To do this the easiest way, what you will require are two harnesses. You will firstly need the AMP bypass harness found here https://aerpro.com/app0260
Try match up the plug type into the back of your head unit by the pictures. One other thing that catches others out is that the Amplified antenna will now not have power as it has been bypassed too. Just tap the thin black wire that runs with the antenna cable with a white plug into ACC or if your unit has it, the power antenna wire.
Aftermarket Head Unit fitting into IS200 - 2005 model
in Lexus IS200 / Lexus IS300 / Toyota Altezza Club
Posted
To do this the easiest way, what you will require are two harnesses. You will firstly need the AMP bypass harness found here https://aerpro.com/app0260
Which will convert to the double ISO connectors. Then you will require a harness for the head unit side found here https://aerpro.com/products/secondary_harnesses
Try match up the plug type into the back of your head unit by the pictures. One other thing that catches others out is that the Amplified antenna will now not have power as it has been bypassed too. Just tap the thin black wire that runs with the antenna cable with a white plug into ACC or if your unit has it, the power antenna wire.