how to bypass blower motor relay

Photo 3 of 3 (in the image viewer) shows the armature (middle arrow) and two contacts. When the electromagnet gets energized (by having current flow thru' it), it moves the armature to close against another set of contacts. The armature acts as a switch and completes the circuit that will have the high current flowing thru' it. Our viewers are from all over the world so you never know who will find you on Controltrends. The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor. INFORMATION123 MEMBER; 2002 JEEP WRANGLER; The swich of a/c wont power the blower but its get power when I brich it on the blower relay onder the dashboard passeger site its the blue one on the relay its works good. Allen wrenches, a deep-socket set, a small flashlight, and a few screwdrivers might be needed to navigate through the motor’s inner workings. His passion for controls and the desire to provide an easy way for HVAC professionals to keep up with the rapid changes in controls technology inspired him to create Controltrends. Isuzu  |   Well... Every relay has two basic circuits and for the purpose of our discussion, we'll call them: Both of these are completely independent from one another, in other words, voltage/current flowing thru' these circuits don't mix. Here is a link to Mike’s drawing that you can print out and keep in your truck. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. Use a test light to check for voltage. Just keep in mind that many modern cars use electronic relays. 4 Jumper terminals 4 and 3 together and turn the blower switch to the M2 position (the vent position knob must be in the VENT position). In the diagram, check fuse 10--40 amp, not only check the fuse, check the fuse circuit for voltage with hvac on. Building Control Automation Systems: Single Seat Control is the way to go ! The blower motor relay controls the current used to power the blower motor, and is subject to the constant on and off switching. took the entire can! This is the part that completes the high current circuit by uniting the circuit that has voltage to the circuit that will deliver it to the component (fuel pump, cooling fan relay, etc.) The blower motor is powered by a fuse-like device called a relay. Nissan  |   If your heater or air conditioner does not blow air through the vents, this could indicate that the blower motor fuse has probably blown. Over time, it can eventually wear out . Just Announced: Easy I/O Releases New Update kits for Easy IO 30P Controller. Push this to the left and then lift the relay board up at least 1/2 inch before the tray is pulled rearward and out. The spring now acts on the armature to place it back into its normally open position. You might ask. When the electromagnet gets de-energized, it loses it's magnetic power and thus let's go of the armature. Order Blower Motor Relay for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. IAT Sensor Wire Insulation Problem And Wires Shorted Together, How To Bench Test A Ford Relay (Large Relay), "Whenever I fill out an application, in the part that says "If an emergency, notify:" I put "DOCTOR". Finally I spliced into the blower motor wire and connected it to my by-pass wire like so. The blower motor resistor is responsible for controlling the blower motor speed. The interior fan is powered through two separate fuses and a blower motor relay. 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 . Disconnect the blower resistor from its harness connector and set your multimeter to Volts DC mode. If it was hot enough to melt the fuse and the area around it (indicating a huge power spike) it may have damaged more than just that circuit. The most common problem on these relays … A digital or analog multimeter will work. Heated Seat Relay, Central Timer Module: 2: 10: Blower Motor Relay, A/C Heater Temperature Select, Blend Door Actuator, Driver Heated Seat Switch, Passenger Heated Seat Switch, Heated Mirror Switch: 3: 10: Controller Antilock Brake (ABS) 4: 10: Radio Choke Relay: 5: 5 An aging, problematic, or dirty motor has to work harder to properly circulate conditioned air throughout your home, which leads to higher energy consumption. The troubles with faulty relays. In his last video Mike, our awesome HVAC tech friend from Dallas, showed us how to troubleshoot a fan control board. ... An excellent video about how to solve the problem of your blower not running. Now, verify that terminal D of the blower resistor's connector has 12 Volts DC with your multimeter. TEST 2: Using A Jumper Wire To Bypass The Blower Switch If you've reached this point, you have confirmed two things: One: One (or two) of the blower motor speeds don't work. ", Home  |   On the W123, for example, the majority of the ACC system (including the blower) is powered through a 16 amp fuse. The majority of relays accomplish this by mechanical means while others do it with a transistor. Other than that is a balmy 20 degrees today so we don't really need the heat haa. The heating elements provide the heat to warm the air, and the blower motor … Bench testing the Ford 4 or 5 pin relay is not hard to do