Obnoxious horn at 3AM - JeepForum.com
 
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post #1 of 11 Old 09-15-2018, 12:00 PM Thread Starter
tdcolby
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Obnoxious horn at 3AM

The wife and I (and the whole neighborhood) were awakened by this wailing horn the other night. It wailed for at least 10-15 minutes then stopped. Started again moments later for a shorter duration. And then again soon after that. A few honks every now and then and eventually we got back to sleep.

After breakfast I went out to sweep the driveway and I heard that honk again. It came from MY Jeep (a 2014 JGC Limited 3.0L)! What's up with that?

It doesn't get to run much anymore since I retired unless pulling the trailer, but I try to run it once a week.

I went for a short ride to check things out - it ran well with no issues but when I returned and parked, it honked twice on its own. I jumped back in and went for a longer ride, took Tanner to the dog park for a bit and it's been quiet since then.

Any ideas? Where would I start to look for the cause?

Tom

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post #2 of 11 Old 09-15-2018, 01:26 PM
andyo5
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Like your dog, it does not appreciate being ignored and will protest loudly to get your attention.
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post #3 of 11 Old 09-15-2018, 03:01 PM
ColdCase
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Something pressing the panic button on one of the FOBs. Or a sticky button.

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Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
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post #4 of 11 Old 09-15-2018, 04:02 PM
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Quote:
Originally Posted by ColdCase View Post
Something pressing the panic button on one of the FOBs. Or a sticky button.
I've had the fob in my pocket and have somehow managed to press the panic button, I guess from moving the wrong way. When the horn went off did you try pressing the panic button on the fob to stop it?
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post #5 of 11 Old 09-15-2018, 05:27 PM
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Ours would randomly do this when the fob battery was low. A trip to the dealer confirmed that was the issue.

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post #6 of 11 Old 09-15-2018, 05:42 PM Thread Starter
tdcolby
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Both fobs were on top of the dresser so I doubt the panic button or a sticky button theory. Interesting about the low battery, I haven't seen any EVIC messages when I drove it. It hasn't recurred yet, I'll hedge my bets and change the batteries.

Thank you all.

Tom
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post #7 of 11 Old 09-16-2018, 12:01 PM
bpsmicro
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The EVIC won't be aware of the battery status of the fob. Would be nice, but not currently something it does.


If you have the keyless entry system, remember that your fob is basically transmitting almost constantly. In my experience you should expect lifetime of the fob battery of one year. And don't go cheap with the replacement.


I'd also have the actual vehicle battery tested. If it's getting weak possibly the voltage is dropping low enough to confuse the alarm system.

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post #8 of 11 Old 09-16-2018, 12:54 PM Thread Starter
tdcolby
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In the past, I've seen messages in the EVIC "Keyfob battery low" while starting but not this time. Good thought on the vehicle battery though - it has been 4+ years already on the original. It's been quiet since then.

Thank you,

Tom
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post #9 of 11 Old 09-16-2018, 01:16 PM
ColdCase
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Yes you may get a low FOB battery warning. Not all the time.

The FOB is not always transmitting, but it constantly listens for challenges. It will respond if the security software sends a request to it, which isnt that often. I've had a spare FOB sitting on the dresser for six years and it still works fine.

It seems that the experience here is the FOB can behave erratically when low on power. Sometimes confusing the Jeep into thinking its a panic.

There could be something setting off the security alarm, is the little red security indicator illuminated?

I was born with nuttin' and I still have most of it
Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
Previous: 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac
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post #10 of 11 Old 09-16-2018, 01:29 PM
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And what did your neighbors think about your GC now?
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post #11 of 11 Old 09-16-2018, 01:49 PM Thread Starter
tdcolby
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Cold case: Everything appears normal. Time will tell.

astip2: The few neighbors I talked to thought it was their own car.😂 They're all kinda jealous, being the only diesel JGC in the area.
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