Davren
Thanks for the info, but... I don't have the Xenon option in mine, only the "normal" stuff. 
The iso which was created from the download doesn't have a version number but I do have the following information : Title "Fiat 500 Nuova.iso" Date: 5 May 2010, Size: 509.4 Mb.
I have tried looking at each model - 1.2 8v, 1.3 Multijet, 1.4 16v - they all appear the same. The 1.4 TB gives nothing: "The engine and production validities selected do not correspond to valid documents, Restart the navigation from: Electrical equipment"
If I try to search for Xenon I get no matches... 
Following your instructions
Electrical equipment > 1 ELECTRICAL FUNCTIONS > E20 EXTERIOR LIGHTING 
Gives me the following options:
E2010 SIDE LIGHTS / NO. PLATE LIGHTS  
E2011 DIPPED HEADLAMPS  
E2012 MAIN BEAM HEADLAMPS  
E2020 DIRECTION INDICATORS / HAZARD WARNING LIGHTS  
E2021 BRAKE LIGHTS  
E2022 REVERSING LIGHTS  
E2030 FOG LIGHTS  
E2031 REAR FOG LAMPS  
Similarly if I look for the Alignment system I get the following options:
E3010 HORNS  
E3020 WINDSCREEN WASH/WIPE  
E3021 REAR WINDOW WASH/WIPE  
E3030 DEFROSTING REARSCREEN AND REAR VIEW MIRRORS 
E3032 DOOR MIRROR ADJUSTMENT  
E3040 CENTRAL LOCKING  
E3050 ELECTRIC FRONT WINDOWS  
E3060 SUN ROOF  
E3070 CIGAR LIGHTER / CURRENT SOCKET  
E3080 HEADLAMP AGLINMENT CORRECTOR  
E3090 PARKING SENSOR  
The thing I really would find most useful is the pdf generate from this page:
Descriptions > 55 ELECTRICAL EQUIPMENT > 5540 EXTERIOR LIGHTING 
If it is easier to find in your version of eLEARN then I would really appreciate it if you could generate this.
Many (many) thanks