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Making Strange Alarm Sound In Speaker

10910 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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If one of the radios the eeprom was read on I'd suspect some kind of data corruption causing it, the output to that channel is programmable in the amp IC and it's possible the routine is looping for some reason, most of the code to run the radio resides in the flash eeprom but basic setup data is also stored in the eeprom everybody has been messing with, if you have a backup copy of the original eeprom burn it back and see what you have
 

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Another radio to try ? there have been radio issues reported with the ground problem but never one report of a noise like that, at this point process of elimination since no codes are set, the Service Stabilitrac Warning is a clue of some buss trouble---hmmmm remember reading about the differences in the comm speed and bit size as GM changed the architecture spec, white automotive is the expert and he re-writes the code to accommodate these changes when upgrading to a newer radio, so if its a newer radio this can be the cause of erratic behavior on the buss, something is initiating the sound which is developed in the radio for sure
 

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Yes, everything in the car works perfectly. No warning lights or notifications.

I noticed that my battery terminals are highly oxidized. I am going to clean them and all of the ground connections today. I also noticed that my headlights are starting to dim when I press the brake pedal. Maybe my battery is not very strong anymore, and the terminals are not getting a very good connection causing the BCM to do strange things.
A good digital meter will quickly determine the condition of your battery, cables and grounds
Battery just measure at posts when starter is on, puling coil connector will prevent start so you can lay on it and see if the battery stays up
the cables measure the voltage drop from terminal to terminal, the grounds measure terminal to other side of what it's connected to
And yes all sorts of havoc can and does happen from any of these problems, think of 15+ computers all booting up and reading out their operation code as the power sags and surges----
 
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