2000 Honda Civic Q&A
2000 Honda Civic Question: Blower Motor works on High Speed only
The blower motor relay is needed to supply power to the blower motor, the fuses #55 and #17 must be OK if you have high speed operation. You would need a wiring diagram and acess to the wires at the back of the heater control panel to check its operation, but if you have good fuse/power at fuse #17 and #47 there is a separate "power transistor" behind the glove box (on the heater box) 3 wire : blue/black 12v ignition key on, black is constant ground, light green/black is controlled by the heater controls. Check this as best you can but I hate replacing components with out using a factory wiring diagram and testing components to find a failed component. - patrick mannion
The power transistor controls the motor speed and it is shorted causing the blower to run high all the time. Desolder the power transistor and with diode check, check the base-emitter and base collector junctions. You will probably find a collector emitter short. - englewood1
is there a fan control module under the driver side dash? - danielsreseda
When i ground out my motor it only works on high speed regardless of the selector fan speed i know this is more than likley caused by the resistor and i know its in behind the glove box and when i ...