How Power Door Locks Work
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- Опубликовано: 28 авг 2024
- Here's how the power door locks and latch works on your car.
The door latch on a car door is responsible for keeping the door shut against the body of the car. For safety reasons, this door latch requires the movement of a handle attached through a connecting rod to open.
The door lock part of the mechanism essentially disables the connecting rods that attach to the interior and exterior handles respectively. It does this by forcing two tabs that would otherwise interlock and open the latch, out of each other's way so they miss each other when the door handle is opened, "locking" the door.
The power door lock part of the mechanism consists of a small 12V DC electric motor with a built in thermister. The thermister actuates when the door lock is overcycled to prevent it from wearing down the motor. The motor powers a small geartrain which turns a small arm. That arm moves the locking rod up and down, "locking" the door in the same fashion as manually locking it.
Most modern cars have built in electronics and sensors to sense the position of the lock and key. These switches essentially feed information to the body control unit to control things like window opening functions, alarm functions, and weather to unlock all doors if turned multiple times.
Finally, the key cylinder comprises of a toothed key that slots into a key cylinder. Inside, small tumblers on springs, conform to the shape of the key, allowing it to rotate in the barrel. These tumblers can be moved around for various key combinations, and is called "rekeying" the cylinder.
The door lock actuator in this video was taken off a 2001 Toyota Corolla.
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Haha, "Brothers homework..." , "Brothers toothbrush..." gotta love that!
Haha you caught the homework
Hey it was just lying there so I used it
Not like he'll notice it missing
LOL! Oh no ! You're a crack up! Hey , i do have a question for you as you seem to understand the operation of things pretty well. I submitted a question for you on your other actuator vid and left a lot of detail, but it must have been missed. Could you take a much appreciated moment for me? Heres what I had asked :
"Excellent video sir ! Thank you for it ! I subbed because you are so very thorough and thoughtful in your demonstration . I just found you while trying to understand this system so as to diagnose my issue on my newly acquired 2008 Mazda3 S. Perhaps, you could check my thinking for me? What's happening is that my passenger front door lock is not locking when signaled via the key fob (It moves SLIGHTLY, but doesn't lock ), so it must be locked and unlocked by hand. I'm suspecting that the actuator is failing or the cables are mechanically compromised. Along with that symptom, the alarm will immediately sound after all doors are locked manually and the KEY is used at the driver door cylinder (The only key cylinder on the doors) to activate security monitoring (Using the key and turning to the right in the driver key cylinder activates the alarm system monitoring). So, what I suspect is that the switch position indicator on the actuator may be constantly indicating that the door is in the unlock position, even when it has been manually locked, thus setting off the alarm. Does that sound feasible to you with your understanding of how this system operates? "
I really didn't understand your question but mind if you help me Instead my driver side door does not unlock from the inside watching many videos now I'm a little more knowledgeable about what's happening but still dont get it it just won't unlock from Inside but works fine if unlocked through outside unlocking and locking the door works perfectly just that when unlocked in won't open as if the rod was not pulling something to open it idk tbh
I like that you pick apart and analyze every little component. Great work!
Another missed video? Just blows me away the engineering & manufacturing just to add convenience to simply allow entering and exiting your vehicle. Modern marvel. Thank you. Just another mind bending display of the how!
Good job in ~9 min. I did not expect to get a presentation, as inclusive with so many functions. Even though you were on "rapid fire", you got all the stuff in there and in a logical order.
Thanks, short and to the point is my style
Thank you! I needed to understand where the rods connect, your video is the only one I've found that shows and explains not just where they belong but also what they do.
You get a Big Atta Boy from this 60 something 'how did I get into this mess' female. I was just replacing the broken exterior door handle and it snowballed on me.
Glad it helped
Something taken for granted takes a lot of work to invent.
Your right...no one realizes how much has gone into making something you don't see
thats why i love cars so much theyre so complex yet fascinating
Still no reason why a replacement lock needs to cost up to $1000! I can buy a new washing machine, plus a new fridge for that money.
I really like how detail you explain each part of the mechanism of the door lock. Good job!
Brother's homework
Lol 😂
That a new one 👍
Ah smart, you noticed
I think all your fans noticed that one!
next video - "I'll open this up using my brothers hands".
Or wait, maybe now there will be time for sock, as there was already underwear
One day's work summarized in to 10 mins!!
