Stock FRS stereo on Toyota 86 - Wiring problem position lights turn on/off the stereo
 

Hi guys well basically I wanted to switch my stock stereo on my toyota 86 FT for the Scion FRS stock stereo. Problem is when I turn on the dashlights the stereo turns on and off. A friend of mine told me the wiring should be different and that I'm using the position lights circuitry to power on the stereo which is plain wrong.
any of you have the wiring schematic for the stock audio set on the FRS I mean the plugs with the colors, voltages and so on.
thanks.