Ford  |   The majority of relays accomplish this by mechanical means while others do it with a transistor. Check here for special coupons and promotions. ", Home  |   The blower motor is the component responsible for … On the W123, for example, the majority of the ACC system (including the blower) is powered through a 16 amp fuse. 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? 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. When it fails, the fuse blows, and the AC unit draws too much power. 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)). Aye, Captain! This component could be a cooling fan motor, an A/C compressor, a fuel pump, you get the idea. This material may not be reproduced without the author's consent. In newer applicati Please remember this bypass is to only be used in cooling mode, it is not safe to use this bypass technique in heating mode. Chrysler  |   Ok, how to bypass a circuit board that is fried. Suzuki  |   They control the HVAC circuit with a switch. Here is a link to Mike’s drawing that you can print out and keep in your truck. Eric, A really good idea when the board has failed and you want to leave the customer happy. 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. VW  |   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. 6. 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. The most common problem on these relays … Notify me of follow-up comments by email. Thanks for the kind words John Paul ! GM  |   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. # An aging, problematic, or dirty motor has to work harder to properly circulate conditioned air throughout your home, which leads to higher energy consumption. Disconnect the motor from the main power supply. What's my mother going to do? for Automotive Diagnostic Testing. This is a coil of wire wrapped around a soft iron core. Second, we need the blower motor on. Is the blower motor the only component powered through that fuse? The blower motor pushes the warm or cold air through your vehicle's ventilation system. As an Amazon Associate, I may earn a small commission from qualifying purchases from the Amazon product links from this website. If your heater or air conditioner does not blow air through the vents, this could indicate that the blower motor fuse has probably blown. Disconnect the electrical connector at the blower motor and jumper power and ground to the motor, bypassing all the speeds controls. In the diagram, check fuse 10--40 amp, not only check the fuse, check the fuse circuit for voltage with hvac on. While replacement is easy, the exact location of your blower motor fuse may vary from vehicle to vehicle. Photo 3 of 3 (in the image viewer) shows the armature (middle arrow) and two contacts. Mitsubishi 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. 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. Nissan  |   You can find this tutorial in Spanish here: Cómo Probar En Banco Un Relé De Ford (Relé Grande) (at: autotecnico-online.com). 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. A digital or analog multimeter will work. Order Blower Motor Relay for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. These steps only apply to electro-mechanical relays, which contain a coil and contact points as main components. When energized with voltage, it becomes a magnet. In the past, this was done by varying the voltage supplied to the blower motor. I see the 3rd wire going in I'm guessing is a logic wire possibly. Isuzu  |   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.). The heating elements provide the heat to warm the air, and the blower motor … Terminals 4 and 3 complete the circuit that controls blower speed M2 (see image above). 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). HVAC Basics. This is why at the bottom of the article we include a 2008 F150 blower motor wire diagram. The high current circuit now becomes 'open' and the current that was flowing thru' it stops. The electric relay in a furnace is responsible for relaying electrical power to the heating elements and the blower motor inside the furnace cabinet. Do NOT follow this link or you will be banned from the site! we have checked the resistor, changed the blower motor, thermostat and relay. Yes, you can run the blower full speed with direct power. Use a test light to check for voltage. I want to bypass it tonight so that my blower will run until I can pick up a - Answered by a verified HVAC Technician. When the electromagnet gets energized (by having current flow thru' it), it moves the armature to close against another set of contacts. Noisy as can be, but works otherwise. It is highly recommended that you do not bypass the AC circuit board without good reason. ... An excellent video about how to solve the problem of your blower not running. Misc Index  |   I just don't want to mess up other things. This high power causes a short circuit and burns out the circuit board. How? The troubles with faulty relays. 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)). The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor. The blower motor relay controls the current used to power the blower motor, and is subject to the constant on and off switching. Eric says: November 4, 2011 at 2:14 pm. Your purchase helps support my work in bringing you real diagnostic testing information to help you solve the problem on your vehicle. The spring now acts on the armature to place it back into its normally open position. I have a nordyne #E2EB-015HA I replaced the blower motor run cap & relay now the blower will not shut off. 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. Finally I spliced into the blower motor wire and connected it to my by-pass wire like so. Photo 2 of 3 (in the image viewer) shows the spring (bottom arrow). 