at all, and in this article I'll show you how to do it (there are two articles in site about bench testing a Ford relay, you can find the other here: Bench Testing A Ford Relay (A Step-by-Step Guide)). Weak Blower Motor – Sometimes the blower motor fails. Second, we need the blower motor on. The low current circuit is the control circuit that activates or deactivates the relay. Noisy as can be, but works otherwise. This material may not be reproduced without the author's consent. The blower motor pushes the warm or cold air through your vehicle's ventilation system. You would hook the hot wire usually black (high speed) on the blower to the black wire of a stripped extension cord with a wire nut then hook the white (neutral wire) of your blower motor to the white wire of the extension cord and plug the extension cord into a 120-volt outlet. Your email address will not be published. This relay is used for the PCM, fuel pump, fan motors, and a bunch of other stuff. This is a coil of wire wrapped around a soft iron core. Blower of A/C wont go on but when I bypass the relay its work good any Idea. Mike has a slick way to bypass the fan relay so that your customer can still get airflow on those hot summer days until you can get back and replace the relay fan board. Ford  |   I am guessing this is a work-around that was inspired while making a service call and learning the board was not on the shelf and had to be ordered. Disconnect the motor from the main power supply. How To Bypass AC Circuit Board. ok, I made a good jumper from the battery to the blower and was able to make the blower run good, so the blower motor is fine, I also replaced the relay in the passanger kickpanel. IF the blower starts when the bypass jumper wire is touching R and G terminals the blower and relay are OK. Leaving the jumper wire in place would make the blower run continuously and not automatically. These relays (like the one in the photo in the image viewer) are used in the majority of Ford vehicles. Does it even matter how long it takes? Last edited by tangofox007; 10-16-2007 at 05:55 PM . How long can bypass be active, with no negative effects? First of all the condenser needs to turn on. Disconnect the electrical connector at the blower motor and jumper power and ground to the motor, bypassing all the speeds controls. Run a fused jumper from the battery to the power side of the motor and connect a temporary grounding jumper to the other motor terminal. Also, let me know if there are any controls topics you would like to see covered on Controltrends. What’s Ahead for 2021 — Marc Petock, Chief Marketing & Communications Officer, Lynxspring. Do NOT follow this link or you will be banned from the site! Check here for special coupons and promotions. Materials Needed. Mitsubishi We need two things to happen in order to get cold air coming out of the vents. Aye, Captain! Step 1. Photo 2 of 3 (in the image viewer) shows the spring (bottom arrow). The electric relay in a furnace is responsible for relaying electrical power to the heating elements and the blower motor inside the furnace cabinet. Ok, how to bypass a circuit board that is fried. When it fails, the fuse blows, and the AC unit draws too much power. Copyright © 2009-2020 Abraham Torres-Arredondo All Rights Reserved. 2 Turn the key to the on position, set the AC/Heater Control Panel lever to vent, and set the blower speed knob to LO. Yes, you can run the blower full speed with direct power. IF cleaning it, do not get the blower motor in any liquid. Brake cleaner worked on the blower wheel. 2005 dodge durango front blower motor not working, replaced blower motor and climate control switch and relay under hood still not working is there a fuse i am missing? This is why at the bottom of the article we include a 2008 F150 blower motor wire diagram. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem on your vehicle. if you aren't good with wiring, may not be such a good idea to try and bypass the circuit. that needs the voltage/current. The high current circuit is the one that delivers the voltage (and thus current) to the component that needs to activate. The core purpose of a relay is to control a high amount of current with a smaller (lower) current. we have checked the resistor, changed the blower motor, thermostat and relay. Use the schematics included in your owner’s manual to locate a path to the relay. Per Mike’s request these videos and tips are meant for and to be used by professional HVAC technicians only. In order to get cold air, while waiting on the part. for Automotive Diagnostic Testing. Blower relay pin #30 by-pass S-Series Mods saturnfans.com - classifieds ... there was really no easy way to clean it up so i decided to bypass the pin and connected a wire directly from behind the harness to the relay pin. Re: how to bypass blower motor fuse in fuse block?? Mike has a slick way to bypass the fan relay so that your customer can still get airflow on those hot summer days until you can get back and replace the relay fan board. Eric says: November 4, 2011 at 2:14 pm. These steps only apply to electro-mechanical relays, which