Good detailed demo.
you're a life saver
the exterior handle didn't work , i tried to miss with it and locked it twice while the door is open , i was worried how am i gonna take it to the workshop and how much will it cost
i found where the exterior handle dis-attached re-attached , works again , thank you ♥️
Consise and detailed don't usually go hand in hand but you balanced it fucking perfectly--you are the boss at what you do :)
This guy is the smartest man on earth I’m convinced
Thanks 🤓
Slick camera work in the beginning with the door opening and closing.
Haha you like that eh
Speedkar99 your videos have become a thing of beauty over the years. I love how thorough you are and quick to the point with your explanations. This is what keeps me watching the whole thing. I know we talked about this in the past, but you are really getting awesome at it. Maybe one day we’ll get to see your handsome face?
Thanks I appreciate your feedback. No I'll keep my face away from the videos for now...it would be a distraction 😉
Just ... a litle more respect for your brother! ....:))
Detailed videos at a fast pace and some (hopefully) kindhearted brother-bashing to boot? Subscribed and liked!
Haha yep gotta use what's at my disposal
I love it how you use your brother and wife's stuff. Nice explanation by the way.
Thanks
Your channel deserves millions of subscribers. Such a valuable and informative videos. I like the way you explain every thing quickly so that makes viewers never feel boring while watching. Please Keep it up and don't forget the backups (Tools) of your brother's homework, tooth brush, underwear lol 😅😂👌
I'm glad it helped. I wish to do this some other time again!
Love, love, love the tool brush as a pointer!
Speedkar99, you saved me time and money, thanks for the well done video!!! My driver door Latch and Power Lock Mechanism is identical. TIP: An auto forum I look at had an explanation as to the failure of a Lock Actuator Motor (Power Door Lock Motor). The Thermistor goes bad. Knowing how to disassemble from here, I opened the lock motor and removed the thermistor located adjacent to the brushes. I then inserted a piece of flattened 12 Ga. bare copper wire in its place (To keep the motor circuit complete). The lock motor now operates flawlessly. Just dont let your brother play with the Power Door Locks. Yes, you can open the motor at the brush end but it is not easy. It is about the only thing you did not disassemble in this video. Cost of my repair? $0. How does one flatten wire? Place a bare copper piece on a vise anvil and wallop it a few times with a hammer. Why did I not buy a $10 motor? There are several varieties with different shaft ends, plus parts for my '02 Tracker are hard to find.
Glad it helped!
THANKS for the very informative video...now get to work to fix the locker on my car
Get to it
Man this is the best and more detailed explanation I've seen on the RUclips about this topic! thanks! just subscribed
the power door locks on my 1991 Camry have a really nice loud thunk. They have never needed service! Always thought it was a solenoid for some reason.
Oh man those Camrys were over built tanks
didnt expect the toothbrush pointer.
Haha it's my trademark
"got my brother's toothbrush" 06:07 I cant breathe...
Haha
Thanks. This is helping me understand why the front right door on my 2017 elantra won’t open after you unlock the door. It will open but after pulling the handle 2 times. It always opens the second time and only does it when you unlock it. BTW: Be aware of the Hyundai warranty. Many have said is a scam. And it is looking to be true. They denied the repair because of previous body work but the repair was not even on that door. I suspect that I need to replace the door actuator mechanism.
Wow ..I’m actually waiting for this episode
I have a similar model Corolla, and got some OEM locks recently. This video helped me to understand why there’s that extra harness and the pin out needed. Thanks!
Aside: Maybe you could add Toyota or Corolla in the description so it shows up in search?
On my nearly antique Honda, my aluminum casing and cover on the lock cylinder wore out, fell out and got lost. Those ended up being almost impossible to find. I did luck up on a used lock cylinder that still had them attached I took them out and rebuilt the housing for my lock cylinder so everything still works with the same key.
Nice!
Very thorough and informative, i salute you brotha information ain't cheap and you just provided it all for free. Subscribed!
Thanks for subscribing
you explained every thing in a short time that's great
great work
Thanks
@5.35 ""I am just going to use my brothers homework here to wipe the grease off" I bet your brother was real happy with that. 😂😂👊
Very cool explanation, I was expecting some spiders inside that locking case :) and I'm waiting for your video about '' how power windows work''
Haha there were spiders in the box this thing was sitting in for the past year!
Hmm power windows... I'll need a doner car for that since this Corolla came with crank windows and I've done a video on that already
Did anyone notice that I know I saw that too but you don't have to cuss I really like the part where he dropped the cake when he was taking it out of the oven and it went all over the driver side seat
Wrong video bud?
Great detail
LOL, like the video and love the "brother's home work" in action! Thanks!
