Wiring Diagrams Part 3 - How To Read Automotive HVAC / Blower Motor Control Wiring Diagrams
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- Опубліковано 14 жов 2020
- In part 3 of the wiring diagram series, it's time to dive into 2 slightly more difficult diagrams. This video covers manual and automatic HVAC systems found in a 2015 Hyundai Sonata but, the circuits and their operation is common across many vehicles makes and models. We also share the answer and explanation from the t-shirt question in part 2 of our diagram series. Enjoy!
Wiring Diagrams - Part 1 - • How To Read, Understan...
Wiring Diagrams - Part 2 - • Wiring Diagrams - Read...
Blower Motor Diag Video - • Use Basic Tools To Qui... - Авто та транспорт
Your lessons are reaching a lot of people who have different levels of expertise. For us DIY guys these videos are important because we don't get a lot of chances for "hands on" experience. It's nice that we can refer back to your channel to refresh our memories. Thanks Mike. Hope to see you again in the future.
Hey Wyatt, thanks for watching! Once all this Covid stuff is all done i'm sure there will be another training event that we can all meet up at, at least I hope so! :)
Mike Becker, Senior Instructor
@@GoTechTraining TST!!!
Thank you Mike for producing the series and sharing your knowledge.
Very less technicians follows the wiring diagrams like master tech, those went for trainings all the time and never get chance for technicians. This videos are enough to understand to help get the trouble shouting/ diagnose a electrical circuits thanks a lot @Mike
A wiring diagram is a roadmap to repair! Thanks for watching!
Mike Becker, Senior Instructor
I just completed my ASE A7 last week. I do not want to study anything to do with those systems, but I'll be damned if you aren't a fantastic trainer that can still make this interesting. Thanks Mike!
Hey Bobby, thanks for watching! Wow, thanks for the complement and congrats on passing A7!
Mike Becker, Senior Instructor
I appreciate receiving all of this valuable information. Thank you.👍🏾
I love being an supporter of you you are teaching a lot many people learn about your Lesson
Really appreciate what you do for us Mike. Thank you!
Hey William, really appreciate you watching!
Mike Becker, Senior Instructor
thank you for taking your time out and sharing your knowledge
Pretty simple circuits Mike and you’ve explained them very well! 👍
Hey Nick, thanks for watching! :)
Mike Becker, Senior Instructor
Honestly you're an angel. Wiring has always been my downfall with automotive. Ive rebuilt plenty of engines and a Ford 4r100. Its just nuts and bolts. Im learning wiring thanks to you. Ill apply this and help family and friends as always. 🤘
Thanks for providing a better understanding to these complex topic!
Hey Joseph, thanks for watching!
Mike Becker, Senior Instructor
Thank you Mike. I learned a lot in a short time because of your videos.
Hey Carlo, that's great to hear! Thanks for watching!
Mike Becker, Senior Instructor
I just love this kind of series. Thanks for the video.
Hey, thanks so much! Glad you are finding it useful :)
Mike Becker, Senior Instructor
@@GoTechTrainingplease help I’m new
just went through this & the colorado blower motor diag.
really worth watching both. information means power.
@Mike and all the staff @ GoTech, many thanks for sharing your invaluable knowledge.
greetings from Italy
Hey Lorenzo, thanks for watching! :)
Mike Becker, Senior Instructor
Ciao Lorenzo,,, come stai ? tutto bene ??
Excellent job of explaining why the system is in low speed right now. Quoting you, the reason is because the power has to go through 3 resistors.
Interesting video thank you for sharing these wiring diagrams video.thank you
Great series Mike. Thanks for sharing. 😊
Hey Arthur, thanks for watching!
Mike Becker, Senior Instructor
These are great, thanks Mike!
Thanks for watching!
Mike Becker, Senior Instructor
Thank You! for your videos we learn a lot!
Hey Antonio, thank you for watching!
Mike Becker, Senior Instructor
Very impressed with these videos, learning a lot please keep these videos going great explanations as well. If you have a series of videos that are just on diagrams would love to study them.
Hey Mike, thanks for watching! Stay tuned for more :)
Mike Becker, Senior Instructor
Very good info! I service / repair ride on scrubbers and sweepers and this info was a great refresher and I picked up a few things.
Glad it was helpful!
@@GoTechTraining Sweepers and Scrubbers have become quite intricate. I left automotive thinking I'd avoid it lol!
Late to the party but if everyone was either right or partly right on the tech question you must have given away a lot of tee shirts (or parts of tee shirts).😁 Thanks again for another great lesson. Between you and Eric O. it's like free automotive college !
Good teaching Mike, I'm new to this , and thank you for teaching wire diagrams 👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👌👋✌
Hey Salvador, thanks for watching!!!
Mike Becker, Senior Instructor
Great info thank you.
