Audio System Question

Hi All,
I recently changed a 2002 Punto for a 2004 Punto. My query here concerns the (re)installation of my audio player.
I had a Sony CDX-MP30 in the 02 and expected a simple swap over using same
ISO harness in the 04 that I had in the 02. However, when I fitted the Sony into the 04 I got no response at all - no power to the unit.
Is there a different wiring config in the newest Puntos? And, if so, can anyone help me with reconfiguring the wiring? I know very little about car audio systems but I'm assuming (hoping) it would be a simple matter of changing the "slots" around on the harness.
My hope of simply matching up wire colours was a non-starter as the Punto's wiring has a completely different set of colours to the harness. Also, the 04 Punto has one wire extra compared to the harness - although I don't know/remember if this was the case on the 02 Punto.
Peter
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had the exact same thing at work on saturday, disconect the red wire on the sony wiring loom and plug it into the extra conector on the yellow wiring plug.
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Right! Thank You,
That did the trick. I'm rocking again! Well - OK, I admit that "rocking" is just me trying to sound young and trendy but it DOES work now.
Cheers, Peter
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