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Have you tried replacing the fan relay? Most of the time they use a lot of the same relays for different things. You could try swapping the fan relay with one that you know is good, i.e. on a system that you know is working. If that fan works then whatever you removed the other relay from doesn't, you know its bad.
You are right. Looking at the assembly everything comes on it. It could be a possibility of a new bad assembly, but I don't have access to volvo stuff to help you diagnose the electric issues here. I am going to opt out, and someone else will be by to help you. No need to post a response, it will just lock me back into the question.
Hello there are a few checks that you can do. 1. Check the fuse for the cooling fan and make sure that the old fan did not blow the fuse. 2 You can check the power and ground at the fan to make sure you have a good power and ground. The other wiring goes to the control unit to control the speed so make sure to stay away from the small wiring. I have a feeling the fuse may be your issue.
I am going to open this question up, this is going to need a more in depth solution as you have checked all the basics, I am going to opt out, you do not need to reply this will lock the question back to me.
The signal that your losing is coming from the ECM. Since you replaced the cooling fan module already I would replace the ECM. Let me know if you have any questions. Thanks.