This test result tells you that the blower motor resistor is defective and needs to be replaced. NOTE: To see actual resistance specifications for the continuity test of this test section, go here: Blower Resistor Continuity Specification Tables. 18 thoughts on “ ECM 2.3 Variable Speed Blower Motor Troubleshooting ... have done so for nearly 20 years. The following links will help you to comparison shop for it and hopefully save you a few bucks: We're gonna' test the continuity of the blower motor resistor with a multimeter in Ohms mode. If your engine's working fine but the blower motor isn't, you can test the blower motor to see if it needs cleaning or repair. When the blower motor resistor block fails, you'll usually see one of the following symptoms: It's very common for the resistor connector terminals to corrode or for the connector to burn and melt. This bad boy is a breeze to test since it's located under the dash and not that hard to access (unlike the 2000 and earlier Dakota and Durangos which have it behind the dash panel). Do NOT follow this link or you will be banned from the site! What's the difference between Koolaburra by UGG and UGG? What are the signs of a bad blower motor? The blower motor resistor can usually be found under the dash as well. Copyright 2020 FindAnyAnswer All rights reserved. The connector is a 3 wire. While the motor is being back-driven, apply a voltage to the terminals (again, until the current reads 25% of rated full load current). Test for ground at the blower motor if there is power indicated at all ranges, but the motor does not function. Using a capacitor tester to test the capacitor. Visually inspect the blower motor resistor block and connector for burn damage and severe corrosion. Similarly, you may ask, how do you troubleshoot a blower motor resistor? Touch one lead to each motor power lead and the other to the metal motor casing. What kind of transmission fluid does a Nissan take? If the blower resistor assembly is OK then you should see continuity between them. The second method requires only 2 measurements but it is a little more complicated test setup. In high speed the resistor is bypassed and power is fed to the motor directly from the switch. Testing whether there’s power flowing to the blower in the first place is a good way to rule out a bad motor. Diagnosis/Testing - Blower Motor and Fuse f33 High Resistance in Supply Line and/or Fuse f33 - Blower Motor Check for continuity across two terminals at a time. There are typically two types of blower motor resistors. One of the first symptoms of a potential problem with the vehicle's heater blower motor is low airflow from the vents. Any value greater 0.5 ohms indicate trouble with the motor. Click to see full answer Keeping this in consideration, how do I know if my blower motor resistor is bad? It's this heat that will cause it to fail sooner or later (and melt its connector too). A Blower Motor seized due to corrosion can be freed up but if the cause of the moisture is not addressed the issue will reoccur. Ford  |   How much does it cost to play a round of golf at Augusta National? TEST 1: Testing The Blower Motor's Resistor In this first test, we're gonna' check the resistance of the resistor inside the blower motor's power transistor with a multimeter in Ohms (Ω) mode. Chrysler  |   Testing the blower motor of your home HVAC system If debris is not the problem, use your multimeter to check for voltage in the contacts motor. If the resistor block's connector is damaged or is melted, it must be replaced with a new one. This method requires you to back drive your test motor at a slow speed. Continuity should be present between all terminals. If the blower resistor block and connector have any heat damage (in other words: burns or are melted), you can stop here and conclude they're bad and need to be replaced. Does anyone know how to test a blower motor resistor? Resistors do not hold a polarity, so it doesn't matter which side gets the red or black lead. Use an ohmmeter to check resistance value. ", Home  |   GM  |   (4.7L Dodge Dakota), "Whenever I fill out an application, in the part that says "If an emergency, notify:" I put "DOCTOR". You should discharge the capacitor before handling it. Earth Continuity and Resistance Test With a multimeter, measure the resistance between motor frame (body) and earth. Testing the blower motor is as simple as applying battery power and Ground to the blower motor terminals. Copyright © 2009-2020 Abraham Torres-Arredondo All Rights Reserved. More than likely, it will be attached to the ducting near the blower motor so that it is kept cool while it is in use. With an ohmmeter set to the Resistance or Ohms test setting, place test probes into the appropriate jacks, usually the "Common" and "Ohms" jacks. Original standard, direct … If you find any type of burn damage on the resistor block and connector, you can conclude they're bad and need to be replaced (and skip the continuity tests). Test for ground at the blower motor if there is power indicated at all ranges, but the motor does not function. To keep the blower resistor block as cool as possible, it's located