Help with merc condensation sensor

Hi I was wondering if you can help me out with a problem I need to fix on a friends lorry that he uses for charity
I need help identifying correct cable colours on loom for new socket for a condensation sensor in air system on a mercedes atego reg X931OAG
Dam mercedes won’t just tell me correct pins and insist I have to pay an extra £70 for a years acess to all merc tec info
I puchesed sensor off them and socket for loom
One is brown and other 2 are black one has a blue line on it and can’t remember last one clearly

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Brown is always ground and usually the feed is the wire carrying the tracer,black would therefore be signal.

I will try it thanks hope I don’t damage new sensor if I get it wrong

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Can anyone please take a phot of connector on harness side on any merc as still don’t know pin configuration and will be A better starting point

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