4
2001-2018 TOYOTA SEQUOIA
1998-2017 TOYOTA SIENNA
1999-2009 TOYOTA SOLARA
1986-1998 TOYOTA SUPRA
1995-2019 TOYOTA TACOMA
2000-2019 TOYOTA TUNDRA
2009-2015 TOYOT AVENZA
2007-2017 TOYOTA YARIS