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C5Z, panic alarm keeps going off.

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Old Feb 26, 2021 | 04:29 AM
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Default C5Z, panic alarm keeps going off.

Just did it at 3am. Has done it a dozen times. Alarm wasny armed or set, car was unlocked. Both fobs new batteries, hanging on a hook away from anyone. Car is on a tender with a new battery also. I may have to pull the horns if it does it again.
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Old Feb 26, 2021 | 09:42 AM
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Possibly someone in your neighborhood has a remote with a signal similiar to your C5. I had a rental car in Atlanta and every time I locked the vehicle with its remote another vehicle (BMW) alarm would go off. My rental was not a BMW.
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Old Feb 26, 2021 | 10:05 AM
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Moved to C5 Tech.
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Old Feb 26, 2021 | 10:41 AM
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Originally Posted by rrwirsi
Possibly someone in your neighborhood has a remote with a signal similiar to your C5. I had a rental car in Atlanta and every time I locked the vehicle with its remote another vehicle (BMW) alarm would go off. My rental was not a BMW.
I thought possibly that was the case but i called my handful of neighbors this morning and no-one was doing anything last night.
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Old Feb 26, 2021 | 10:56 AM
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Perhaps you have a bad horn membrane, which is a common C5 Issue, that is sounding the horn and not the alarm system? How are you shutting it off when it goes off???
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Old Feb 26, 2021 | 10:58 AM
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And you don't have to pull the horns, just removed the horn relay(s) A lot easier that pulling the horns!
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Old Feb 26, 2021 | 11:52 AM
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Mine was the bad horn membrane. But it was stuck ON, not an intermittent honking. It's funny how it always decides to go off in between the hours of 1am and 4am....LOL.

Last edited by turabo87; Feb 26, 2021 at 11:54 AM.
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Old Feb 26, 2021 | 12:31 PM
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Originally Posted by turabo87
Mine was the bad horn membrane. But it was stuck ON, not an intermittent honking. It's funny how it always decides to go off in between the hours of 1am and 4am....LOL.
Ghosts from Corvettemas past!!
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Old Feb 27, 2021 | 01:33 AM
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Originally Posted by v6turbo87
Perhaps you have a bad horn membrane, which is a common C5 Issue, that is sounding the horn and not the alarm system? How are you shutting it off when it goes off???
i hit the panic button on the fob
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Old Feb 27, 2021 | 10:46 AM
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Have you tried to put some tape over the FOB red panic button internal contact so the button can't activate it?

Last edited by Fast one; Feb 27, 2021 at 03:06 PM.
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Old Mar 1, 2021 | 10:06 AM
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My daughters Mazda6 does this, had to pull the horn fuse, alarm (horn, lights) just goes off randomly day or night, several times a week.
No idea what is causing it
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