I have a very strange door lock issue, and what makes it difficult to assess is the issue is not always active. The doors unlock from the key fob correctly. However, if I unlock the door using the outside button on either of the handles, sometimes the doors immediately lock. Additionally, when the issue is occurring, the inner door lock switches on both the driver and passenger doors malfunction. The unlock part of the switch locks the doors and the lock part of the switch does nothing. On top of all of this, the doors will constantly try to lock. What makes evaluating this difficult is this issue does not always occur. At times I think it's resolved itself but it returns. I have turned off all the auto-lock features to rule those out as well as changing to my second key fob. Any ideas?
2024 CX-5 Door Lock Issue
- Thread starter poketape
- Start date
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- Tags
- lock malfunction
HyFlyer
2019 CX5 sig 2.2 diesel / 2016.5 CX5 touring 2.5na
- :
- Southwest Ohio
2024? Make some videos of the intermittent problem when it's happening and take it to your Mazda dealer for warranty service.
Summary:
- Key fob #1 shows no such problem.
- Key fob #2 shows no such problem.
- Door button on driver or passenger door both exhibit problem occasionally, seemingly quickly relocking after unlocking,.
Perhaps it's the manner in which you're pressing the buttons, varying slightly from one instance to the other. Say, holding the button down slightly longer sometimes, as compared to a quick "strike" on the button.
Perhaps it's both buttons being a bit sensitive, but I would think it fairly unlikely that both buttons are themselves problematic or have intermittent failures.
Your inside lock/unlock buttons seem to be reversed, is that correct? But only when this outside-button strangeness intermittently occurs?
I wonder if there is a wiring issue ... that somewhere in the circuit involving the outside door buttons and the inside switch assy there might be some wires crossed.
When the issue is happening, the doors keep attempting to lock again?
If it's a '24 and still under warranty, I'd try to document as fully as you're capable of, then present to the dealer for investigation and repair. If it's intermittent, that could be difficult from a troubleshooting standing, and a lot of dealers might want to initially charge an "investigative" (hourly) fee to explore the problem. But if it's a warranty covered thing, it ought to be tracked down and resolved. Intermittent, spurious electrical issues are bad news. Seems that there's either a wiring issue or a switch issue somewhere, if all that you describe is occurring.
That's about all I've got. Hopefully the dealer can help resolve.
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With newer, computerized vehicles, these little switches operate a little differently than you may expect. The switch sends a contact signal to the body control module, which then verifies a number of sensor conditions (for example, when you press the unlock button, the BCM checks for the presence of a signal from your key fob) and then activates the door lock/ unlock solenoid. It's as likely that there's a BCM issue as a hardware issue and a simple BCM reset may fix it. Is there a known way to execute a BCM reset for your vehicle that you can do yourself? Disconnect the battery for a minute or two for example?
Disconnecting the battery the other day seemed to fix it for a bit, but then the problem resumed, so it might have been coincidental.
Yeah, I don't think it's how I'm pressing the buttons just because I've had the car for a year and if I were to screw up pressing them, I feel like it would have happened sooner.
They're not reversed is what adds to the strangeness. The unlock part of the switch locks the car and the lock part does nothing, it's as if it hasn't been clicked at all.
That's right. And I tried today and the issue did not reappear, however the locks did creak for a bit when I first began testing locking and unlocking repeatedly to see if I could trigger the issue manually. The creaking went away, I was concerned the locks had worn themselves out but that doesn't appear to have occurred. I'm wondering if the car is left to sit off somehow the issue goes away and then it needs to be driven X minutes to reappear, in which case this'll be an awful issue to diagnose, so fingers crossed it resolved itself.
Hm.
Wondering, here ...
Perhaps water intrusion into the door panel, maybe past the window seals on the door. If that occurred, I'm uncertain to what degree (if at all) it could impact the door's actuation/locking mechanism, or even the lock switch assy inside the cabin. If a longstanding issue (the water), perhaps it could cause electrically-activated devices and contacts to go wonky. Might explain the variablity, ie, for several days following washing the car or after it rains.
Something to consider as a possibility.
It's interesting you say that because I did get a car wash maybe the day before the issue first appeared.
Doesn't surprise me, anymore, what water can do. Electrical contacts just don't like the stuff. Have had too many sub-par connectors/devices on too many vehicles have electrical issues if water gets involved. Few makers seem to engage in heavy-duty design and sealing on everything that could react poorly to water contact.
On my own CX-5, I occasionally notice that at the touchless carwash there can be a thin damp "film" on the window if within the next hour or so I open the window all the way down and then bring it back up. Got to re-do the seals on my own car, clearly. And while I'm in there I will review the whole setup for any corrosion. Am having slower operation of the driver's-side window during the colder winter months, so perhaps in the Spring I will eval the regulator and related assemblies, plus swap-in new seals.
