Internal Heater/Cooler Blower not working

I recently had the ECU repaired because the car wouldn't start, which fixed that problem but when it came back the Heater/Cooler Blower didn't work. I have checked the resistor pack and it provides the correct readings i.e. short for fastest setting and then increased by approximately 1.2ohms for other settings in turn. The plugs and wiring look ok. I tried to check for voltage to the fan motor but couldn't find any, although I did not know which pins related to what (4 thinner wire connectors and one thicker). Therefore I am assuming the problem is related to the ECU, could someon advise on whether the ECU does control this function.