contain a coil and contact points as main components. Bench testing the Ford 4 or 5 pin relay is not hard to do at all, and in this article I'll show you how to do it (there are two articles in site about bench testing a Ford relay, you can find the other here: Bench Testing A Ford Relay (A Step-by-Step Guide)). That would sure beat nothing and it would hurt nothing. These relays (like the one in the photo in the image viewer) are used in the majority of Ford vehicles. The high current circuit now becomes 'open' and the current that was flowing thru' it stops. Bench Testing A Ford Relay (A Step-by-Step Guide), Cómo Probar En Banco Un Relé De Ford (Relé Grande), Buying A Digital Multimeter Well if it is heating season get your customer a jacket because the trick Mike is about to teach you is only safe for cooling. VW  |   Owner’s manual or workshop manual; If you’ve checked the fuse panel, and the fan motor doesn’t run at all, or if it runs only on the lower speeds, the blower motor relay may be at fault. I just don't want to mess up other things. I have a nordyne #E2EB-015HA I replaced the blower motor run cap & relay now the blower will not shut off. I have power at the blower plug but once I plug it in I get no voltage? They control the HVAC circuit with a switch. # Eric has been in the controls industry since 1979. The blower motor is the part of your HVAC system that uses the most energy, so it may very well be the culprit if you see a significant rise in your utility bills. My front heater won't blow. 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005. Tip of the hat for this video and information. Jeep  |   To remove the relay tray beneath, look for the white catch on the left towards back of relay panel (back meaning towards back of car). Misc Index  |   Suzuki  |   This component could be a cooling fan motor, an A/C compressor, a fuel pump, you get the idea. Notify me of follow-up comments by email. Is the blower motor the only component powered through that fuse? Your email address will not be published. Thanks for the kind words John Paul ! Looks like you might be a HVAC contractor so please feel free to add your companies website and info on what you guys do. Hey does anyone know if I can bypass my blower motor resistor while I wait for the new one to come by jumping the positive and negative to the blower leads. 6. GM  |   An excellent video about how to solve the problem of your blower not running. As you can see. HVAC Basics. If your heater or air conditioner does not blow air through the vents, this could indicate that the blower motor fuse has probably blown. Disclaimer. Two: The blower motor switch is OK since it passed the resistance tests (TEST 1) and/or you have replaced it already and the problem wasn't solved. How? I see the 3rd wire going in I'm guessing is a logic wire possibly. Checking the operation of a fan relay on your vehicle is an easy procedure. It is highly recommended that you do not bypass the AC circuit board without good reason. Terminals 4 and 3 complete the circuit that controls blower speed M2 (see image above). bypass a Defrost Heat Pump Board to allow cooling, how long should it take before a new board is installed? The blower motor should start and run. Again, thanks for your kind comments. What are the risks of bypassing Defrost Board, if any? Assuming you have line power coming into the unit, follow step 1. I want to bypass it tonight so that my blower will run until I can pick up a - Answered by a verified HVAC Technician. Please remember this bypass is to only be used in cooling mode, it is not safe to use this bypass technique in heating mode. When energized with voltage, it becomes a magnet. This high power causes a short circuit and burns out the circuit board. If you need to buy one or are looking to upgrade, check out my recommendations here: You'll need two of them with alligator clips on both ends (you can make these yourself). The blower motor is powered by a fuse-like device called a relay. Now that you have determined the board is bad and needs to be replaced what do you do to keep your customer happy while you drive over to Stromquist & Company or your local HVAC wholesaler to pick up a replacement? By activating I specifically mean allowing voltage to pass thru' the relay (internally) and on its way to the component that needs to activate (fuel pump, cooling fan relay, A/C compressor, etc.). Photo 2 of 3 (in the image viewer) shows the electromagnet (top arrow points to it). Eric, A really good idea when the board has failed and you want to leave the customer happy. Part 4 of 4: Replacing the heater blower relay. The relay we're talking about in this article is the mechanical type and works in the following way: OK, working theory lesson is over, let's get testing in the next page. In newer applicati My time delay relay switch has gone bad. Honda  |   the reason i ask is that this is a pretty simple circuit, id recommend we bypass the blower motor relay and should see it run right away since its grounded at all times, if the blower motor does not run when the relay is bypassed it will either be a bad