I have a 2008 1.5 Ex that caem with the stock HU.
I got a new HU from a 1.6 model and tried to install it in my car. All the elctrics went haywire!
All the errors lighted up on the dash: airbags, ABS, servicing, and the aircon, speedo and tacho won't work too. I quickly went over to C&C but they were too busy to entertain me, although the advisor commented that the HU may not be compatible.
Since the car was working fine before the changeover, I took out the new HU again myself and everything went back to normal.
What could be the problem with the new HU? It was working fine in the 1.6.