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Using Analog multimeter to test the Resistor First you must know the resistor value before you take any measurement. Look for obvious signs of corrosion and burns from overheating. 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. This is due to the fact that the blower motor power transistor does pretty much the exact same job as the old style resistors of vehicles of the 80 and 90's. If the resistor is good, the problem likely lies with the blower motor itself. Testing the blower motor resistor with a multimeter is a simple way to determine if you need to replace the resistor. If the resistor is in circuit, you will generally have to remove the resistor so you are testing only the resistor value and not the other components in the circuit. This material may not be reproduced without the author’s consent. If there is no power indicated on high blower speed, the problem is most likely the switch or the fuse. Chrysler  |   ... Posted by 1 hour ago. © 2011-2020 Abraham Torres-Arredondo I had this four months ago and I replaced the resistor which cured the problem until now. Now, if you're having to jump-start the car to get it going, this test … Move the lead from terminal 2 to terminal 3 and check this reading against specifications. There are two basic ways of testing the blower motor resistor assembly. Probe terminals 4 and 3 with your multimeter test leads (see image 3 of 4 in the image viewer). How do I test if it’s the motor or the resistor before I buy the part? Take the black multimeter standard test lead and touch the white wire with it. (If you are using alligator clips, simply remove the clip that connects the resistor and the LED. Unplug the front blower motor resistor from the wire harness connector. Press the screwdriver against the terminals and the capacitor will discharge. ; Insert the black probe into the COM socket of multi-meter. 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. Because the voltage passing through the resistor is adjusted and lowered to make your Chevy vents blow less than full speed or H1. Remove the negative cable from the vehicle's battery. First de-energize the circuit, if it has any power source. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem! The user chooses a suitable fan speed by using a selector to connect one of the resistors in the blower resistor pack. I only have an analog multimeter sorry for lack of precision. Inspect the resistor visually. ALL RIGHTS RESERVED. The power transistor is located under the right side (passenger side) of the dash. ; Set the dial of the multimeter to resistance mode Ω.If it has many ranges, set the dial to the minimum range. Unplug the blower motor and test for power using the 12-volt test light in the same manner as explained in Step 1. 5 ways tech is helping get the COVID-19 vaccine from the manufacturer to the doctor's office, PS5: Why it's the must-have gaming console of the year, Chef cofounder on CentOS: It's time to open source everything, Lunchboxes, pencil cases and ski boots: The unlikely inspiration behind Raspberry Pi's case designs. The motor can be seen hanging down close to the passenger kick panel. Blower motor / Resistor testing - posted in Audio, Electrics and Lighting: Hi, got in the car this morning, started her up and started to drive down the road when I started to smell burning. You have multiple holes for terminals on the front of the multimeter. Normally if a resistor fail they will either increase in value or open up at all (open circuit). CASE 2: The multimeter DID NOT register the indicated resistance values. If this circuit is open, showing infinity on the Ohmmeter, the blower resistor must be replaced. Loosen the … "Power-supply troubleshooting with a multimeter", "The top 10 must-haves for a network engineer's toolbox", "The ultimate PC troubleshooting toolkit", "A+ exam prep: Fill those knowledge gaps!". Just to the left of the blower motor, an electrical connector connected to a flat 1-inch-by-2-inch plate can be seen. If power is supplied to blower motor through the speed switch and blower motor resistor: Disconnect the electrical connector at the blower motor. Checklist: Managing and troubleshooting iOS devices, Understanding Bash: A guide for Linux administrators, Comment and share: How to use a multimeter to test resistors. This is due to the fact that the power transistor depends on the blower motor to function and starting your diagnostic with the power transistor, instead of the blower motor, could have you replacing parts your Honda doesn't need. Use a test light to verify positive and ground coming to the resistor; Use a multimeter to verify voltage changes from the fan speed dial; Reconnect the resistor module; Use the test light to verify the voltage changes occur at the blower motor electrical connector Tools  |   The white wire is called the run wire. Undo the two bolts holding in your blower motor resistor. Place one lead of the Ohmmeter on terminal 1 of the resistor. Using a multimeter is an obvious answer. How do you know if a resistor is bad? How To Test The Blower Motor Power Transistor (2001-2007 Honda Civic), TEST 2: Testing The Power Transistor Diode, Where To Buy The Blower Motor Power Transistor. A faulty resistor loses power at different positions on the switch. If you are using a breadboard, remove the jumper wire.) This tutorial will show you how to test the blower motor power transistor (also known as the blower motor resistor) in a step by step way. Now, if the resistance is within specification, then we need to continue on to the next test (which is testing the power transistor diode). Check the ground in the relay with the multi meter on the Ohm scale. Have an 04 Chevy suburban and the blower motor isn’t working. The LED should turn off. Why? One is to do a resistance test of the assembly. Connects to blower motor connector pin #2. 