Here will be all the common problems with ICE such as headunits and their associated car model. Please check here before created a new thread If there are any other known common problems, PM me the problem and solution and i'll add them here

SONY HEADUNITS IN STILO:
The problem is that the Stilo has no switched live feed due to the on/off functions of the original factory head unit being controlled by the CAN system.

In their infinite wisdom FIAT have decided to put the live feed on the ISO block in a position which works with most aftermarket head units once you swap the inline bullets on the red and yellow wires round - I say most as this isn't the case with the Sony looms.

Having fitted a CDX-CA900 head unit in my Stilo (now in my Mondeo) I quickly found that no combination of the bullet connectors powered the unit up and resorted to swapping the position of the red and yellow wires in the ISO end of the Sony loom and then connecting both the male bullets to the double female. Also did this on Bo~Select@'s Stilo a couple of weeks back when he swapped to a Sony MP3 unit.

It's an easy job to do - just poke something long and thin (I used a 12v test probe) up the side of the two blades you want to swap (this releases the retaining tabs) and then remove them from the ISO block. Before pushing the blades into their new locations you will need to gently bend the retaining tabs back out so they do their job. Once the blades are swapped, connect the ISO bloks and you have a working Sony head unit.

The other option is to obtain an ISO extension (i.e. a straight through cable), cut the red and yellow cables and crimp Male/Female bullets inline to avoid altering the Sony loom - this way you can cross the cables if needed depending on the requirements of the head unit.

Thanks PurpleMonday for providing a solution

Installing Amp wire in Stilo 1.6

Ok this is how I ran the amp cable through the bulk head

First - Find the gromet - Its located on the passager side just under the windscreen, about 3 inches from the edge of the inner wing - In the pic bellow you can not see the gromet but you can see the black silicon used to cover the hole the cable went through - I could only poke the gromet out so I made sure no water could get in to the car by filling with black silicon, its in a very dry place but its good not to take chances.




Below is a wider pic - follow the red wire



You then need to take out the panel where the passager air bag switch is located - Pop the switch out,disconect it then remove the screw behind it.



Follow the panel round- open up the glove box and remove the two screws holding it, You should now be able to remove the panel.

Poke the end of your power wire in to the hole where the gromet was - Keep feeding it in and you should be able to see it through the removed Air bag switch panel you removed on the inside of the car.

I made a hook out of some wire and "hooked" the power cable, I then pulled it through.

You can now take up passanger door trim and feed the cable to the boot

Aftermarket HU in Punto mk2.5

As with the Stilo, there is a switched and continous power feed problem. What you need to do to get your aftermarket headunit to work is connect the red and yellow wires together (there is a connector on iso to do this).

Should you need help, im sure Gaz_Wrexham wouldnt mind helping.
Also thanks for pointing this out and finding a solution