Pioneer radio wiring problems !

Hey!
I just tried changing my old pioneer radio to my new car(the radio on it sucks). And i tried wiring it but for some reason i couldnt get it to turn on. The wirecolours are different from my previous car so im not 100 % sure im doing it right. I tried looking at the wiring diagram from internet but i couldnt find the exact same one i have on my car (VW polo -04 model). If someone knows how it should be done help would be appreciated! Took pics of the wires and so on.. Couple of the speaker wires arent on their places because i have separate back speakers so dont worry about it. Just need to get the radio to turn on and ill figure out the rest.
Thanks in advance!

The only way to tell for sure is to check the wires in the car harness with a multimeter

Yellow: Constant +12VDC (memory)
Red: key-switched +12VDC (accessory)
Black: Ground
Blue/white: amp remote or power antenna output

Speaker wires: The solid-color wire of each pair is positive; the black-striped wire is negative.

Left front: white
Right front: gray
Left rear: green
Right rear: viole

hope it can help you