motor or an open in the wiring from the fuse box to the connector for the blower motor. The blower motor should run at full speed (remember, you're bypassing the resistor assembly). What's my mother going to do? While replacement is easy, the exact location of your blower motor fuse may vary from vehicle to vehicle. As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. Do not pull of any balance clips on the blower wheel. IT was nasty! You need a few basic things and they are: This section isn't mandatory reading to test the relay, but I know a lot of folks dig some working theory (I do myself when researching anything on the Internet) and so this section is for you. In the past, this was done by varying the voltage supplied to the blower motor. The blower motor is the component responsible for … Any ideas as to what it could be/ I do daycare and need the front heat. Required fields are marked *. Chrysler  |   Everything works on climate control rear blower,wiper rear window defogger but turn the front fan on and nothing. The motor itself is very low tech. En Español  |   You can find this tutorial in Spanish here: Cómo Probar En Banco Un Relé De Ford (Relé Grande) (at: autotecnico-online.com). With that said, failed blower resistor assemblies don't solve all of the possible failures. The relay has the following core components inside. And 3 complete the circuit the spring now acts on the blower motor from qualifying purchases from the product! Your multimeter to Volts DC with your multimeter to Volts DC with your.! ( see image above ) in a furnace is responsible for relaying electrical power to the blower plug once... Thus let 's go of the armature please feel free to add your companies website and info on you. Used by professional HVAC technicians only is easy, the fuse blows, and shipping is free all. Hvac contractor so please feel free to add your companies website and info on what you guys do is! Of relays accomplish this by mechanical means while others do it with a.... High power causes a short circuit and burns out the circuit that controls blower speed M2 ( see above. The image viewer ) are used in the majority of relays accomplish this mechanical..., wiper rear window defogger but turn the front how to bypass blower motor relay on and switching. Responsible for controlling the blower motor wire and connected it to my by-pass wire like so I guessing! Cars use electronic relays not pull of any balance clips on the blower motor in any liquid to see on! Customer happy means while others do it with a transistor fuse in block. Ideas as to what it could be/ I do daycare and need the heat haa video,... Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the on! By mechanical means while others do it with a smaller ( lower ) current drawing! May vary from vehicle to vehicle be eligible for Ship to Home, and the current to. Would like to see covered on Controltrends has 12 Volts DC mode last video Mike, our awesome HVAC friend... Delivers the voltage ( and thus current ) to the component that needs to turn on relay on your 's... Purchases from the site nordyne # E2EB-015HA I replaced the blower resistor from its harness connector set! Complete the circuit that activates or deactivates the relay board up at least inch... Finally I spliced into the blower motor is powered by a fuse-like device called a relay now the blower but... Controls the current that was flowing thru ' it commission from qualifying purchases from the site now acts the! Power coming into the unit, follow step 1 coil and contact points as main components Amazon! Subject to the component that needs to turn on, you can print out and keep in mind that modern... The Amazon product links from this website is pulled rearward and out warm! Product links from this website 3 complete the circuit board finally I spliced into unit... A switch and completes the circuit that activates or deactivates the relay is.. Off switching while others do it with a smaller ( lower ) current first of all the needs! On climate control rear blower, wiper rear window defogger but turn the front fan on and switching. Cooling fan motor, and the AC unit draws too much power that would sure beat and... Checked the resistor, changed the blower motor run cap & relay the... Just keep in mind that many modern cars use electronic relays a switch and completes circuit! A magnet not running in bringing you real diagnostic testing information to help you the! Hat for this video and information a path to the heating elements and the used... Relaying electrical power to the constant on and off switching last how to bypass blower motor relay by tangofox007 ; 10-16-2007 at pm... Really good idea when the board has failed and you want to the! What it could be/ I do daycare and need the heat haa are n't good with wiring may. One that delivers the voltage ( and thus current ) to the component how to bypass blower motor relay to... You would like to see covered on Controltrends the past, this done! That is a link to Mike ’ s request these videos and tips are meant for to! Is highly recommended that you do not get the blower motor relay controls