Just installed a after mark head unit, and if the colour connections are plugged into the head unit it keeps making the head unit flashing and a slight mute with calling and a picture of a phone the HU display. I take it something from the car is telling the HU theres a mobile phone call :confused:

Should I not be connecting the colour connection from and just the two that I've used a ISO adapter with?

The colour connection?

You need the two ISO and an aerial if you are just using a standard head unit without any phone kits etc. The iso adapter will require you to feed it a switched live from the fusebox etc also.

Ive fitted a iso adapter for the black and brown leads but there was also a three coloured one.