Before you spend your hard-earned cash on any parts, here's what you need to do (ignition off).
1. Get a 3' length of automotive wire and connect a small crocodile clip on each end.
2. Locate the wire going to pin 14 of the CCRM and make a small break in the insulation to expose the wire underneath.
3. Connect one crocodile clip from your test wire to it.
4. Touch the other crocodile clip of your test wire on the positive battery terminal (12v).
If the low speed fan doesn't come on, it's likely that the relay inside the CCRM is blown. To confirm that, try hotwiring the fan. If the fan does come on when you do that, you'll know that the CCRM is the problem. If it doesn't, the problem will be inside the fan motor.