You're both making me feel like a spring chicken
The fan controller is on the right hand side of the car. Behind the glovebox in LHD I think, drivers side in RHD. I have seen a couple of times now where the translation in WIS is language only, not always LHD / RHD as well.
The connector to allow testing of the voltage from the ACC is visible when you remove the glovebox. The cable for the controller side then goes up through the scuttle into the void behind the bulkhead, around the fan housing and motor, and then down back through the scuttle into the drivers footwell. The cable is nearly a metre long.
I have checked my phone and I have no more photos to upload, sorry. If you have WIS then use the "location" button to find item 220. You can see from the diagram that the electrical connector is on the LHS from the view.
The offer is still there if you want to test the voltages after removing the glovebox, which is fairly straightforward. But if you aren't comfortable with that or don't have a meter then it's time to get someone else to do the job. If you do, get a fixed price quote for it.