Asus Strix GTX 1060 GPU controlled Fan Headers Not Working.

Hello Everyone I have this Asus Strix GPU it has Two 4 Pin fan controller in it i have Plugged my 2 3-Pin PWM fan in it I dont know how it works....
When power on the system the fan just spins and then just stops
i have turn on the fan speed to 100% too but then the GPU fan are working at 100% but still the connected fans are not operational?

How it works?