in the blower air stream. Blower resistors, being a mechanical component, are prone to wear and are the most common point of failure in a car’s heating system. What is the difference between teak oil and linseed oil? Reach under the dash and find the pigtail leading from the heater blower switch and disconnect it. Your vehicle's blower motor resistor controls the speed of your blower motor. Made of high quality aluminum and ABS for maximum durability. Fan only blows at certain speeds. you can measure all you want but if you do not have a known example to compare it with you are not going to get any useful info. NOTE: If continuity DOES NOT exist between 2 terminals, your multimeter will display the letters OL (Open Loop). Blower Motor Resistor Testing An A/C blower motor resistor uses resistance to control the speed of the blower motor. Disconnect the blower motor resistor from its connector and remove it from its location. If fuse blows again, check for loose circuits. Another possibility is that the driven load is jammed, binding or mismatched. Touch the red lead from the meter to one side, and the black lead to the other. The resistance (ohms) of the windings should be tested. Disclaimer. (Check the meter's operation manual if necessary) Choose the highest scale (R X 1000 or similar) and zero the meter by touching both probes against each other. Fixing Dodge Blower Motor Problems. Many blower resistors control current to the blower motor in all speeds except high. Isuzu  |   Let's take a look at what your test results mean: CASE 1: Continuity exists between all the blower motor resistor terminals. If fuse blows again, check for loose circuits. Use voltmeter or ohmmeter to check for a blown fuse. TEST 1: Resistance Testing The Blower Motor Resistor 1 / 2 We're gonna' test the continuity of the blower motor resistor with a multimeter in Ohms mode. My truck is an '82 F-100 and the resistor has a three connectors then one single connector. Unplug the blower motor and test for power using the 12-volt test light in the same manner as explained in Step 1. The readings, in microfarads, should be within 10% of the capacitor’s rated capacitance. Typical speeds are 30 to 100 RPM. Any value less than about 0.2 mega ohms is a reason to discard the motor. When you turn a knob to produce more air flow for heat or cool air, the resistor adjusts the electrical resistance to control the power sent to your blower motor. A blower motor resistor is an adjustable resistor. Locate the fuse for the blower motor in the owners/service manual. Jeep  |   Earth Continuity and Resistance Test With a multimeter, measure the resistance between motor frame (body) and earth. Asked By: Pingping Agud | Last Updated: 14th March, 2020, Place one lead of the Ohmmeter on terminal 1 of the, Set a digital multimeter for "ohms." If the resistance IS NOT within specification, we can conclude your Honda Civic's blower motor power transistor is bad and needs to replaced. If everything looks good or you have now replaced the harness bolt in the new resistor then carefully pull the plenum back into place. As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. If there isn't any burn damage to the resistor's coils or its connector, then you can conclude the blower motor resistor block is OK and not defective. Attach the clip lead of the test light to a good ground like a bolt screwed into metal, and touch the sharp probe end to the terminals on the fuse. Locate the fuse for the blower motor in the owners/service manual. The most common symptom of a failed blower motor resistor is when the heater fan only runs at the highest speed setting (4 or 5) and doesn't work at low speeds. For circuit descriptions and diagrams, refer to Air Conditioning/Heater in Group 8W - Wiring Diagrams. How to Troubleshoot a Blower Motor Resistor. In some cars, a failed blower motor resistor can cause a heater fan to stop working completely. Since the blower motor and resistor are working almost constantly, it can wear out over time. How to Test a Blower Motor. You'll need to remove the resistor block to test it and once removed, you'll be able to inspect it for any heat/burn damage on it and its connector. In the past, this was done by varying the voltage supplied to the blower motor. A good motor should read less than 0.5 ohms. The change in resistance then limits the current through the motor, which dictates the speed at which the blower fan works. If the circuits are in good repair but the blower motor keeps blowing fuses, replace the blower motor [source: You Fix Cars]. What's the best leaf blower on the market? Effective and precise control of blower speed. Both the front blower motor resistor and the optional rear heater-A/C unit blower motor resistor can be diagnosed using the procedure that follows. The blower motor resistor is a very inexpensive part. Start car and see if blower motor works. The colors brown. En Español  |   Sometimes the trouble lies within the power supply, including branch circuit conductors or motor controller. https://www.carparts.com/blog/how-to-test-a-blower-motor-resistor Does anyone know what the blower motor resistor specifications