I have a 2002 honda civic ex. the heater a/c blower motor has stopped working. I have 12 volts at the plug in to the fan. I can apply 12 volts with a jumper wire off the battery and the fan runs great. plug it back in to the fan and all I get a bump turn when you turn the key on. again I have 12 volts at the plug in harness. I ran the self diagnostic and it gave me a code of 12, which is a bad blower motor. help please, thanks.....Ronnie

 

It's almost certainly the power transistor. You have a code 12, motor is good, and power reaches the motor. The power transistor controls the ground side of the circuit.

 

can you tell me where to find the transistor, is this a dealer part ?

 

I ment to say where is the part located on the honda ?

 

All is well !! it was the transistor or resistor which ever is your choice. runs great