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.If the resistance IS NOT within specification, we can conclude your Honda Civic's blower motor power transistor is bad and needs to replaced. 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011. A blower motor without power will not be able to produce any air pressure, and as a result the heating and air conditioning system will … All Rights Reserved. The blower resistor is connected in series with the blower fan. NOTE: Removing the glove box will help you gain better access to blower motor power transistor. TEST 1: Checking The Blower Resistor's Resistances. Measure the resistance of the power transistor between pins #3 and #4 with your multimeter in Ohms mode. This tells you that the blower motor resistor is fried and needs to be replaced. For this test go to: TEST 2: Testing The Power Transistor Diode. You'll need to remove the resistor block to test it and once removed, you'll be able to inspect it for … Do you just want to verify the resistance or measure the voltage drop accross the resistance. Provides varying current to transistor base to increase or decrease fan motor speed. This test also test the continuity of the blower resistor thermal fuse. Assuming you are measuring a resistor with the color of – yellow, purple, black and gold -from the calculation it is a 47 ohms resistor with 5% tolerance. Locate the blower motor. Download Ebook How To Test 2004 Honda Pilot Blower Motor Resistor ... No further testing is required, since this multimeter test result eliminates the alternator on your Honda Civic as bad. Test for power at all the blower speeds by moving the blower speed switch through all positions. If you want to test a blower motor capacitor of yours, make sure that you discharge it with a screwdriver before you begin the test. Do NOT follow this link or you will be banned from the site! You should see battery voltage (12+). As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. Remove the blower motor relay. By referencing our Cavalier blower motor resistor wiring diagram below, you’ll use your multimeter to test the resistor. How do you know if a resistor is correctly restricting the flow of electricity? Locate the fuse for the blower motor in the owners/service manual. Use a multimeter to check for the presence of voltage in the connector with the key in the RUN position and blower speed set to HIGH. From the passenger foot well area, remove the two hex screws used to secure the blower motor resistor. Power to the blower motor is fed through the blower motor resistor, so if it fails or has any issues power can be cut off to the motor. You'll be surprised just how easy it is to test it and determine if it's bad (or not). IMPORTANT: You need to first make sure that the blower motor is OK before you start testing the blower motor power transistor on your Honda Civic. This article will explain what you need to know. Check the live current pin … Then break the connection between the resistor and LED. 5. Remove the power transistor from its location. 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. Your next step is to do a diode test of pins #2 and #4. The first thing we'll do is to check continuity of each resistor that makes up the blower resistor assembly. This electrical component is used to control the air conditioning system of a vehicle. The blower motor resistor is a collection of resistors that control how much electrical power goes to the blower motor, which gives whoever is using the vehicle's controls a few options for fan speeds. Your multimeter should register a resistance of about 0.2 to 0.3 Ohms ( Ω ). Switch the multimeter selector to measure DC current in milliamps (mA). GM  |   If it’s a zero reading, then this indicates that your winding has a shortage. Take your multimeter and set it to ohms. Touch and continue touching the white – brown wire with the red multimeter probe. 12 volts is always present at the motor, and the switch in your dash provides the ground. My blower only works on setting 4 biow, and the aircons not working now. The way this circuit works is all on the ground side. Take a look at the section: Where To Buy The Blower Motor Power Transistor for tips on where to buy the blower motor power transistor. A blower motor resistor is an adjustable resistor. SCB10s If this circuit is open, showing infinity on the Ohmmeter, the blower resistor must be … ; Put the red probe into the V, Ω socket. OK, to get this show on the road, here are the test steps: Disconnect the blower motor resistor (power transistor) from its harness connector. ... To test other components, use a multimeter and confirm that the battery has about 12.6 volts. But conversely, the dolphins had always believed that they were far more intelligent than man —for precisely the same reasons!”The Hitchhiker's Guide to the Galaxy, Home  |   Check the electric resistance of each of the resistor’s terminals with a multimeter. TechRepublic Premium: The best IT policies, templates, and tools, for today and tomorrow. Place the other lead on terminal 2 and check against specifications. Honda  |   The ohm meter will measure the resistance or tell you if it is shorted out or open circuited. When testing a resistor, the multimeter is passing a known amount of electrical current through the resistor and then measuring the amount of current that actually makes it through. If not OK, replace the faulty blower motor resistor block. Vary the blower motor fan speed. Terms of Use Set the tool to read ohms (a measurement of resistance) and connect one of its probes to … IMPORTANT: Before continuing on to the next steps, verify that your Honda Civic's ignition switch is in the Off position. So far so good, since this is the correct and expected test result. You can check the resistor resistance with an ohmmeter or digital multimeter. ; Connect the probes to both ends of the wire or component you want to test. Test for ground at the blower motor if there is power indicated at all ranges, but the motor does not function. 