My 2017 CX-3 went nuts while parked - Mazda CX3 Forum
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post #1 of 5 Old 07-05-2018, 12:32 AM Thread Starter
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My 2017 CX-3 went nuts while parked

I wonder if anyone has experienced this before or may have any idea what may be going on with my car.

My 2017 Mazda CX-3, about 1.5 years old with 23,000km went nuts while it was parked in my driveway. My car was idle on the driveway for 2 days, other than moving it to let someone out. So I suspect that this behavior happened sometime on the 2nd day. At some point my Father noticed that the headlights were flickering and the front wipers were moving slowly on their own - don't know how this started and don't know how long it may have been going on up to that point. The dash was lighting up and the RPM gauge was going up and down. Could not get the car started. Pressing the horn didn't work, but when the horn was pressed all the dash lights went out. When let go the dash lights came back on after a few seconds. Also could not manage to get the windows up. While this was going on there was a clicking noise coming from a compartment beside the battery.

Disconnected the battery and was going to get a tow in to the dealer but there were no tows available until late in the night and decided to get a tow in the morning to the dealership.

Reconnected the battery again to try to attempt to at least get the windows up in case of rain/theft. Managed to get all of them up except for the driver window.

A neighbour who is a retired mechanic suggested that maybe a relay got stuck which may have caused the battery to drain. The car was able to start with a boost and let it run for a bit to charge. Was able to start it multiple times and was able to drive it to the dealer today.

The dealer had the car the entire day and was unable to find any issues. Asked about the battery since the boost was needed to start it and they said there was nothing wrong with the battery.

I came across a post here with similar symptoms, which the poster indicated was the battery:

So I have some concerns about this from my perspective:

1.) Cause not known/dealer could not find a problem. The dealer said that because the battery was disconnected the codes were cleared which may have helped for diagnosing. If it happens again they said to tow it in and let the battery drain down.
2.) Lets assume for the moment the battery somehow got low/drained - how did that happen? Note the car is 1.5 years old and its the original battery and the dealer said the battery is fine. The only thing I have plugged in to the car is a USB stick for music, and I also have a dashcam plugged in to the cigarette lighter (which is only active when the car is running).
3.) If we assume the issue was the battery being low/drained, why was the car behaving so erratically? To me, what was going on was a major malfunction.
4.) Safety issue - what if it goes nuts like this while I'm driving?

The dealer said they are going to contact Mazda to see if there have been reports of behavior like this. So I will see when the dealer follows up with me what they find.
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post #2 of 5 Old 07-05-2018, 01:19 AM
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Hi, I think you might have a loose ground at the engine, frame, fuse boxes or control modules. Here is a TSB that I came across awhile back, not sure if it applies, but worth a read.
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File Type: pdf TSB.pdf (248.1 KB, 213 views)
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post #3 of 5 Old 07-05-2018, 01:37 AM Thread Starter
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Just a minor update with some important info.

As I mentioned there was a dash cam in the cigarette lighter which should only power when running. I thought, why not check if it was actually recording? And from what i can see, it was recording for hours when parked (maybe more, it overflowed) - this explains the battery drain.

The last person who was in the car opened the windows, I suspect they may have left it in ignition mode and did not actually shut it off

With that said, is the behavior I described in my original post normal if the battery gets drained? Thanks.
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post #4 of 5 Old 07-05-2018, 01:58 AM
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GT, with rain-sensing wipers and auto-headlamps? Otherwise, here in Maine, about all we can do is consult with Stephen King ;-)

2017 CX-3 GT, AWD, i-ActiveSense, Ceramic Metallic, Black ... His: Zoom, Zoom!
2016 HR-V EX-L, AWD, Milano Red, Black ... Hers: Putt, Putt.
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post #5 of 5 Old 07-05-2018, 10:27 AM
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Originally Posted by mainemanx View Post
GT, with rain-sensing wipers and auto-headlamps? Otherwise, here in Maine, about all we can do is consult with Stephen King ;-)
Carrie was EXACTLY what I thought when reading about the flickering headlights and wipers lol!

I thought all dashcams had a shutoff feature when draining the battery too low. Mine is connected to the fuse panel for passive recording with auto shutoff but I think that you may have figured the issue with the ignition not being fully off. Hopefully it was just that and no more

2018 Mazda CX3-GS, Lux + iActiveSense Pkgs. Eternal Blue Mica.
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