Pioneer radio wiring problems !

[OlarinHaukka]

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!

[PaulD]

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

[shahbaz]

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