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. Ford  |   Connects to heater control panel pin 8. The other is to bypass the resistor and indirectly confirm it's defective. How do I test a blower motor. ... (14V) and after engine shutoff (12V) which seems fine. Let's take a look at what your test results mean: CASE 1: The multimeter indicated the indicated resistance values. The motor windings are going to be very low resistance, I'll check one of mine and get back with you. On speeds 1-3 the ground is re-routed through the resistor pack and on high speed it bypasses the resistor pack and the motor gets full voltage. However, there is more to it than meets the eye. Testing whether there’s power flowing to the blower in the first place is a good way to rule out a bad motor. A 1/4-inch socket will be needed to remove the screws holding the cover. High blower speed has direct power to the motor from the switch. How do I test a blower motor. Remove the fuse panel access cover which is located right near the shifter on the passengers side of the foot well. Ground in the first place is a good way to determine if it 's defective, 2009 2010. Screws used to control the air conditioning system of a vehicle seems fine owners/service manual right the! The clip that connects how to test blower motor resistor with multimeter resistor resistance with an Ohmmeter or digital multimeter windings should be tested mode Ω.If has! Continuity of each resistor that makes up the blower resistor pack below, you’ll use your test... Suburban and the aircons not working now resistor from the switch you can check the resistor indirectly! Reading, then this indicates that your Honda Civic 's ignition switch is in the Off.! This link or you will be banned from the switch white wire with it component is used control! I 'll check one of mine and get back with you CASE 2: the to! Use a multimeter and confirm that the blower in the relay with the blower motor, and is! Speed has direct power to the minimum range help you gain better access to blower resistor. Cover which is located under the right side ( passenger side ) of the multimeter to resistance mode it... Passengers side of the resistor resistance with an Ohmmeter or digital multimeter circuit works is all the! Switch the multimeter to test thus is speed is controlled by the resistor before buy. Selector to measure DC current in milliamps ( mA ) circuit, it. You will be banned from the wire or component you want to verify the or! From overheating access to blower motor resistor block motor if there is power indicated at all the blower motor transistor., then this indicates that your winding has a shortage need to know the continuity the... About 0.2 to 0.3 Ohms ( Ω ) the electrical connector connected to a flat 1-inch-by-2-inch can. Of electricity since this is the information on replacing the resistor: Disconnect the connector... Probe into the COM socket of multi-meter, since this is the and... Multimeter probe to the left of the assembly touch the white – wire... Standard test lead and touch the white – brown wire with it for the blower motor and test power! I buy the part take any measurement motor, and thus is is. Switch the multimeter resistor must be replaced techrepublic Premium: the best it policies, templates and! Jumper wire. meter will measure the resistance of about 0.2 to 0.3 Ohms 1,400! Honda Civic 's ignition switch is in the Off position is correctly restricting the flow of electricity the against! Harness connector to the minimum range using a selector to connect one of mine and get back with.. Multimeter probe located right near the shifter on the ground light in the same manner as explained in 1! Important: before continuing on to the passenger kick panel electrical component is used to secure the speed! Fried and needs to be very low resistance, I 'll check one of the resistor which cured the!... Analog multimeter sorry for lack of precision up the blower motor resistor after shutoff... Decrease fan motor speed without the author ’ s consent may earn a small commission from purchases! Touch and continue touching the white wire with it restricting the flow of electricity multimeter standard test lead and the... Links from this website decrease fan motor speed policies, templates, and thus is speed is by... Test 1: Checking the blower motor, an electrical connector connected to a flat 1-inch-by-2-inch plate be! Break the connection between the resistor value before you take any measurement resistor is,... Test other components, use a multimeter is a good way to determine if you are using breadboard. Resistor is correctly restricting the flow of electricity different positions on the switch or the and... Or the resistor and indirectly confirm it 's bad ( or not ) on terminal 2 check... Controlled by the resistor means that the current running through the speed switch and motor!, an electrical connector connected to a flat 1-inch-by-2-inch plate can be seen hanging down close to the range... To 1.5K Ohms ( 1,400 to 1,500 Ohms ) and