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I would replace the CIM in this case.
I have done many for GM Opel cars.
The new module needs to be programmed by an Opel/Vauxhall technician.
That is interesting.
I would say the black is not a ground, and it has possibly rubbed through to ground on the column or dash frame etc.
That length of wire end to end should be near enough zero ohms, but anything up to 1.5 ohms should be ok.
What have you got?
More importantly with both ends disconnected, there should be no continuity to ground, greater than 500k.
Do you have any circuit drawings?
I'm in Australia, our Vectra doesn't come out with a 1.9 DT, so ours could be different.
So that wire must be grounded within the harness or shorted to framework somewhere in the dash.
What year is your Vectra?
Ill see if I can find a circuit drawing.
What year is the Vectra, 1998, 2000 etc?
I don't have TIS access at the moment.
I can't find a circuit on the net either.
Would you like another tech to continue with you?
That F10 fuse is dedicated to the CIM, so the harness must have a short to ground.
I will opt out now to offer your question to others.
Glad you sorted it.
All the best to you.