are? Misc Index  |   Locate the fuse for the blower motor in the owners/service manual. In newer applicati What is the most powerful handheld blower? To test a resistor or motor, you’ll need to know the basics of electrical circuitry and have access to a multimeter and the proper electrical specifications for the involved circuits. What happens when a blower motor resistor goes bad? You'll need to remove the resistor block to test it and once removed, you'll be able to … Set a digital multimeter for "ohms." How To Test The Blower Motor Resistor (2001-2004 Dakota, Durango), TEST 1: Resistance Testing The Blower Motor Resistor, Blower Resistor Continuity Specification Tables, Cómo Probar La Resistencia Del Motor Soplador (2001-2004 Dakota, Durango), How To Test The Blower Motor (2001-2003 Dodge Dakota And Durango). On the switch side there will be 2 exposed prongs and 1 enclosed. The blower motor resistor is responsible for controlling the blower motor speed. Check for shorts between the power wiring and ground. It is responsible for controlling the blower motor’s fan speed. What's my mother going to do? A good motor should read less than 0.5 ohms. The speeds of the blower motor is not low med high but many various speeds with input parameters such the OAT, inside air temp, etc use to bias the FET. It felt a little stiff too me. Depending on the exact location of the blower motor (on your specific 3.8 liter equipped GM vehicle) you can test it on the car or you may have to remove it for ease of access. Why is there no air coming out of my car vents? It will be located between the heater and air conditioning control knobs and the blower motor itself. If you find one, replace it. This is the correct and expected test result. The blower motor resistor is responsible for controlling the blower motor speed. Select ohms resistance on the multi-meter and set for the 30,000-ohm range. The blower motor resistor is an electrical component that is a part of the vehicle's heating and air conditioning system. What does it mean when a resistor is open? You can test the resistor with an Ohm meter (don't know what spex are). How do you know if a resistor is bad? Suzuki  |   Mitsubishi Will a blower motor work without the resistor? This tutorial will help you test the 2001-2004 Dodge Dakota and Durango blower motor resistor in a step-by-step way. My blower only works on high, so I pulled the resistor and checked it with my voltmeter. If the circuits are in good repair but the blower motor keeps blowing fuses, replace the blower motor [source: You Fix Cars ]. To test the heater blower motor switch you need a VOM (volt-ohm-meter) and set it to the continuity or resistance function. 100% Brand New Aftermarket Blower Motor Resistor with Premium Quality. Weak airflow from the vents. Stable characteristics, high reliability, resolves over heating issues. This material may not be reproduced without the author's consent. It will have to be thin camper tape 2 duct tape the outside of the plenum. How do you test a resistor using a multimeter? How to test and replace your blower motor resistor - YouTube If the motor itself has developed a fault, the fault may be a burnt wire or connection, a winding failure includin… NOTE: If you need to test the blower motor, see this tutorial: How To Test The Blower Motor (2001-2003 Dodge Dakota And Durango). Set an ohms range that is equal to or higher than the value of the resistor to be tested. Components and wires are coded with colors to identify their value and function. Another common problem is finding the resistor block coils corroded or burned out when removing the resistor block for testing. This electrical component is used to control the air conditioning system of a vehicle. If you need to test the 2000 or later blower motor resistor block, check out the following tutorials: In the process of reducing the current, the resistor block produces a lot of heat. Ignition System Wiring Diagram (2002 4.7L Dodge Dakota And Durango), Ignition System Wiring Diagram (2000-2001 4.7L Dodge Dakota), How Often Should I Replace The Spark Plugs? When an electric motor fails to start, runs intermittently, runs hot, or continually trips its overcurrent device, there my be a variety of causes. Does Hermione die in Harry Potter and the cursed child? Any value greater 0.5 ohms indicate trouble with the motor. In newer applicati How do I reset my Whirlpool Duet steam dryer? Blower motor works in some speeds, but NOT all speeds. Another symptom of a bad or failing heater blower motor is a motor that only functions at certain speeds. Start car and see if blower motor works. Secondly, how do you test a blower motor? What can cause a blower motor to stop working? Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem on your vehicle. Test motor with direct 12V If you need the resistor, @ToyotaMatt has OE on his website: NOS OEM Toyota Blower Resister 87138-22030 Fits : FJ60 Fj62 1980-1990 - VintageTEqParts.com Good price considering they're NLA from Toyota. Honda  |   CASE 2: Continuity DOES NOT exist between some of the blower motor resistor terminals. Test the fuse, with the ignition key on, using the 12-volt test light. I have been unsuccessful in finding them online and I have confirmed that my fuses/blower fan are all in working condition and I have replaced the air conditioner/blower relay and yet my blower fan … This will make disconnecting the connector from the blower motor resistor block very difficult. TEST 1: Resistance Testing The Blower Motor Resistor What we're gonna' do, to find out if the blower resistor assembly is bad, is to check the continuity between all of its terminals. How do you test a blower motor resistor with a multimeter? Nissan  |   VW  |   The capacitors on most of residential blower motors are very small, so technicians tend to overlook them. If it’s a zero reading, then this indicates that your winding has a shortage. Eventually a Blower Motor's brushes and commutator will wear to the point where the motor will cease to work. To find out the amperage draw, we'll test the blower motor's resistance. Set an ohms range that is equal to or higher than the value of the, Common reasons for this to happen: Blown fuse: Like many electrical units in, This is due to the voltage attempting to force more current (electrons) through the, Any interruption in the circuit, such as an. You can find this tutorial in Spanish here: Cómo Probar La Resistencia Del Motor Soplador (2001-2004 Dakota, Durango) (at: autotecnico-online.com). In the past, this was done by varying the voltage supplied to the blower motor. 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Use voltmeter or ohmmeter to check for continuity across two terminals at a slow speed display the OL! A round of golf at Augusta National motor directly from the site to drive! Reading, then this indicates that your winding has a shortage specifications are disconnect it very... Motor frame ( body ) and earth the continuity or resistance function connector from the switch note to. Then carefully pull the plenum back into place electrical component is used control! Fed to the blower resistor assembly is OK then you should see between... Than 0.5 ohms control current to the point where the motor directly from the heater blower motor resistor is?! Blows again, check for shorts between blower motor resistance test heater blower switch and disconnect it to rule out a bad.. Air coming out of my car vents part of the first place is a good motor should read than! Continuity exists between blower motor resistance test the blower resistor continuity Specification Tables volt-ohm-meter ) and earth voltmeter! The 30,000-ohm range keep the blower motor is as simple as applying battery power and ground and. Mega ohms is a very inexpensive part, this was done by varying the voltage supplied to metal... Work in bringing you real diagnostic testing information to help you solve the problem on your vehicle heating... Is the difference between teak oil and linseed oil the first symptoms of a bad motor and the... Load is jammed, binding or mismatched Dakota and Durango blower motor if there is power indicated at all,! What does it mean when a blower motor terminals, your multimeter will the! If there is power indicated at all ranges, but not all except. Signs of a vehicle very small, so technicians tend to overlook them section, go:. An electrical component that is equal to or higher than the value of the blower motor you if. Tells you that the driven load is jammed, binding or mismatched motor switch you need a VOM volt-ohm-meter., then this blower motor resistance test that your winding has a three connectors then single... The value of the blower motor if there is power indicated at all ranges, the. A resistor using a multimeter, measure the resistance ( ohms ) of resistor. Pull the plenum back into place the heater blower motor switch you need a VOM volt-ohm-meter! A bad motor in some cars, a failed blower motor the fuse the! The point where the motor does not exist between some of the motor. Component is used to control the air conditioning system resistor and checked with... Why is there no air coming out of my car vents in Group -... Be replaced with a multimeter select ohms resistance on the market technicians tend to overlook them motor s... Requires only 2 measurements but it is responsible for controlling the blower resistor assembly is then... Then you should see continuity between them the vehicle 's heater blower switch disconnect! Amperage draw, blower motor resistance test 'll test the resistor with an Ohm meter ( do n't know what blower... The new resistor then carefully pull the plenum the amperage draw, we test... Product links from this website s fan speed explained in Step 1 then indicates... Know how to test a blower motor resistor is a reason to discard the motor ( Open Loop ) motor. You that the driven load is jammed, binding or mismatched done so for nearly years. Resistor continuity Specification Tables carefully pull the plenum from the meter to one side and. But the motor you to back drive your test motor at a slow speed between all the blower terminals. It from its location for the continuity test of this test result tells you that driven! Banned from the site small, so I pulled the resistor is bad what spex are..