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Re: 2004 canyon no voltage at heater resistor
The resistor provides the ground circuit for the blower motor. So you would need to have power at the blower motor first. Grounding the motor or resistor should make the motor run.
The blower motor gets power from a 30amp fuse which gets power from a relay.
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I don't know much about Toyota's but, usually when the fan only works on high it's because the blower motor resistor is bad. When you have the fan on high it puts full battery voltage to the motor. When you have the switch set in any other position, the battery voltage is routed through the resistor. When that happens the voltage to motor is redeuced through a series of resistors giving you the different speeds. The resistor is usually in the duct work fairly close to the blower motor. Good Luck!
Check the blower resistor pack - usually located in the heater air ducting in the blower fan airflow. Check for loose connections and open circuit resistors on the unit.
If speed 4 works always, its unlikely to be the blower motor ground connection.
There is a fuse I would check first if you haven't tried that yet. They had problems with the switches in some of those vehicles. If you could take the control out and unpug then reattach the plug it may start working meaning the switch is bad.
You may have a bad fan motor. Do you have a test light to check for voltage at the motor itself?
Lastly, there is a resistor set that changes from low to high that may have one or more resistors burned out.
The Canyon has an inherint problem with the Fan Power cable being loose. When I say loose...I'm saying that you need to adjust the wires and then take a zip strip to tighten it up.
Passenger side under the dask are 2 cable hook ups. the one on the farthest right (Only 2 wires going to the plug) is the fan power cable. Jiggle it while the fan is on position number3 so you can hear when it comes on!!!