Thank you Mike 😊
great and helpful info
Very nice Mike. I was one step ahead of you all the way until that FET. That FET is new to me. I'll just remember it as a computer controlled variable resistor with a transistor icon. Lol.
Hey Mike, glad you were able to take something from this :)
Mike Becker, Senior Instructor
like the way you go about teaching it in detail
Thanks so much Paul!!!
~Mike
Thanks for free info maestro
Thanks for watching Ismael!
Mike Becker, Senior Instructor
Nicely done. Nice indeed!
Hey France, thanks for watching!
Mike Becker, Senior Instructor
good stuff there mike!!!
Hey Richard, thanks!!!!
Mike Becker, Senior Instructor
Nice demonstration and information 🙏💐👌👍
Hey Francis, thanks for watching!
Mike Becker, Senior Instructor
MIKE, thanks for sharing good info as always . cheeeeeers
Hey J Georges, thanks for watching! :)
Mike Becker, Senior Instructor
Keep this coming! I love this series! Thank you!
As a side note, what is the model of the Pico that you’re using?
Hey Glenn, thanks for watching! Will do, stay tuned! I'm using the PICO 4425.
Mike Becker, Senior Instructor
Thanks Mike
Thank you.
Good video 👍
Thanks for watching Ratheesh!
Mike Becker, Senior Instructor
The answer to the question wasn't what I expected. I think I answered it wrong. Im interested in your opinion of my answer pertaining to finding the prob in the system, tho, if u had time. Anyway, I cant handle too much at once so Im going out in the 25° to work on something in that truck. I think it'll be better to do the frame and body work first. I'll see the broken ground straps and a lot has to come apart b4 it goes back again. ie: the grounding is attached to panels and on spots that need replacment/fixing. I'll fix things first and then deal with electric as I go. Thank you for the vids. Great explanations.👍
You ought to have Eric O on for a special guest !
Hey Greg, that's a great idea. I'll see if he's interested!
Mike Becker, Senior Instructor
@@GoTechTraining so, what did he say
Grasias por el video
This is good for the videos
Thanks Ismael!
Mike Becker, Senior Instructor
thank you Mike great videos, what software are you using to draw on the wiring diagrams ?
Thanks Mike. This emphasizes a point I made with a DIYer I know. He feels that you should jump to the problem component and "not waste time" looking at wiring diagrams. My point is, without knowing how a circuit should operate, how do you know what you're testing? I subscribe to prodemand and use diagrams a ton. I dunno if you can share where you get your drawings from due to copyright issues but I'm always interested to learn whose diagram is who's ... the ones in this vid were great
Good job sir
Thanks Nadeem!!
Mike Becker, Senior Instructor
How do we find where each of the many modules are located in the car? Thank you for this nice series.
We need many epesodes and videos about this topic and series wiring diagram
Please make other videos
We are waiting you
Hi Mike, I just found this series on understanding electrical diagrams. You did a fabulous job of explaining how to use the diagrams. One question on the Hyundai Sonata wiring diagram, what does the number in front of the wire color mean? (Example: "1.25G" or "0.85Y") Is it the wire gauge?
Hey D Byrne, thanks for watching! Yes, i believe it's a reference to wire gauge though I'm not sure what the number/gauge value actually is though. I'm assuming this is the case because if you look at the numbers, the larger numbers are tied to the wires that carry more amperage. 3.0p on the main power feed wire, 1.2G for high speed and only .3l/0 for a signal wire.
Mike Becker, Senior Instructor
Thank you for the full informative video, let me explain my issue with Grand Cherokee 2014, the blower motor works intermittently and there is no check engine light it shut off and I can hear it spining and after minutes or so it will work again. what is your explanation? Best regards
is the thought process of blue/yellow because on non active circuits those wires can see power or ground depending if circuit is active or not?meaning like how you can read 12v and 12v on both sides of bulb on unactive circuit but active you would read 12v and close to 0v ground on the other?is this the mindset when i trace these diagrams to account for this?i hope i said this in a understandable way,i think the term is backfeeding voltage and if i dont account for this i could see ground on power side or visa versa
I like that.
At 15:38 would there be voltage at pin 3 of the a/c control module. Or a ground. Does the ground and power switch over in the switch?
That blower motor max interests me just because you have to wonder why they put it where they did. I am wondering if it has an internal ground and it is just acting as a volt meter with that being one lead. So if we are on 1, 2, 3, then you will get a certain volt meter reading. Then my parallel circuit knowledge is rusty, but switching to IV current would want to flow to the least resistance through the motor straight to ground, but I am not sure what voltage you would read at the blower motor max point. It is just interesting to see why engineers design things the way they do to get the information they want in the most efficient manner.
Hey Steve, it's intriging, right? I'm guesstimating that they want to see when the blower is on speed 4, or max because I'd bet they are ramping up the charging system them to accommodate for the additional electrical load in the system.
