Lock or unlock the doors they constantly keep locking?

Tiny
TONY02
  • MEMBER
  • 2012 TOYOTA COROLLA
  • 130,000 MILES
I have the car listed above that has a problem with the door locks, when I use the remote to lock or unlock the doors they constantly keep locking and unlocking even when I get inside the car they eventually stop when I start driving, this is more of an intermittent problem but it’s doing more often than usual I’ve disconnected the actuator one by one to see if that’s it but it’s not.
Sunday, August 18th, 2024 AT 7:03 PM

10 Replies

Tiny
TONY02
  • MEMBER
  • 86 POSTS
It also does it with the door lock switches on the driver and passenger side. I also took the battery out of the remote and unlocked it with the switches, but it still does the same thing.
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Sunday, August 18th, 2024 AT 7:05 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Yep, sometimes the switch inside the door latch goes bad which can cause the issue, usually the driver's side. I would start the car with the drive side window down then shut the door, with the door shut try to pull and then push on the door to see if the door locks act up. can I ask if this car has the "smart key"? The main body ECU controls the door locks which might be having an issue. We can tell for sure if you did a CAN scan. You can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

Please go over this guide and get back to us.
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Monday, August 19th, 2024 AT 9:43 AM
Tiny
TONY02
  • MEMBER
  • 86 POSTS
If smart key you mean that is has a remote to unlock the doors then yes, unfortunately I don’t have a CAN scanner just a regular OB2 scanner but I did try to pull and push on all doors but the door locks did not act up but now my door switch on both sides doesn’t want to unlock sometimes but will always allow me to lock.
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Tuesday, August 20th, 2024 AT 2:00 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Thank you, the smart key door lock system is involved. It has a body ECU and a certification module; this is why I wanted to do a CAN scan but since the switch seems to be having an issue you might want to swap it out to see what happens. I would get the switch from Amazon so you can return it if it does not make a difference.

Here is one for $35.00:

https://amzn.to/4fRoDKq

Here is how to change the master window switch out. Check out the images (below). Let us know how it goes.
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Wednesday, August 21st, 2024 AT 8:57 AM
Tiny
TONY02
  • MEMBER
  • 86 POSTS
Okay, thanks, I’ll give that a try. But just wanted to ask wouldn’t it make a difference it a disconnect and in theory it should stop the problem, wouldn’t it? Because I’ve disconnected the driver side switch, and it still does the same thing so I’m kind of believing that’s not the problem.
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Wednesday, August 21st, 2024 AT 9:16 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Okay, that is telling us the body ECU could be bad, that is why I wanted to do the CAN scan. Here is the location and how to replace it in case a code comes up for it. The only other thing I can think of is one of the latches is bad, you might want to disconnect the latches one at a time as well, I would start with the driver's door.
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Thursday, August 22nd, 2024 AT 9:16 AM
Tiny
TONY02
  • MEMBER
  • 86 POSTS
Yes, I disconnected all the actuators one at a time and I still seem to have the issues if I replace the body ECU is there any programming I have to do or just swap the parts and that’s it?
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Thursday, August 22nd, 2024 AT 1:32 PM
Tiny
KEN L
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I believe it needs to be programmed as all other cars do, you can get a preprogrammed unit by searching Google or Ebay.
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Friday, August 23rd, 2024 AT 7:13 AM
Tiny
TONY02
  • MEMBER
  • 86 POSTS
Okay, thanks I’ll look into it.
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Friday, August 23rd, 2024 AT 8:04 AM
Tiny
KEN L
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Sounds good, have a nice weekend.
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Friday, August 23rd, 2024 AT 8:55 AM

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