The front blower speed is controlled by a power transistor not a resistor. So if you didn't have power there, or you didn't have ground there, the next step, we're gonna test the resistor. To test blower motor, you need car battery and current meter that can go up to 20A. (The rear aux blower does still use a resistor pack). Be sure, when testing the resistor, to also check fuses, relays and voltage. Reconnect the negative cable to the battery. The motor can be seen hanging down close to the passenger kick panel. Testing: Part 1 how to test the er motor part 1 how to test the er motor part 1 how to test the er motor how to replace a er fan motor in. Disconnect the negative and positive power supply. Make sure you have power to the dark green wire from the relay to the motor (key on). It is my understanding that at the highest fan speed, there is 0 ohms resistance upstream of the blower motor. The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor. In this video you'll learn how to find, test, and if need be replace the blower resistor in a 2002 Dodge van. Just to the left of the blower motor, an electrical connector connected to a flat 1-inch-by-2-inch plate can be seen. Locate the HVAC blower motor resistor and test it to see if this is the issue. masuzi 4 years ago No Comments. This electrical component is used to control the air conditioning system of a vehicle. The blower motor resistor assembly, on your 3.9L Dodge Dakota, is tasked with reducing the current that the blower motor uses. The air conditioning and heating controls allow you to switch fan speeds — and the blower motor resistor controls that speed once you select it. If the resistor is bad you really need to consider the strong possibility that the resistor failed because of an aged and dragging blower motor. Using a multimeter set on the Ohm scale, use the positive lead and test the black wire. The blower motor is the component responsible for … With an ammeter you could test the current draw with the blower motor on the HIGH position. Log In Sign Up. The blower motor resistor adjusts the blower motor's speed. It takes some time to kill them, but with BM drawing >10A, you will get into a syndrome of replacing regulators and this occurs far too often. This is why at the bottom of the article we include a 2008 F150 blower motor wire diagram. Check for full airflow at the vents. Unplug the blower motor and see if there is voltage (fan on high should be the full 12 volts) If there is none, unplug the resistor and first look if any of the termanals are burnt/melted. If the motor is pulling a large amount of current (say 20 amps or more) then the motor is on the way out also. The first test, and probably the most popular way to test the blower motor resistor is by checking the continuity of the resistors that make up the resistor assembly. Part 1 How To Test The Er Motor … The blower motor resistor is an electrical component that is a part of the vehicle's heating and air conditioning system. How to test a heater blower motor resistor The heater a/c blower motor in my wife 2000 Acura TL seems to have failed. Your car doesn't have a resistor pack for the front blower motor it uses PWM (Pulse Width Modulation) to control motor speed. The blower motor resistor (or final stage) varies voltage to the blower motor to achieve the desired speed. How do I test if it’s the motor or the resistor before I buy the part? Basic instructions on how to troubleshoot the heater blower motor of a Saturn S-series. In order to test the operation of your blower motor resistor, you’ll be measuring the function by reading the internal resistance. The resistor is what controls the blower motor speed by restricting electricity through either the … It is responsible for controlling the blower motor’s fan speed. This tutorial will help you test the 2001-2004 Dodge Dakota and Durango blower motor resistor in a step-by-step way. The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. If they are then replace the plug and resistor. Standard® offers over 700 blower motor resistors as high-quality replacements that match the OE to ensure top performance. If you find that the fan in your car only works on high, you might well have a broken one. I called the dealer and he said there is a warranty on the resistor pack. This means that the current running through the blower motor, and thus is speed is controlled by the resistor value. But for them to honor the warrant they would have to check the resistor pack. Continue checking each resistor in the resistor box. The other is by bypassing the blower resistor with a jumper wire and thus indirectly testing the blower resistor assembly. The blower motor relay controls the current used to power the blower motor, and is subject to the constant on and off switching. The less current the blower motor uses, the slower it runs. Blower motor resistor has repeat failures. Reattach the harness on the box, then secure the box on the motor with the screws. Press question mark to learn the rest of the keyboard shortcuts. When the blower motor relay does begin to fail, the vehicle will usually display a few symptoms that alert the driver of a potential problem that should be serviced . A blower motor resistor is an adjustable resistor. The blower resistor is connected in series with the blower fan. How does the heater blower motor resistor work? Test the blower motor relay-if okay Apply direct power from the battery to the blower motor-don't come On-test the blower motor resistor-if okay the last stop will be the HVAC control module/blower … This can be a bad blower motor resistor or a failed speed switch. User account menu • How do I test a blower motor. If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. Testing your Chevy Cavalier Blower Motor Resistor. Each blower motor switch input terminal on the resistor must have continuity to the resistor output terminal, which is connected to the circuit going to the blower motor. How To Test Ac Blower Motor Resistor. What makes this reduction in current (and speed possible) is the three resistor coils that make up the blower resistor … This illustration shows a typical blower resistor, specifications, and test procedures vary between different manufacturers. Access to the relay & blower is from under the dash on the passenger side. 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