Mike Becker, Senior Instructor
hey mike thank you for the video, do you think you can maybe trace power windows/mirrors if you get a chance. I also have my a6 test in a month, do you have any tips?
Hey Alex, thanks for watching! For A6, make sure you study starting and charging systems. I remember there being a lot of info in there on them.
Mike Becker, Senior Instructor
@@GoTechTraining Thank you!
🍻 learning...
For sure John! :)
Mike Becker, Senior Instructor
I have a 2007 Toyota Camry and some current feedback and burn my circuit board behind my dashboard clock and it to replace.cat it be by pass?.
I wanted more on that smart resistor pull the scope is it pulse with modulated but thanks good video
Hey Trublue2319, thanks for watching! If I had that car here I would have done it. Sorry :(
Mike Becker, Senior Instructor
My thinking of the blower max signal is it's acting like a "feedback" to the A/C module from the manual control. I don't know if it's possible, but if one was to look at the A/C module with a manual control with a scan tool, the module would be able to tell what speed the fan is at by what voltage is on that max signal wire and comparing it the charging system voltage. The differences between the two would tell the A/C module what speed the switch is set to and would be displayed on the scan tool. With the fan in the off position, the " feedback" wire should show full charging voltage on it. With the speed control at hi speed, the feedback should have little voltage as most the voltage is going straight to ground. The remaining voltage is being used by the A/C module to monitor what speed the fan control is in. With the control at different speeds, the blower max signal will should show a different voltage because of the resistance in the control switch and what's being used up by the blower motor. Basically, the A/C module compares charging system voltage to what's on the blower max wire and that's how the module knows at what speed the fan control is at and displayed on the scan tool. Don't know if it's true, but that's my thought behind the blower max signal.
The blower motor being a fairly high current device, the blower max signal feedback, being sent to the A/C module, could then be relayed from the blower module thru the can bus to let the PCM know of the this load for engine management purposes. It would be easier to just monitor total vehicle system demand current demand, but heck, now you can classify a new PID, add to the data stream, specify a new fault code, etc. Why keep it simple when you can make it [more] complex? :)
Hey guys, great theory on this. I can see that being the case for sure. Why keep it simple when you can make it complex, I like that, haha! This system likely uses a computer controlled alternator...if the blowers sucking a lot of current, then it likely ramps up the charging system. That's my guesstimate.
Mike Becker, Senior Instructor
I understand the theory of using/wearing a switch verses using/wearing a module. And in theory there's no moving parts in the module so it should last the life of the vehicle. Enter vibration, heat, cold, high/low voltage swings such as from charging or battery problems, corrosion & rust and there goes the module into a non functioning part or worse. An INTERMITTENT PROBLEM! My 2020 RAV4 has that "infinite" motor speed adjustment.
With everything built for CAFE standards, I can see how monitoring the charging system output can be a contributing factor to engine load and fuel economy. The HVAC is definitely a high load.
👍👍👍
Great series ...battery ground = any ground (frame) that connects back to the battery ??
Hey Rick, thanks for watching! Ground on the battery negative will always be the best, but yes, anything on the body/frame thats metal ris usually grounded back to the battery.
Mike Becker, Senior Instructor
..so they've done away with the fuse block and replaced it with a FET but what what controls the FET? ..the AC controller? ..if it does, wouldn't it need a sensor or something? ..or is there a press button to hold down until the desired temp is set? ..maybe a hold down button would apply voltage to the gate?
Hey Doug, they've gone away with the resistor and added the FET witch is controlled by the AC module. The temp selected by the vehicle driver is an input into the AC module, which then drives the FET via supplying a varying voltage.
Mike Becker, Senior Instructor
@@GoTechTraining Thanks Mike! ..that's good to know ..I wasn't too far off
Hello, Mike. What would be the purpose of the ON and ON/START inputs in the diagram? at 13-14 minutes. Thank you for your anticipated answer.
Hello,
This states when the power in the circuit is active or hot. ON means when the key or ignition switch is in the on position, ON/Start means the circuit is powered when the key is On or in the cranking position, and Hot All The Time or BATT means the circuit is always powered regardless of where the key or ignition switch is.
Good question, thanks for reaching out!
~Ryan Wilsing
@@GoTechTraining Thank you, Ryan, for answering. What I was asking was, are these 12v inputs needed in diagnosing the blower motor? Or are they just power feeds to the HVAC module?
Ok, Looking at this particular diagram, it looks to me that the blower switch operates to a direct ground and its a manual system. So these inputs are not needed for blower function and are indeed just control module power inputs. Most likely the manufacture put them in there to show a complete diagram of the power feed system.
Thanks again for reaching out!
~Ryan Wilsing
where can I get wiring diagram books or eany specific web
Appreciate 🙏
How do the resistors slow down the speed of the blower motor if the resistors are placed after the current has already gone through the blower motor?
