I can't say for sure .. but technically your 01 should match the E46 info.

I am assuming you are aware that is a PWM driven fan . you can test is with INPA but it won't turn on just because you have power.
Other fanatics suggest you test each level inpa offers . Its difficult for me to swallow , but other fanatics say they've encounter a situation where fan level works, and another won't. So as mundane as it is, I suggest you test each level on the INPA test screen.

fuse map .. searchable with broswer "find"

 

PWM driven is correct. I’ve never used INPA, but I’m hoping it can help me narrow down what’s wrong.

As my air-conditioning works with the fan non-operational and I can’t figure out why it’s not turning on correctly, I may end up installing a switch in the cockpit to operate it. That or wiring in some type of temperature controlled sender.

 

You can't quite do that with just a switch. Such is the nature of pulse width modulation. See if it comes on with INPA. That is the key. If it comes on with INPA, then we know its not being triggered. If memory serves it is triggered based upon the temp sensor at the bottom of the radiator on the passenger side .. but resist the urge to do anything there until you test with inpa. You need to know if the fan works. For whatever its worth i just did the exact test with INPA. I have a few extra sensors so if you get to that point ask & I'll take a resistance reading for you, and you can test it.
Wither INPA or the hidden menu has the ability to display the temp of that sensor, which might be useful.

 

So, I’m working on my radiator fan and trying to figure out why it does not turn on, fuse number 37, the 50 amp fuse, is good.

The fan connector should be checked for 12v and GND at the connector, not just the F37. Even with 12v and GND, the fan still needs PWM signa -- small wire -- from DME to run.

Can I ASSume that since I have power at the radiator electrical connection, fuse number 101 is good?

How does F101 affect the fan circuit?

 

The fan connector should be checked for 12v and GND at the connector, not just the F37. Even with 12v and GND, the fan still needs PWM signa -- small wire -- from DME to run.

How does F101 affect the fan circuit?

I have 12 V at the fan connector, not just fuse 37 per my original post.

From what I’ve read, fuse 101 is part of the cooling system blower motor.

 

I believe I had the original fan when I pulled it out and installed a new OWM fan from FCP. From what I’ve read on my online searches and E46fanatics, there are no serviceable parts And it seems the control module is 95% of the problem.

 

there are no serviceable parts And it seems the control module is 95% of the problem.

Open the motor driver box and see if anything look obvious; maybe just need to replace some motor driver ICs which can be bought at Digikey.

 

I get it. But I still see a 3rd wire on there (the skinny one) and its likely that's a Pulse width Modulator wire (PWM) The common way to check that is with an oscilloscope .. but you can read it with a cheap analog voltmeter easily (it needs to be analog they have it at lowes .. about 15.00)
but i doubt you'll need it with INPA.

 

I don’t have an oscilloscope but I checked it with my multimeter and have continuity on the wire at the radiator fan connection and the DME panel. So that tells me the wire is good between the two…

 

They are potted with epoxy. That said, electrical work is not my forte and that’s is beyond my meager skill set.

After testing my old fan and the new fan with 12v applied directly to the motor only, I’m going to go out on a limb and say there’s something else going on.🤷🏽‍♂️