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Making Strange Alarm Sound In Speaker

10912 Views 32 Replies 8 Participants Last post by  ChevyGuy
Recently, my Cruze started making a strange alarm sound. It is coming out of the center dash speaker, like the door chimes do. It has happened 3 times in the past couple of weeks.

There are no lights or warnings on the dash or on the radio. I also plugged in the OBD scanner and there were no codes on the Torque app. The radio keeps playing like normal, except for the alarm sound. It is not affected by the volume knob. And it keeps playing even if the radio is off. I also disconnected the battery for a while after the second time, but the sound came back a couple days later. I also pushed the onstar button and it worked like normal, except that the alarm sounds keeps going. Everything is normal except for that sound.

The only way to get it to stop is to turn off the car, open the door to disable the RAP, but the alarm noise keeps going. After waiting about 30 seconds after the RAP turns off, the alarm stops. Then I can start the car again and the noise is gone.

Here is what it sounds like.

https://youtu.be/7dPWjassw8M

Any ideas what this could be?
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Discussion Starter · #21 ·
Update: I cleaned the oxidation off the battery terminals and a couple ground connections and I haven't had this come back yet. I will update this again if it ever comes back, but I am thinking it had something to do with the grounds similar to the negative cable problem others have had. I also probably need to start thinking about a new battery sometime soon.
 

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Discussion Starter · #22 · (Edited)
I finally figured out what was causing this noise...

This has continued happening at random intervals. Sometimes it would be a couple weeks. Sometimes it would happen twice in a week. The other day it happened while I was in the driveway, so I decided to just start unplugging things until it stopped.

The first thing I unplugged was the add a fuse for my dash cam. It was plugged into the cigarette lighter fuse in the dash fuse panel. The dash cam stays on for about 30 seconds after the car shuts off, and the noise stopped at the same time that the dash cam shut off. I decided to plug it back in, and today the noise happened again while driving. I reached down and pulled out the dash cam add a fuse, and the noise stopped at the same time that the camera shut down.

I have an E-prance Mini 0806 dash cam. It must be generating some kind of electrical noise that is being picked up by the speakers. The noise continues even after I shut off the car and turn off the RAP, so it is probably being picked up by the speaker wiring somehow.

I guess I am in the market for a new dash cam. But, at least now I know what was causing this. LOL.

I liked the Mini 0806 because it is very small, has GPS, and 135* lens, and it records super high def 1296P video at 30 F/S. It also has two micro SD card slots that can each handle up to 128GB chips. But, it is a couple years old, so maybe I can find something better now.
 

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I have an E-prance Mini 0806 dash cam. It must be generating some kind of electrical noise that is being picked up by the speakers. The noise continues even after I shut off the car and turn off the RAP, so it is probably being picked up by the speaker wiring somehow.
It would have to be pretty powerful to get picked up by the speaker wiring. I think it's more likely that it's being picked up by the FOB/TPMS receiver and activating a "undocumented feature".

Going back and listening to the sound, it's not random noise. I think it's activating something intended for the Asian market.

Question: any chance that the unit is using the car's Bluetooth to warn you about something? Perhaps a recording malfunction (corrupted SD card)?
 

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Discussion Starter · #25 ·
It would have to be pretty powerful to get picked up by the speaker wiring. I think it's more likely that it's being picked up by the FOB/TPMS receiver and activating a "undocumented feature".

Going back and listening to the sound, it's not random noise. I think it's activating something intended for the Asian market.

Question: any chance that the unit is using the car's Bluetooth to warn you about something? Perhaps a recording malfunction (corrupted SD card)?
It is possible that it is being picked up by something else. I was also thinking that maybe it is causing some kind of interference with the OnStar module. There are a few radios in that thing, and I believe it stays powered up for a few minutes. However, the radio turns off when the RAP turns off, so it's hard to see how anything in the OnStar would continue playing through the speakers. OnStar works fine when the sound is playing. I tested that once.

The dash cam doesn't have bluetooth or any wireless technology.

I am looking now to see if there is a firmware update for the camera. I also reformatted the SD card. The camera worked for a very long time without this problem, so maybe it is just getting old. I never remove it from the car, so it gets subjected to some heat.
 

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However, the radio turns off when the RAP turns off, so it's hard to see how anything in the OnStar would continue playing through the speakers.
Keep in mind the radio has power all the time - it just turns itself off when the RAP command passes though the buss. You can hit the radio's power button at anytime and it will come on.

Have you checked to see where the sound is coming from? It might have nothing to do with the car. I know looking at dashcam reviews, at least one reviewer looks for units that will warn you if there's a recording malfunction. It's kind of pointless to have a dashcam that can fail silently so that your unprotected when you think everything is OK.
 

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Looking around, that dash cam has lane departure warning and collision warning (although most say it's not very good).

I found at least one other post that someone got an alarm and error message during recording.

At this point, I think the sound is coming from the camera and just echoing off the windsheld. Note that radio off tends to silence ALL sounds from the car. So, if it's coming though with the radio off, then it's not likely to be coming from the car at all.
 

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Discussion Starter · #28 · (Edited)
Keep in mind the radio has power all the time - it just turns itself off when the RAP command passes though the buss. You can hit the radio's power button at anytime and it will come on.

Have you checked to see where the sound is coming from? It might have nothing to do with the car. I know looking at dashcam reviews, at least one reviewer looks for units that will warn you if there's a recording malfunction. It's kind of pointless to have a dashcam that can fail silently so that your unprotected when you think everything is OK.
I updated the dash cam firmware. I also noticed that the dash cam battery is not holding a very strong charge anymore. Maybe it is a low battery alarm. The recorded video looks great, and the camera recorded perfectly until I unplugged it. There were no corrupted files on the SD card, but I formatted it again anyway.

I was positive the sound was coming out of the car's speakers, but now I am not sure.
 

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Do you have an EZ Pass or one of those bags a HDD/SDD comes in when brand new? You try slipping the camera inside that and turning it on inside the car like normal? is there instructions on the camera that says 3 beeps means this 4 beeps means that esc...?
 

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Discussion Starter · #32 ·
Plugged it in again this morning after updating the firmware and reformatting the SD card. It happened again almost immediately. I stuck my head up by the dash cam and the sound is definitely coming from the dash cam. It reflects off the windshield and sounds like it is coming from the speakers when I sit in the driver's seat. I was positive it was coming from the speakers, but it is definitely coming from the dash cam. Thanks, @ChevyGuy for the recommendation to check that.

Time for a new dash cam.
 
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