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post #4 of (permalink) Old 9th November 2006
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It may also be to do with "safety". Not sure if Renault use the same methods, but Citroen do the same, if one of the bulbs blows, as a temporary measure it will use the filament from another lamp so at least you have some illumination, even if it is not the correct intensity. So if the brake ligh filament goes, it will use another filament from another bulb as a temporary light, until you replace the bulb. You get a "bulb" failure warning on the dash to inform you.
This, as far as I know is only possible with multiplex wiring, there is still some confusion as to whether the Laguna II ph1 models have this wiring fitted to all models.

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