Ah ha you noticed the homework. Hey it was just sitting there and I needed to wipe!
Thank you mate, I hope your brother is fine.
You are welcome! He doesn't know so nothing will hurt him
Great video man .. You are the best
Awesome bud thanks
Very concise teardown and description. Thanks. I am curious what mechanism provides for engaging and disengaging between the door lock motor and the final drive gear. What hard to see when you popped off the gears. It seemed to be a clever design but I missed it.
That's where I've been going wrong I haven't been using my brothers homework to clean it 😂
tear dowm even the key slot 👍owsom thats called proper introduction
Thanks
clever engineering
* July 3 2018 *
summer school teacher: jimmy why is your summer school register information paper all greasy and dirty?
jimmy: my brother used it to wipe off of the mechanical oil on the lock signal contacts inside the lock activator
summer school teacher: w h a t
source: 5:35
thanks very nice job!
I need a next door neighbor like you! 🤣 We'd kick @$$ building $#!t thanks for the upload! I needed to understand the polarity for the actuator ✌🏻🤙🏻
Glad it helped
Always love how detail these videos are keep it up.👌
Thank you
Excellent
Thanks
Good explication Sir. Thank your very much!!!
Glad you learned something
"Over here we have 2 little contacts and this whole thing is covered in grease so i'm just gonna use my brother's homework here, just wipe that down." 05:31 Lmao!!
😶
My brother's homework and toothbrush...😂
I just "successfully replaced the actuator from the locking assembly in my 2000 toyota corolla.
However, my initial problems is still there. I thought it would correct, but I suspect now it's mechanical issue in the assembly...or could be the control cluster on the arm rest?
Symptoms: Door unlock manual lever doesn't "rise" all the way when I press the "unlock" switch. Also, when I grab and try to pull up on it...something keeping it down. Only way to open the door is to drop the window, and grab the outside door latch. This is sort of a random, but it occurs about 1:4 times. No issue with the other 3 doors.
I have same problem🙄
poor brother
U r good ,man. U kno ur job too well. Just stuck with 2006 axio. Lock not working from drivers side switch n dome light, clock starts afresh from 1.00 o,clock on e ery start power with dow not working.checked all fuses,not sure of relays. But believe it to be . Main source problem.
Cool, thx 4 sharing
Good video, thanks
You are welcome
Really nice video
Thanks very much, I'm looking forward to your next video too
Nice presentation, but lock design seems complex to me. It should make it electronic, not this hybrid stuff. Plastic gears that wear out in door in hard to fix areas, very bad. That is some cdrom level gears, used for a car? It's easier to just use digital module, some sensors, a backup 18650li ion battery for power and a backup wheel to rotate motor in emergency and that is it. The module will compute the allowed state transitions. It's ideal for this, as there are multiple states to track.
Superb !
I have a question.Can we remove the central locking and power locking system and just have a manual lock so that we dont get trapped even in a car fire
Yeah. Just disconnect it.
Another great and thorough teardown and explanation, thanks speedkar99.
your welcome!
Really very intelligent ideas...
Sir, my car i20 front left door sometimes lock and unlock or halfway lock or halfway unlock when operated either by driver side inner central door lock handle or using key from outside the driver side. However, all 3 other doors are ok in both cases.
Also, to be noted is that when either operated from the right left door inner lock handle or using key from its outside, this particular door operates normal lock and unlock system and all 3 others ok too.
Please really help me some suggestions. Thanks.
The actuator is getting work and needs to be replaced
speedkar99 you mean I should replace the entire actuator or can I repair or replace just only the motor within the actuator itself??
Still unable to unlock neglected 2001 Subaru Outback. Was able to remove the driver panel. Lubed everything very dirty. Graphite in the outer key tumbler. Sprayed Siliconed towards actuator. Atemped to spray
liquid wrench towards door thingy. All other doors works fine. Pulled on all the rods. Found outer handle rod holder broken. Inner lock lever won't budge. Whats next? PS Your the best light I have found down this deep dark door jungle jim jam.
pls make a video on Valve clearance adjustment...and how often must it be performed ??,,pls advice..is it very important?...thanks
Good tip thanks
super great video, Thanks
Very good video
Your welcome
Thks
Nicely explained..!!👍😇
Thanks
See if you can force the lock the turn with a screw driver by breaking the tumblers.
Haha I don't think that would be easy
You'd probably bend them
What I will admit is interesting about that car, it has power door locks but no clock and only a two speaker sound system. I have the same car, base model and all, I have the clock, four speakers, but manual everything else. Maybe that car was a special order when it was new?
