Car keeps locking immediately after unlocking

[a22nec]

So my car has been doing this for some years but since it didn't happen everytime I didn't care much.

So it happens like these, I'm driving and I'm going to pick someone up, I press the unlock button on the dash, the doors unlock and immediately after, they lock again, I press again the button and they stay unlocked.

But lately, it's getting more and more frequently that I have to press 3 or 4 times or even more until it stays unlocked otherwise it keeps locking right after and as you can imagine if there's cars behind you waiting for you to move it gets frustrating as the person can't get in.

Has it happened to anyone of you ?

 

[RUM4MO]

Just one question, does this only happen when you are using the internal unlock button, it works okay if you try locking the car when it is stationary using that button all the time, works okay when you unlock the car using the remote fob all the time, woks okay when you lock the car using the remote fob all the time, and works okay if you use the key in the driver's door lock barrel to lock the car all the time and works okay if you use the key in the driver's door lock barrel to unlock the car all the time?

 

[a22nec]

Yes, it only happens with the dash button when unlocking, it locks again, if I lock it doesn't unlock.

The rest works fine.

 

[RUM4MO]

It does sound like there is some "switch bounce" going on there, and I'd doubt that VW Group has included any "de-bounce" into the controller.

Maybe a bit of a guess, but why not replace that switch.

 

[a22nec]

It's a bit expensive because it has to be the entire assembly. And to be honest I'm not willing to spend that amount of money now.

Maybe I'll try to squirt some contact cleaner and see if it helps.

And I'll look about that switch bounce, never heard of it.

Thanks.

 

[RUM4MO]

Well, maybe have a look at the wiring schedule for that car and "jury rig" it to emulate that switch being operated - that might point you to the switch assembly or elsewhere.

 

[RUM4MO]

Maybe have a look the the earlier Ibiza section in this forum as someone seems to have had a similar issue and sorted it out by replacing lock modules - though you would to read through that thread and see if it had any commonality with your issue.

 

[dm222]

Almost looks like the car thinks its moving, connect you car to vcds and check if you have any error.

 

[a22nec]

Maybe have a look the the earlier Ibiza section in this forum as someone seems to have had a similar issue and sorted it out by replacing lock modules - though you would to read through that thread and see if it had any commonality with your issue.

I tried to look for that thread but didn't find it.

Almost looks like the car thinks its moving, connect you car to vcds and check if you have any error.

It doesn't have any errors.

Today happened 5 times in a row until it stayed unlocked. Frustrating.

I'm trying to remember if I did something wrong with vcds but as far as I can remember I did disable the auto lock at 15 or 20km/h so I didn't have to unlock it to get someone in because I already had that issue at the time but apart from that I don't think I messed with anything related to locking/unlocking coding. So I guess the issue was created by itself and I can't find anyone on the internet with the same problem.

 

[RUM4MO]

I'd still guess that it is due to a door lock module becoming faulty - the driver's side front door.

Does that car have remote central locking or just central locking?

 

[mjstokes85]

Had this on my MK4 Cupra, burnt out 2 convenience control modules, the issue was the alignment of the lock to the door, the car didn't recognize the door was locked, and so then tried to re-lock and unlock it over and over as it was a few mm out, just check that it is perfectly lined up, even a mm out can throw it.

 

[RUM4MO]

Had this on my MK4 Cupra, burnt out 2 convenience control modules, the issue was the alignment of the lock to the door, the car didn't recognize the door was locked, and so then tried to re-lock and unlock it over and over as it was a few mm out, just check that it is perfectly lined up, even a mm out can throw it.

On that idea, try opening the driver's door and trip the latch using a large screwdriver, the car should then assume that the door is correctly closed, then try using the interior lock and unlock, has its behaviour changed or even does it work okay now, if so that what has been said above could be the problem and if not that fault, then the door locking module needs checking out if you are practical enough to do that, otherwise replace the door module, I'd think.

 

[a22nec]

I'd still guess that it is due to a door lock module becoming faulty - the driver's side front door.

Does that car have remote central locking or just central locking?

It has remote central locking.
Why would it be the drivers door ?

Had this on my MK4 Cupra, burnt out 2 convenience control modules, the issue was the alignment of the lock to the door, the car didn't recognize the door was locked, and so then tried to re-lock and unlock it over and over as it was a few mm out, just check that it is perfectly lined up, even a mm out can throw it.

Now that you said that, my car had a hit of some sort before I bought it and the rear right door was moved and the lock thing is in a different position on the door sill, there is paint mark to where it was before. But the door closes normally with no need for additional force. But it could be that as say, I need to check if can do something about it.

On that idea, try opening the driver's door and trip the latch using a large screwdriver, the car should then assume that the door is correctly closed, then try using the interior lock and unlock, has its behaviour changed or even does it work okay now, if so that what has been said above could be the problem and if not that fault, then the door locking module needs checking out if you are practical enough to do that, otherwise replace the door module, I'd think.

Will check it tomorrow.

 

[RUM4MO]

The drivers door lock tends to be the "master", it has to be as if the remote feature fails, then you could only unlock by using the key blade in the driver's door lock. That is the/a theory, wear will normally be worse on the driver's door hinges so that is where a misaligned lock could occur without any accident damage.

 

[a22nec]

The drivers door lock tends to be the "master", it has to be as if the remote feature fails, then you could only unlock by using the key blade in the driver's door lock. That is the/a theory, wear will normally be worse on the driver's door hinges so that is where a misaligned lock could occur without any accident damage.

I just noticed that the door striker of the rear right door that was touched, it's tilted for some reason. Since I don't have the spline socket I can't align it but I guess that will be the culprit but today it worked fine seems to only happen after coming to a stop.