My blower motor is not working external resistor or no?

Hello and welcome to 2CarPros. Your vehicle does not use any type of resistor in the blower motor, it uses a Pulse Wave Modulation control signal from the AC amplifier module if this is an automatic system or the front air control if it is a manual control system to control fan speeds using an internal circuit inside the fan. To test if the problem is the controller or the blower motor you will need a simple test light. You should have three wires to the motor itself. A White which is battery voltage, a pink which is the PWM control signal and a black which is ground. To test it get a simple 12 volt test light. Connect the light to a good ground, now unplug the fan connector and with the key on and the fan on, check for a voltage at the pink wire. Turn the fan speed up and down and the light should get brighter and dimmer and if you turn the fan off it should go out. My guess is that it won't as the fan is always on high. If that is the case then the part to replace is either the AC amplifier module or the FAC module. The AC amplifier is located behind the control panel for the HVAC system. The FAC is the control panel on the manual control HVAC system. Here is the location is the diagrams below. They call the blower motor speed control the Auto AMP. Check out the diagrams (Below). Let us know what happens and please upload pictures or videos of the problem.

Hello,

It sounds like you have a blower motor that has gone out but to be sure here is a guide to help you see if the blower is the problem are the resistor.

https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only

Please run down this guide and report back.

Hello, I'm Danny.

I've attached a picture below of where the blower motor resistor mounts directly to the actual blower motor on the HVAC box under the dash. Be sure to check for a burnt/melted/corroded/loose type of connection. Hope this helps and thanks for using 2CarPros.

Hi,

It sounds like the ground is bad. I attached the entire wiring schematic below for a manual system. I had to cut the pic in two to make them readable, but I did overlap them so you can follow them.

In the second pic, I highlighted the three wires to the blower. Using a test light, see if there is power going to the white/blue and the blue/yellow wire. Make sure the test light has a good ground. If you find there is power, then confirm continuity to ground via the black wire in the harness.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

Since you can get the fan to run, it isn't a power issue, so I have a feeling it is a bad ground. If you want, run a jumper for the ground to a known good ground location

Let me know what you find or if you have other questions.

Take care and God Bless,

Joe

The most common reason for blower resistor failure is too much current draw from the blower motor. When this happens we always replace the blower and resistor together.

If you have a meter with an amp clamp, check the draw of the blower motor on high and see what the reading is.

Check it and report back to us with your results.

Roy

Sounds good.

You are welcome.

Roy

Hi,

Usually when a resister goes bad, you will still have high speed with the blower motor. However, anything is possible.

First, locate the junction box fuse panel in the vehicle. See pic 1.

Next, check fuses 10 and 11 as seen in pic 2.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

If the fuses are good, you need to confirm power the the resister. See pic 3. To do this, follow pic 4.

Here are a few links you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

If there is power, then you need to check if power is making its way through the resister and to the motor. Check the power wire going to the motor. If power doesn't exit the resister, replace the resister.

If there is no power to the resister and the fuses are good, recheck the relays.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

If the relays are good, then suspect the switch itself is bad which would require you to check for power to it.

If there is power to the resister and it makes it to the motor, replace the blower motor.

https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only

Here are directions specific to your vehicle. Keep in mind, access to the motor requires removal of the glove box.

Removal and Installation

REMOVAL
1. Remove the blower unit. Refer to "Removal and Installation"

2. Release the eight tabs attaching blower motor to blower unit case and then remove it.

INSTALLATION
Installation is in the reverse order of removal.

Check out the diagrams (Below). Please let us know what you find.

Good afternoon,

The most common issue is the amplifier in the circuit.

Do you have a voltmeter to do some testing?

Roy

With the key on, can you verify power to the blower motor on the connector? Back probe the motor and you should have battery voltage on both terminals.

https://www.2carpros.com/articles/how-to-check-wiring

Roy

Hi,

It could be the (Heater Fan Control Amplifier) check the heater blower motor fuses 10, 11, 12, and 19 their shown in the diagram below and check power at the blower motor. I'm attaching repair guides, component locations and wiring diagrams below for you to reference . Let us know if you need more information and what fixed the car.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

https://www.2carpros.com/articles/how-to-check-wiring

Thank you
Joe T.