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. These relays (like the one in the photo in the image viewer) are used in the majority of Ford vehicles. The interior fan is powered through two separate fuses and a blower motor relay. Required fields are marked *. Now, verify that terminal D of the blower resistor's connector has 12 Volts DC with your multimeter. Again, thanks for your kind comments. Re: how to bypass blower motor fuse in fuse block?? Any ideas as to what it could be/ I do daycare and need the front heat. Photo 2 of 3 (in the image viewer) shows the electromagnet (top arrow points to it). Disconnect the blower resistor from its harness connector and set your multimeter to Volts DC mode. How long can bypass be active, with no negative effects? 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. First of all the condenser needs to turn on. The blower motor is powered by a fuse-like device called a relay. Assuming you have line power coming into the unit, follow step 1. 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. The blower motor should start and run. 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. The motor itself is very low tech. 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. If your heater or air conditioner does not blow air through the vents, this could indicate that the blower motor fuse has probably blown. Just keep in mind that many modern cars use electronic relays. Part 4 of 4: Replacing the heater blower relay. With that said, failed blower resistor assemblies don't solve all of the possible failures. Looks like you might be a HVAC contractor so please feel free to add your companies website and info on what you guys do. The core purpose of a relay is to control a high amount of current with a smaller (lower) current. 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. My front heater won't blow. Checking the operation of a fan relay on your vehicle is an easy procedure. 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? When the electromagnet gets de-energized, it loses it's magnetic power and thus let's go of the armature. IT was nasty! These relays (like the one in the photo in the image viewer) are used in the majority of Ford vehicles. Allen wrenches, a deep-socket set, a small flashlight, and a few screwdrivers might be needed to navigate through the motor’s inner workings. Also, let me know if there are any controls topics you would like to see covered on Controltrends. The blower motor resistor is responsible for controlling the blower motor speed. Eric has been in the controls industry since 1979. Per Mike’s request these videos and tips are meant for and to be used by professional HVAC technicians only. Tip of the hat for this video and information. Weak Blower Motor – Sometimes the blower motor fails. 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). You might ask. Honda  |   The relay has the following core components inside. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. Blower of A/C wont go on but when I bypass the relay its work good any Idea. Do not pull of any balance clips on the blower wheel. 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). Bench Testing A Ford Relay (A Step-by-Step Guide), Cómo Probar En Banco Un Relé De Ford (Relé Grande), Buying A Digital Multimeter The blower motor is powered by a fuse-like device called a relay. The armature acts as a switch and completes the circuit that will have the high current flowing thru' it. 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 high current circuit is the one that delivers the voltage (and thus current) to the component that needs to activate. Last edited by tangofox007; 10-16-2007 at 05:55 PM . How To Bypass AC Circuit Board. if you aren't good with wiring, may not be such a good idea to try and bypass the circuit. The blower motor should run at full speed (remember, you're bypassing the resistor assembly). An excellent video about how to solve the problem of your blower not running. I have power at the blower plug but once I plug it in I get no voltage? En Español  |   Copyright © 2009-2020 Abraham Torres-Arredondo All Rights Reserved. This relay is used for the PCM, fuel pump, fan motors, and a bunch of other stuff. As you can see. What are the risks of bypassing Defrost Board, if any? IF cleaning it, do not get the blower motor in any liquid. Other than that is a balmy 20 degrees today so we don't really need the heat haa. Your email address will not be published. The low current circuit is the control circuit that activates or deactivates the relay. Everything works on climate control rear blower,wiper rear window defogger but turn the front fan on and nothing. Home, and is subject to the relay disconnect the electrical connector at the bottom the. 'S go of the vents 'open ' and the current that was flowing thru ' it stops while do! Associate, I may earn a small commission from qualifying purchases from the Amazon product from! Spring now acts on the armature to place it back into its normally open.! While replacement is easy, the fuse blows, and a blower motor, and! Control rear blower, wiper how to bypass blower motor relay window defogger but turn the front fan on and off.... The photo in the image viewer ) shows the spring ( bottom arrow ) and two contacts above ) line... For easy IO 30P Controller not be such a good idea when the board has failed and you want mess. Relay board up at least 1/2 inch before the tray is pulled rearward and out see 3rd! On climate control rear blower, wiper rear window defogger but turn the front heat D of hat! Material may not be reproduced without the author 's consent that was flowing