mate your heater fan Resistor is blown, to achive each speed there is a resistor per setting to slow the fan down. so your 1 position resistor is blown, the resistor block comes in 1 peice with all three speed resistors on it, so just buy a new one from you r local honda dealer and put it in your self. you will find it screwed into the heater box behind the glove box, if your unsure, remove your glove box, take a photo, ill point it out to you.