Scoobyfirsttime

I have just fitted a Pioneer amp (GMX602) and speakers in my scoob and am struggling to find where the system control wire should go in the headunit - I know this set-up works because it came out my old car (both the HU and amp), its just been about two years since I used any of it (and I didn't fit it myself last time.....

Any ideas?

Speech

What's the head unit you are using??

Usually the system remote from the h/u is a blue or blue & white wire - or at least it is on the 3 pioneers I have dealt with recently!