Yes it's the M57 its a 2005 3.0D facelift

All the fuses are good and the webasto works. it fires up when I unlock the car and I can feel it heating up.

anyone have a wiring diagram for the webasto so maybe I can trace the short to the internals of the webasto.

this is the error, it's in German for some reason my inpa is in english but all the fault codes are german.

Variant: IHKA39_5 1 Error in error memory
Error registration 1 : 0x001E: Zusatzwasserpumpe
Error accurances: 254
Kurzschluss gegen U-Batt
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Fehler momentan vorhanden
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<<<<!!!

Error code: 1E 41 FE 48 42 88 FF 49 04 03 8D