MK4 radio wiring diagram??

**dubster99** · 30-09-2012, 07:45 PM

I'm trying to install a pioneer headunit (DEH-P5150UB) and I have the plug for the for it with all the wires needed but with the factory plug it is ONE plug with 15 wires. obviously 8 wires are the speaker wires but can't seem to find a wiring diagram to explain what the coloured wires are and if I need them all? Any help would be awesome!

Cheers Anthony

**dylan8** · 30-09-2012, 08:37 PM

I have one somewhere, Ill try find it.
I did just find it on the net somewhere, so im sure itll still be there also

**dubster99** · 30-09-2012, 08:45 PM

cheers dude, theres 7 wires that I'll struggle with. i think ill need just the power, the ground and arial :/

Originally Posted by dylan8

I have one somewhere, Ill try find it.
I did just find it on the net somewhere, so im sure itll still be there also

**VR6man** · 30-09-2012, 08:52 PM

http://www.go-tech.com.au/downloads/...m%20Update.pdf

First column

**kapowww** · 30-09-2012, 08:55 PM

Originally Posted by dubster99

cheers dude, theres 7 wires that I'll struggle with. i think ill need just the power, the ground and arial :/

And the accessory.. There would also be one for illumination.

**dubster99** · 30-09-2012, 09:44 PM

the wiring adapter I have is from my old falcon to suit the pioneer. the wires it has are

My harness > Car wires
-Blue/White Antenna -- (connect to antenna booster)?
-Yellow 12V+ Battery/con ANT -- (connect to Pink Battery)?
-Red 12v+ ignition switched -- (connect to Red Accessory)?
-Black Chassis ground 12v- -- (ground Black)

and obviously 8 speaker wires.

so the Grey ANT output 12v+ ??
and Orange Dimmer In 12v+ ??

**djorkboy** · 01-10-2012, 08:53 AM

The problem with the MKIV when it originally came with a Eurovox head unit is it already has an adapter. Pull it up a bit and you should find the original 2 piece VW audio harness connected to a Eurovox adapter. Removing the Eurovox adapter should make it much easier to use a standard VW>Pioneer adapter like this one.

**dubster99** · 01-10-2012, 10:15 AM

Yea but I dont want to go and buy another harnes, waste of $20 just need to know what to do with the other two wires?

**Back Door Shenanigans.** · 01-10-2012, 12:02 PM

I know you said you don't want to waste $20 for another harness but its the best way to do it and whats $20 in the end? Thats the way i did it and if i ever want to go back to stock its just yoink the cables. I beileve the car side is called iso aswell if you wanted to know.

Originally Posted by djorkboy

The problem with the MKIV when it originally came with a Eurovox head unit is it already has an adapter. Pull it up a bit and you should find the original 2 piece VW audio harness connected to a Eurovox adapter. Removing the Eurovox adapter should make it much easier to use a standard VW>Pioneer adapter like this one.