2017~2021 Rear hatch opening by itself?
- Thread starter SndChsr
- Start date
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- Plano, Texas, USA
The best chance to get your mysterious problem fixed is to take your CX-5 to your Mazda dealer. If they can’t help you, you escalate this issue to Mazda North American Operations and create a case. Tell them it’s a safety issue and ask them to find out if there’s a solution yet with a Service Alert or Technical Service Bulletin.
I guess if those experiencing this issue have a VIN number in this range...JM3KFxxxxxx700008-820235 produced from September 13, 2019 through March 18, 2020, then that might be a factor. There's so much RF flying around though, my guess would still be something transmitting on the same frequency.
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- Plano, Texas, USA
Mazda’s remote key fob for CX-5 has FCC ID WAZSKE13D01 which uses 315 MHz. Usually this frequency is reserved by this FCC ID and the possibility of interference by other device is minimum. The control module should handle unintended signals and only take actions with legit signals transmitted by the key fob. If the unintended signals from an unknown device with 315 MHz nearby, it should trigger not only the power liftgate, but also the door locks and even the alarm. Just by this reason the culprit has to be the firmware bugs in the power liftgate control module.
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- Pueblo county CO
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- CX-5 Sport 16.5 6M
I had an aunt back in the 1980s whose garage door started opening by itself. It was very mysterious. They figured out it was jets flying overhead that used a similar frequency.
Modern garage door openers use specially coded signals and can't be opened with random radio signals. I doubt you can spring a car door (or hatch) just by using the same frequency.
Modern garage door openers use specially coded signals and can't be opened with random radio signals. I doubt you can spring a car door (or hatch) just by using the same frequency.
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- Plano, Texas, USA
Definitely you can’t just receive a 315 MHz signal and react to it. There’s a decoding algorithm built in the firmware. Software will always have some bugs and this’s a case that power liftgate control module is mishandling some unintended random 315 MHz signals and mistakenly sends a command to open the liftgate. Of course this won’t happen frequently, but only all situations come at the same time and meet the criteria.
The only other thing I can think of would be the latching mechanism not closing correctly, even though it appeared to. It would be interesting to know if those having this issue had unloaded from the cargo area and then closed the hatch, and then had this problem. It could be a latch assembly issue.
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- Plano, Texas, USA
Never! So as the trunk release (not a power lifter) on my 1998 Honda CR-V!
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- Plano, Texas, USA
Agreed. See how my Honda key fob is protecting unlock, trunk-release and panic buttons with a different shape and size too.
Davidiot
Ballistic Reentry Vehicle
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- 2020 CX-5 GT PP
I street park in a very busy area. I often can’t see my car from my house (I live above a main-street business and can’t park immediately in front) but my fob apparently can still reach my out-of-sight car. This issue hasn’t happened to me yet but it is freaking me the Hell out.
If I could disable remote hatch opening, I would do it in a heartbeat.
(I’ve never used the fob to open my hatch in the month I’ve owned the car, anyway.)
If I could disable remote hatch opening, I would do it in a heartbeat.
(I’ve never used the fob to open my hatch in the month I’ve owned the car, anyway.)
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- Canada
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- '18 CX-9 Signature
https://www.amazon.com/s?k=Faraday+Box&ref=nb_sb_noss_2&tag=m20b7-20?tag=m20b7-20
You could keep your fobs in a faraday box or bag/pouch when you're home or at work to block the fob from sending unintended signals to the car.
For users experiencing this problem, you can determine whether the problem is fob-related by placing your key fob in a faraday pouch right after you lock the vehicle. If you no longer come back to a car with the hatch open over a long enough period of time, you can safely assume that the problem is fob-related. If the hatch continues to open on it's own while the fob is secured in a faraday pouch/box, it's likely a problem with the car itself (BCM, power liftgate module) or RF cross-transmission (or possibly a latching mechanism issue as TDK1044 mentioned).
Davidiot
Ballistic Reentry Vehicle
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- 2020 CX-5 GT PP
Understood, but I haven’t experienced the problem, (yet, knock-wood), and blocking the signals altogether is not what I would want anyway.
I LOVE being able to walk up to my locked car with my keys in my pocket and just open the doors. Even better, not bothering to lock the doors as I walk away, and have the car do that (AND fold in the mirrors) automatically on its own.
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- Canada
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- '18 CX-9 Signature
I know you haven't experienced the problem yet, but you have expressed concern about the potential for this issue and expressed interest in a way to prevent it from happening.
As I said, you could keep your fobs in a faraday box or bag/pouch when you're home or at work to prevent the fob from accidentally sending signals to the car. Specifically, when you come home, instead of tossing the keys in a bowl or hanging them on a key rack, you put them in the faraday box/pouch. When you leave, you take the keys out and use them as you would normally (i.e. keep them in your pocket).
When you're at work, you'd store the keys in a faraday box/pouch in your locker/backpack/desk, and take them out before you leave. The faraday box/pouch basically eliminates user/fob error by blocking the signal sent out by the fob.
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- Plano, Texas, USA
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There’re reports and based on my own experience this auto-locking feature on the CX-5 won’t happen 100% of time which may leave us in an undesired situation with unlocked vehicle. I have to pay attention making sure I hear the first beep, otherwise I take my key fob out and lock the CX-5 “manually”.
With auto-folding mirrors, that should be easier to verify if the CX-5 is auto-locked or not.
