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Get your multimeter out ( if you have one). Although I think the Haynes manual only covers models up to pre facelift 2005 models.
Measure each wire in turn. The 5th wire may be an additional wire only used on later models like yours.
All lights off - one probe on end of each wire , then other probe in turn to see if all are 0 volts or any that are permantly 12v.
Then switch side lights on - see which wire becomes 12volts.
Then switch headlight dipped beam on, see which wire is 12v, then main beam. That way you should work out on your car what each wire colour is. Then its just a case of "swapping " the two wires around that control full/dipped!!! If that works you may not need to know what the 5th wire is for.
Failing that you would need to speak to your dealer for advice or an auto electrician. Stranger things have happened, but your dealer may give you some good free advice, you have nothing to lose by asking.
Currently in SportTourer's garage:
2010 Laguna III SportTourer Initiale Tom Tom.
Last edited by SportTourer; 5th September 2006 at 06:38 AM.