Looking at the manual for CTSAD002.2, yes, the blue wire on the harness needs to be connected to the blue wire from HU and Radio aerial: http://www.connects2downloads.co.uk/c2/files/InstallationGuides/CTSAD002.2.pdf This will allow the speaker amp to power up.
The other wires are as follows:
Pink - speed pulse (probalby for use by Gala? or whatever, which adjusts HU volume as you speed up ot allow for road noise)
Green - park brake (no need to do anything with this one - we already 'fixed' that )
Purple - reverse (used to switch to reverse camera if installed, I guess)
The other wires are as follows:
Pink - speed pulse (probalby for use by Gala? or whatever, which adjusts HU volume as you speed up ot allow for road noise)
Green - park brake (no need to do anything with this one - we already 'fixed' that )
Purple - reverse (used to switch to reverse camera if installed, I guess)