Can you Explain what these Color Wiring Does - Yaris 2011 - Headunit OEM Wiring

[Navigator17]

Hi Everyone , i need some help.
I was able to Install a Headunit in my Yaris 2011 - i think i screwed over some wiring connections , so here is what happens now

1 - I insert the key in and move to Accessory level of the key and Headunit powers up - NO AUDIO

2 - No Audio shows even when i move the key to Start position
3 - When i move the Key a little bit beyond the Start position where engine starts to make a bit of funny sound , the Speakers start sounding
4 - Funny thing is all this time Stereo is ON and i can access its screen and buttons so power is coming through
5 -Lastly when i switch off the car and move the Key back to Lock Position , Radio starts to sound and Speak wakes up , ONLY for a while and then Car is off

I must have messed up the Wiring , but i dont know what i did wrong , Please help -
Can you please elaborate what each of these Color wires in my attachment does and which part of it is where its possible gone wrong ?

[sh0rtlife]

tell me you didnt just hack off the OE plug.......idealy you want to pay the 7-12$ for a plug n play adaptor off amazon