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Don'y know the pin outs I'm afraid.It sounds like the supply for the TT is being fed by the "lights dim" wire ( the one that tells the displays to dim when lights are on) as it appears ok when lights are off.
You could try putting your multimeter on the connector to see which of the pins are "live" when the ignition is on.
Currently in SportTourer's garage:
2010 Laguna III SportTourer Initiale Tom Tom.