hey guys i got a 99 gs300 with the premium audio. its not the mark levinson or the nakamichi, its just the lexus premium audio. well i installed a new head unit and no one around knows anythign about the wiring harnesses so that i can still use my factory speakers. anyone know how i can still use my factory amp with an aftermarket headunit? thanks

 

just get the wiring diagram and tap into the speaker wires from the harness which you unplugged the oem headunit from.
its really easy. the wiring diagram is always lurking around here. use the search and you will be happy.
good luck

 

Hey, I have the same stereo that he has and I can't find the wiring diagram either :/
Any suggestions besides searching because that got me here....

 

would this help:

https://www.clublexus.com/forums/gs-...r-diagram.html

 

bummer, If only this were for the Premium Sound System HU

Thanks Anyways