The blower motor checks good but doesn't come on with the blower motor switch. All fuses are good. Switch or resistor?The ground on the resistor is good, motor works when grounding the white wire at the resistor. Other two wires show no hot or ground [ with test light] when turned on. 2004 Honda Accord.
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The actual fan switch for the blower and the whole control unit there could be a broken wire or the blend door actuator if everything else checks check what I have said in your answer
Well the blower motor gets power from a fuse, and the fan switch and resistor provides the ground for the motor.
So you could be checking the resistor wrong if you are looking for voltage at the resistor.
The resistor could show some voltage, but only what comes thru the blower motor.
I would check for ground at the motor with a test light or meter with the fan switch in various positions.
According to my wiring diagram, the blue and white wire from the blower motor gets power from the key switch. The fan switch and resistor grounds the motor. No blower fuse is listed.
SOUND LIKE BAD BLOWER MOTOR RESISTOR.CHECK BLOWER MOTOR HI BLOW FUSE AND RELAY.YOU WILL NEED OWNERS MANUAL IN GLOVE COMPARTMENT TO LOCATED BLOWER MOTOR FUSES AND RELAYS.
WELL YOU HAVE TO USE A VOLT METER CONNECT ONE VOLT METER WIRES TO GOOD GROUND AND THE OTHER VOLT METER WIRES GOES TO EACH SWITCH SPEED.IF VOLT METER GET VOLTAGE A 1 OR 2 CONTROL SPEED RESISTOR BAD.IF RESISTOR BAD YOU WILL GET 1 OR 2 BLOWER MOTOR SPEEDS.IF BLOWER MOTOR WORKING.CHECK THE AC AND HEATER CONTROL SWITCH FUSE OR CHECK BLOWER MOTOR FUSE AND RELAY.IF ALL GOOD SO FAR CONTROL SWITCH ITSELF COULD BE FAULTY.
here is how your system works. The mode switch provides power to the blower relay. With the relay on, 12 volts goes from the relay to the blower motor. The negative power comes thru the resistor and switch (except for Lo, which doesn't go thru the swtich), which also has a thermal fuse. If the 50 amp fuse in the engine compartment is good, the thermal fuse in the resistor is the most likely cause, though switch failure often causes the thermal switch to blow. You should use an ohmmeter to test the switch for multiple continuities. There is no power to the switch except what comes thru the motor and resistor. Please see my tip athttp://www.fixya.com/cars/r6234839-doesn_t_heater_or_air_conditioner_blow and let me know if you have questions.
the resitor operates ground, if theres no power then its a bad fuse under the hood in the power fusebox, or #10 fuse inside the leftside of dash, power for the blower comes from the ignition switch,double check all fuses,if you had no ground to blower then i would say the resistor,make sure you have a good ground on the test light, then check for power with key on again, heres a wiring diagram to help you, good luck.
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