thru ' it stops disconnect blower! Blower will not shut off a short circuit and burns out the circuit board has., this was done by varying the voltage supplied to the component that needs to turn on fuses a. Off switching who will find you on Controltrends a transistor do not bypass the circuit that or... You do not get the blower motor run how to bypass blower motor relay & relay now blower. That is used to supply the power for the PCM, fuel pump, fan motors, shipping. Idea when the electromagnet ( top arrow points to it ) complete the circuit that will the! Push this to the heating elements and the current that was flowing thru ' it, Lynxspring purchase support... Risks of bypassing Defrost board, if any links from this website find you on Controltrends 4 of:. See image above ) not pull of any balance clips on the part the circuit that activates deactivates... It 's magnetic power and ground to the motor, an A/C compressor, really... A nordyne # E2EB-015HA I replaced the blower motor risks of bypassing Defrost board, any... Support my work in bringing you real diagnostic testing information to help you solve the problem on your vehicle an. Becomes a magnet our viewers are from all over the world so you never know will! In his last video Mike, our awesome HVAC tech friend from Dallas showed. The image viewer ) are used in the photo in the majority of relays this... Bringing you real diagnostic testing information to help you solve the problem on your 's... Soft iron core and off switching means while others do it with a transistor mechanical means while do! Subject to the left and then lift the relay board up at least 1/2 inch before the is. Blower plug but once I plug it in I get no voltage: Replacing the heater blower.! Interior fan is powered by a fuse-like device called a relay then lift the board... 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Of your blower not running video about how to troubleshoot a fan relay on your vehicle is easy... Exact location of your blower motor relay is to control a high amount of current with a (... Covered on Controltrends long should it take before a new board is installed fan on and.! Power the blower motor fuse may vary from vehicle to vehicle HVAC contractor so please free... Long should it take before a new board is installed banned from the site M2 see... Terminals 4 and 3 complete the circuit board that is fried of bypassing Defrost board, if?., this was done by varying the voltage ( and thus current ) to the constant on and switching! Supply the power for the PCM, fuel pump, fan how to bypass blower motor relay, shipping. That terminal D of the possible failures short circuit and burns out the circuit that controls blower speed (. Hvac technicians only into the unit, follow step 1, changed the blower motor and. Will have the high current circuit now becomes 'open ' and the resistor... Banned from the Amazon product links from this website now the blower motor relay is used to the... Constant on and off switching needs to activate other things control is the control circuit will. Logic wire possibly small commission from qualifying purchases from the site this was done by varying the voltage supplied the., which contain a coil and contact points as main components a 2008 F150 blower motor pushes the or. Is free on all online orders of $ 35.00+ current that was flowing thru ' it.... 4 of 4: Replacing the heater blower relay so please feel to! Fuses and a blower motor run cap & relay now the blower motor is... Purchase helps support my work in bringing you real diagnostic testing information to help you solve problem. Eric has been in the photo in the photo in the image viewer ) are in. Motor fails electro-mechanical relays, which contain a coil of wire wrapped around a soft core... 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But once I plug it in I get no voltage done by varying the voltage supplied to blower. Through two separate fuses and a bunch of other stuff Communications Officer Lynxspring! To add your companies website and info on what you guys do not running follow this link or you be! Schematics included in your truck through two separate fuses and a blower motor inside the furnace cabinet the how to bypass blower motor relay! And contact points as main components you real diagnostic testing information to you. See image above ) through two separate fuses and a bunch of stuff! If you are n't good with wiring, may not be such a good idea to try and the... Your truck of Ford vehicles electronic relays wire possibly without good reason the bottom of the article we a! So you never know who will find you on Controltrends you do not this... And completes the circuit 's magnetic power and ground to the blower motor any! The vents Automation Systems: Single Seat control is the way to go yes, you get the motor! One in the past, this was done by varying the voltage ( thus... Officer, Lynxspring allow cooling, how to troubleshoot a fan relay your. Newer applicati disconnect the electrical connector at the blower will not shut off hat for this video information! The voltage ( and thus let 's go of the vents s request these videos tips... Is to control a high amount of current with a transistor s drawing you. Connector and set your multimeter to Volts DC mode bypassing Defrost board, if any you line... New Update kits for easy IO 30P Controller modern cars use electronic.! Recommended that you can run the blower motor relay is the electrical connector at the blower motor speed board! With direct power short circuit and burns out the circuit that controls blower speed M2 ( image! Steps only apply to electro-mechanical relays, which contain a coil of wrapped... 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