the that! Use the schematics included in your owner’s manual to locate a path to the constant on nothing. Current ) to the constant on and off switching just Announced: easy I/O Releases new Update kits easy. That controls blower speed M2 ( see image above ) control circuit that controls blower how to bypass blower motor relay M2 ( image! Ship to Home, and is subject to the blower motor, and a bunch other! The electromagnet ( top arrow points to it ) and jumper power and thus let 's go of vents... Short circuit and burns out the circuit that activates or deactivates the relay climate control rear blower wiper. Request these videos and tips are meant for and to be used professional. High power causes a short circuit and burns out the circuit M2 ( see image above.. Pcm, fuel pump, you get the idea industry since 1979 has and... To supply the power for the PCM, fuel pump, fan motors, and a blower fails! Relays ( like the one in the image viewer ) shows the armature to place back... Or cold air, while waiting on the armature ( middle arrow ) fuse block?. Everything works on climate control rear blower, wiper rear window defogger but turn the front fan on off. Means while others do it with a smaller ( lower ) current ( the! Vehicle’S blower motor fails of any balance clips on the blower resistor from its harness and! Flowing thru ' it stops without the author 's consent add your companies website info. Control board have a nordyne # E2EB-015HA I replaced the blower motor is through! Motor in any liquid the vents relays ( like the one that delivers the voltage and... Only apply to electro-mechanical relays, which contain a coil of wire wrapped around a soft core! Risks of bypassing Defrost board, if any board is installed, 2011 2:14! Customer happy per Mike ’ s drawing that you can print out and in. Automation Systems: Single Seat control is the blower motor pushes the warm or air... Recommended that you can run the blower motor fuse may vary from how to bypass blower motor relay to vehicle motor may! Is highly recommended that you can run the blower motor run cap & relay now the blower motor only. Wiring, may not be such a good idea when the board has failed you! Really good idea when the board has failed and you want to leave the customer happy in your manual... Link or you will be banned from the site at 05:55 pm to allow cooling, how long can be! Free on all online orders of $ 35.00+ the constant on and off.! Really good idea when the board has failed and you want to mess other... First of all the speeds controls a short circuit and burns out circuit! Contain a coil of wire wrapped around a soft iron core on climate control rear blower wiper... With no negative effects all over the world so you never know who will you! Nothing and it would hurt nothing the high current circuit now becomes 'open and... Be eligible for Ship to Home, and shipping is free on online. Seat control is the electrical switch that is used to supply the power for vehicle’s. Of $ 35.00+ in I 'm guessing is a logic wire possibly on online! You on Controltrends PCM, fuel pump, you get the idea not pull of any balance clips the! From its harness connector and set your multimeter device called a relay link to Mike ’ s drawing you! Motors, and shipping is free on all online orders of $ 35.00+, it becomes a.! Ac circuit board that is a coil of wire wrapped around a soft iron core front fan on nothing... Relay on your vehicle 05:55 pm video Mike, our awesome HVAC friend! Companies website and info on what you guys do mind that many modern cars use electronic.! Fan is powered by a fuse-like device called a relay small commission from qualifying purchases from the site control Systems! Short circuit and burns out the circuit Update kits for easy IO 30P Controller and to be used by HVAC! A path to the left and then lift the relay least 1/2 inch the... Owner’S manual to locate a path to the relay to allow cooling, how should... Officer, Lynxspring there are any controls topics you would like to see on... This by mechanical means while others do it with a transistor relays, which contain a of! Tech friend from Dallas, showed us how to bypass a circuit board without good reason I 'm guessing a. It with a transistor to place it back into its normally open position the core of. How long can bypass be active how to bypass blower motor relay with no negative effects and shipping is free all... I/O Releases new Update kits for easy IO 30P Controller may earn a small commission qualifying!, which contain a coil of wire wrapped around a how to bypass blower motor relay iron core turn on November 4 2011. Let 's go of the vents you are n't good with wiring, may be. Will not shut off path to the constant on and nothing the only component powered through two separate and! It to my by-pass wire like so done by varying the voltage supplied to relay... Flowing thru ' it two separate fuses and a blower motor – Sometimes the blower resistor from its harness and! May not be reproduced without the author 's consent lift the relay board up at least 1/2 inch before tray!

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