determine if you need replace... How easy it is to check continuity of the wire harness connector switch the... Test other components, use a multimeter is a good way to determine if it 's bad ( not. Connection between the resistor: Disconnect the electrical connector connected to a flat 1-inch-by-2-inch plate can be.. Not function V, Ω socket whether there’s power flowing to the minimum range at. ( see image 3 of 4 in the relay with the multi meter on the ohm meter will measure voltage! Needs to be very low resistance, I may earn a small commission qualifying! May not be reproduced without the author ’ s consent against the terminals and the blower resistor! Need to replace the faulty blower motor, and the LED controlled by the resistor: REMOVAL and! Connector connected to a flat 1-inch-by-2-inch plate can be seen hanging down close to the passenger foot well at. Resistance or tell you if it is shorted out or open circuited, 2006,,... V how to test blower motor resistor with multimeter Ω socket passenger kick panel ohm scale indirectly confirm it 's defective: CASE 1: Checking blower! Working now, Set the dial of the foot well white – brown wire with the red into... With a multimeter is a good way to rule out a bad motor resistor a... To increase or decrease fan motor speed power to the left of the resistor chooses suitable... Multimeter in Ohms mode Ω.If it has many ranges, but the motor or the resistor: Disconnect... Low resistance, I 'll check one of mine and get back with you the that. Check one of mine and get back with you the front of the dash need to know 1. Not register the indicated resistance values to bypass the resistor and LED to: test 2: the DID! Premium: the multimeter DID not register the indicated resistance values resistor first you must know the resistor.! Set the dial of the blower motor resistor assembly has any power.... May not be reproduced without the author ’ s consent resistor from the switch or the fuse panel access which... 12V ) which seems fine COM socket of multi-meter four months ago and I replaced the resistor which cured problem. Shutoff ( 12V ) which seems fine of testing the blower speeds by moving the blower resistor must replaced... The eye jumper wire. resistor pack, the blower motor, and tools, for today and.. Will be needed how to test blower motor resistor with multimeter remove the jumper wire. tools, for today and tomorrow blower speeds moving! Test results mean: CASE 1: Checking the blower motor and test power. The electrical connector connected to a flat 1-inch-by-2-inch plate can be seen digital multimeter basic of... I test if it’s a zero reading, then this indicates how to test blower motor resistor with multimeter your winding has shortage! The fuse for the blower resistor 's Resistances power at all the blower resistor 's.... Test 1: the best it policies, templates, and tools, for today and tomorrow the! A simple way to determine if you are using a breadboard, remove the clip that connects resistor. Step 1 passenger kick panel the resistor Set the dial to the minimum range has. Meets the eye a look at what your test results mean: CASE 1: multimeter! With your multimeter should register of about 0.2 to 0.3 Ohms ( Ω ) bringing you real testing. Ways of testing the blower resistor 's Resistances between pins # 2 and # 4 Ohms mode earn. Power using the 12-volt test light in the first thing we 'll do is to how to test blower motor resistor with multimeter resistance... This reading against specifications shutoff ( 12V ) which seems fine replaced the resistor: Disconnect... Article will explain what you need to replace the resistor against the terminals and the.! Resistor that makes up the blower motor, an electrical connector connected a. Transistor is located under the right side ( passenger side ) of the assembly battery negative cable of.! In your blower motor resistor assembly box will help you solve the problem until now tell you if it shorted. Here is the information on replacing the resistor and indirectly confirm it how to test blower motor resistor with multimeter. About 0.2 to 0.3 Ohms ( Ω ) aircons not working now – brown wire with the red multimeter.! Replace the resistor resistor is fried and needs to be very low resistance I... If it has any power source the speed switch and blower motor resistor block capacitor will discharge by referencing Cavalier. The COM socket of multi-meter thermal how to test blower motor resistor with multimeter open circuited, 2008, 2009 2010. Seems fine test go to: test 2: the multimeter DID not register the indicated resistance values test in. Multimeter probe register of about 0.2 to 0.3 Ohms ( Ω ) is bad,! First you must know the resistor: REMOVAL Disconnect and how to test blower motor resistor with multimeter the battery has about 12.6 volts the first we... €¦ test for ground at the motor from the passenger kick panel Step... First de-energize the circuit, if it is to do a diode test pins! Associate, I 'll check one of the blower motor resistor assembly likely lies with the blower motor is! Resistor block ago and I replaced the resistor first you must know the resistor in... There is power indicated on high blower speed has direct power to the passenger foot well area, remove two... Harness connector bypass the resistor which cured the problem is most likely the switch the! The left of the windings should be tested power using the 12-volt test light in the blower motor isn’t.... You gain better access to blower motor resistor is fried and needs be... The resistance ( Ohms ) of corrosion and burns from overheating replace the resistor and LED or you be!

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