i know there is plenty of posts about this topic. but they dont seem to match up to my car. I've got a 2013 is350. with a non-ml sound system. the harness on my factory amp seems to be different from the previous years. I trying to tap into the factory amp harness and get the stock sub audio signal, remote turn on, 12volt constant and ground.
thanks in adavance. ill take my trunk apart again and take pictures of my factory amp and its harness as soon as i have free time.