Hey Lake City Automotive, current is constant in a circuit :)
Mike Becker, Senior Instructor
Car stereo
Wire diagram on the back of a infinity car stereo out of a Mitsubishi motor 2002
Color diegram on the back of a infinity car stereo 2002
Car stereo
2008 Ford Fusion Manual HVAC. When engine running and Blower motor turned off, suddenly the blower erratically turns ON for a few seconds and then OFF. What could be the cause? I'm baffled. Thanx.
I'd like get link for the wirin diagram.thank you very much
Do you have an instagram or some sort of different media that you post from time to time on?
Hey Lu1s, not really. You can find me on FB, that's about the only platform I use in my free time.
Mike Becker, Senior Instructor
Tell me best software or website to get wiring diagrams
Hello Sir , can you show about other wires ? White color , black color , purple color and some other mixing colors function ?
Thanks ,
Mike thanks for putting in the time and your sharing of knowledge. Is that a pnp transistor neg on base turns on? CHEERS
Hey Anthony, thank you for watching and commenting! I'm not sure I understand your question. The source side is on the power side, making a PNP transistor. If the source was on the ground side it would be NPN.
Mike Becker, Senior Instructor
Still confused the gate(base) source(collector) drain(emitter) yes no? Just don’t understand 4 connection \
@@anthonysova7117 The gate wire (since this is an FET not a bipolar transistor it has a gate instead of a base, but I get your analogy) is the control FROM the AC control module. The drain wire at the AC control module is the feedback input TO the AC control module so the AC control module can monitor the actual voltage on the blower motor negative wire. That wire could have been tapped from anywhere on the pink wire as it is just monitoring the blower negative voltage and not flowing current.
@@BTCAutomotiveTech THANKYOU now u made clear just how the fet is used CHEERS YOU answered my question
So the FET system is not PWM?
Hey Sancte, great question! On this one, I believe it runs a variable voltage on the gate wire. I'd have to test on the vehicle to know for sure as I can't find that info within the service information. It is possible though that some manufacturers use PWM for that too. Just a different way to control voltage.
Mike Becker, Senior Instructor
I would lead to PWM also... Which would still look like a variable voltage if measured. Thanks for video!
Hey Cameron, that depends on what you're measuring with and at what freq of the PWM ;) From what I understand, the FET can't respond fast enough to a high freq PWM, so its doing the same as using some sort of variable resistor. I believe the largest benefit of PWM over VR would be current control, PWM should run cooler in theory.
Mike Becker, Senior Instructor
Hello I need help with this 😢
I don't see a indoor thermostat.
Hey Richard, oohhhh that's a great point. Different diagram ;)
Mike Becker, Senior Instructor
How to draw a schematic diagram of Convenience outlet,🙏
I could easily see wiring diagram current flow being some type of game. You get a diagram and need to show how to get the current to flow from battery to ground. What steps do you need to take to get the current to flow, and show where the current flows. Just like a maze.
Misleading: Key on engine off. You stated that is the same as run but this could be misleading. A person could conclude before given the answer that key on engine off could mean the ignition is set to Accessory. Concluding Accessory to mean on could lead to miss understanding of circuit.
I need some help maybe just little advice.
Car stereo 2002 infinity wire diagram on the back of the stereo
If the vehicle has a fuel injector shut down during misfire how do you know 🙋🏼♂️
Excellent question! Sometimes you don't. Sometimes you can see on a scan tool. Normally what I do is check for injector control, does the noid light pulse is the simplest way, if not, clear the trouble codes. See if the PCM will fire it now, even if it's just for a few seconds.
~Mike
@@GoTechTraining this has perplexed me after I watched a video on a misfire on another channel. For me being my automotive technology degree was from gateway tech in Racine Wisconsin in the 70s I jointed the military after working about 8 years as a technician. And my military training and skills where not automotive so Iam on a severe learning curve. Plus being type A+p+ gotta know type personality 🤓
@@GoTechTraining again thanks great advice 👊🏻
The drive to learn and grow is a good thing to have! Sometimes cars are the most frustrating thing in the world because they don't give you the answers you want. You have to go out and find them for yourself, with a labscope usually lol!
~Mike
@@GoTechTraining learning that too got a 2channel cheap pico for my DIY it should be good enough
👍
Go Tech Mike Becker, My Mentor
QUICK-WITTED Go Tech Mike Becker
Happy Wrenching
From Nick Ayivor from London England UK 🇬🇧 ⏰️ 22:45pm
Hey Nick! Thanks for watching!
~Mike
Now show them how a pulse with modulated blower motor works
Mike somethings toyota matrix
You're looking to study a diagram from a Toyota Matrix?
Mike Becker, Senior Instructor
I need a telescope to see the diagram
Trump 2020 👍