The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor. Suzuki  |   The armature acts as a switch and completes the circuit that will have the high current flowing thru' it. In the past, this was done by varying the voltage supplied to the blower motor. Disclaimer. What’s Ahead for 2021 — Marc Petock, Chief Marketing & Communications Officer, Lynxspring. Your email address will not be published. I just don't want to mess up other things. Materials Needed. What are the risks of bypassing Defrost Board, if any? When it fails, the fuse blows, and the AC unit draws too much power. Ok, how to bypass a circuit board that is fried. Jeep  |   In the diagram, check fuse 10--40 amp, not only check the fuse, check the fuse circuit for voltage with hvac on. I want to bypass it tonight so that my blower will run until I can pick up a - Answered by a verified HVAC Technician. With that said, failed blower resistor assemblies don't solve all of the possible failures. Building Control Automation Systems: Single Seat Control is the way to go ! 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. The motor itself is very low tech. The blower motor is powered by a fuse-like device called a relay. 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. In order to get cold air, while waiting on the part. 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. 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. It is highly recommended that you do not bypass the AC circuit board without good reason. GM  |   This component could be a cooling fan motor, an A/C compressor, a fuel pump, you get the idea. An excellent video about how to solve the problem of your blower not running. In newer applicati Ford  |   The blower motor resistor is responsible for controlling the blower motor speed. ", Home  |   This high power causes a short circuit and burns out the circuit board. 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? 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. IT was nasty! Weak Blower Motor – Sometimes the blower motor fails. 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 motor from the main power supply. 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. 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. 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