Yes those we're all plug and play options.
Thank you for your reply long back. I now have a maruti ignis 1.2 petrol its central locking takes place immediately after the car reaches 15kmper hour, it can be opened and locked even with a Press of a button on the driver's side. My car doesn't have a remote. Can this also be disengaged
Yea
Remove the speed signal going to the lock module. Most cars have this programmable
Thank you sir
You are welcome
Well explained good tutorial.
You are welcome
Great explanation 👍
Thank you. Great video as usual
Your welcome
Granted the motors are a typical failure point, but the contacts use a special type of grease and it can become contaminated and then they malfunction
Where is thermistor? Thnx 4 videos btw
Built into the motor or sometimes the housing
If the door lock fails when the door is shut....how do you remove the lock for repair?
Just like this exactly
where's the anttena for the locks?
Great video! So what usually happens when one door won’t lock? Does it have something to do with those metal contacts? I can hear something clicking inside the lock but not as “loud” as the other door locks.🇸🇪
It could be the thermistor, having degraded over time/use and now being too high of a resistance to allow enough current through the motor windings. You can try 'fixing; it by tearing it apart (carefully, marking critical parts/steps to allow for proper reassembly) and wrapping the little plate (the thermistor itself) inside the back of the motor with aluminum foil, although this defeats the motor protection too, be warned (e.g. if the button is held this motor could/will burn up within seconds, but it isn't working anyway, right?) or just order a new actuator, they're usually cheap enough and probably easier/less time to install (plus new ones should come with better/longer lasting protection).
how does the car know when the lock motor is getting hot and temp disable it?
hello, sir, i'm a student, i am doing a project about car door lock, and i just bought a car door lock, i want to know the motor's working voltage and current, thanks!
12V
@@speedkar99Thanks for your reply：）
im still confuse if i put the key on the barrel, the lock actuators should work but its not. when i press toggle switches for door locks it works. what could be the problem?
Could be a setting in the body module
@@speedkar99 maybe i should replace the door control module?
Those thermistors are not there to save the motor. They are there to prevent a fire if the motor becomes short circuited by heating up and opening the circuit. The same way thermistors are used in electronic appliances that use motors, such as a coffee grinder. They are required by underwriters.
Good point
Thank you. So my Jeep's power locks are locking even with the engine on. Sometimes it locks repeatedly over and over with me not touching anything. Any clue what is causing that?
Seems like a short somewhere in wiring and not an actuator issue
great vid!!
Thanks
Super
Very interesting. Thank you.
You are welcome
Hi, I replaced motors but it works the other way around, when I lock a central lock the doors open, and when I open a central lock, the doors close, does anyone have any idea why this happens? I would love an explanation, thanks.
Maybe a short in the control unit?
I have older Mercerdes w140 S-Class it has Door Lock Problem when I tries press lock it doesn't lock, causing Fuse so I hope you understand.
Sounds like the motor had burned some coils and is shorting out
how to take it out thoug , you skip that part ! from door housing
Hey, my front passenger door lock pin stutters when lock and unlock for 3 seconds and it's too loud. And it's stuck so we cannot open the door from outside but only from inside. It's so annoying, can you please tell me what is causing the problem? Thank you for your help!
I watched this because I wanted to know if continued manual unlocking could damage the actuator.
What is the name of the White Slide Clip that the Exterior Handle Rod is connected? It basically makes that rod slide up and down. I'm trying to find a replacement but I cant seem to track down an exact name or part number for it.
What’s the best lubricant to use here? Like so I get notified if you answer. Thanks:)
nice
My driver side actuator only works when it is cooler outside. If it’s hot I have to unlock my car with my remote and then use my key to unlock from outside. Do you think my actuator motor is busted? Car in question is 2004 elantra.
Could be the motor wearing or the thermistor giving out
speedkar99 thankyou.
I am going to subscribe to your channel man, because of your humor and your language, pronunciation actually, where are you from?
Thanks for subscribing! I'm from Canada.
Basically,
The key of car do nothing to protect the car.
When the key (tumbler) were removed, you can yank on the wire to open the door.
True it's not secure
By any chance do you know why my car keeps making the beeping sound (the sound cars make when you lock and unlock them) even when I am driving it. It used to automatically lock when I turned my car on and now it won’t. It used to also unlock automatically when I’d turn off the car but now it won’t. Any ideas?
excellent :D
Thanks