'Splain this one car people

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NOTSMC

Well-Known Member
Got home this afternoon, got out of the car with the keys, left my son in there - he was still gathering his things together.
Car alarm went off, you know that car alarm thing that comes with the car and normally turns off with the fob, nothing I added at all. I hit the button on the fob and it wouldn't turn off. Kept pressing the button and it finally turned it off. For less than a minute. Then it went off again. I finally got it shut off again and it was off for a few minutes then it went off again. Turned it off again and it stayed off.

Minutes later I decided to go see my BF, well mostly his dog. Went out to the car, opened the door, and the alarm goes off and it won't shut off again. Finally got that to shut off but the engine won't turn over. Tried a few times, all the dummy lights are on, but the car won't turn on. Called my BF and he told me to look it up. I don't know what it's called in my 700 page book but it's not Alarm, warning or anything that would make sense. He said get out of the car, lock your door with the key, unlock it with the key and try to turn it over again.

It worked, but WTF car people? Why did that work?
 
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NOTSMC

Well-Known Member
SandieGarry said:
In my house, easy peasy explanation. A female and an electronic device. These 2 things do not ever mix well, just saying.
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SandieGarry said:
In my house, easy peasy explanation. A female and an electronic device. These 2 things do not ever mix well, just saying.
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That's what he said. Ya'll must be right, look what I did just trying to respond to you. Have no idea why your post came up twice.
 
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limblips

Well-Known Member
PREMO Member
Good chance you somehow enabled the anti-theft function in your computer. Would need to know model and year to explain it but there is a function that sets off alarm and disables the car. It sensed you had left the car and any door or window opening will trigger it when armed. In your manual look up anti-theft system.
 
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NOTSMC

Well-Known Member
limblips said:
Good chance you somehow enabled the anti-theft function in your computer. Would need to know model and year to explain it but there is a function that sets off alarm and disables the car. It sensed you had left the car and any door or window opening will trigger it when armed. In your manual look up anti-theft system.
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Thank you. It's a 2019 Hyundai Elantra. My son was still in the car and it's possible that he did something I guess. This is the first time the car alarm has ever gone off. I've locked the door before and went out to try and open the door and nothing happened. I'm not sure I understand the purpose of an anti theft alarm at all.
 
glhs837

glhs837

Power with Control
NOTSMC said:
It's a good place to start but how do you check it? It's locking/unlocking the door and trunk w/o any problem at all.
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If the Battery Plus Location doesn't have a testing capability, AutoZone or Advance Auto does. They have it built into the little display that sells the batteries. 5-7 bucks. They normally use common watch batteries. Most are also easy enough to change right at home. Some are trickier. YouTube your make and model.
 
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NOTSMC

Well-Known Member
Kyle said:
Sounds more like the pre-famulated amulite and the two spurving bearings were out of sync with the panametric fan.
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I don't think that could be it Kyle. The panametric fans started in the 2020 model. The 2019 model has an evaporator fan.
 
Kyle

Kyle

Beloved Misanthrope
PREMO Member
NOTSMC said:
I don't think that could be it Kyle. The panametric fans started in the 2020 model. The 2019 model has an evaporator fan.
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Well then, the only other thing has to be magneto-capacitive-reluctance on the part of the grammeter.

That can get expensive.
 
glhs837

glhs837

Power with Control


One thing he doesn't mention, well two if you include the fact that the CR2032 is the most common watch battery in the world and can be found in Wally and Dollar Stores even, but I do recommend using a good brand name. Sometimes the new batteries have a clear plastic film on the non printed smooth side that needs to be peeled off before installing them.

Otherwise as you can see, its a quick and easy process.
 
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NOTSMC

Well-Known Member
glhs837 said:


One thing he doesn't mention, well two if you include the fact that the CR2032 is the most common watch battery in the world and can be found in Wally and Dollar Stores even, but I do recommend using a good brand name. Sometimes the new batteries have a clear plastic film on the non printed smooth side that needs to be peeled off before installing them.

Otherwise as you can see, its a quick and easy process.
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How could it be the battery though if the car door and trunk all open immediately when I use the buttons on the fob?
 
glhs837

glhs837

Power with Control
NOTSMC said:
How could it be the battery though if the car door and trunk all open immediately when I use the buttons on the fob?
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Good point. Seems the car has a few reasons for "random" alarms that are hard to turn off.

1. There's a switch under the hood that is closed when the hood is. A rubber bumper forces it closed. Dirty, out of alingment, these things can cause the alarm to go off.
2. The fob battery being low can trigger the alarm.
3. Your 12 volt battery being low can also trigger it.

Since the fob battery is about $5 and five minutes, makes sense to start there.
 
N

NOTSMC

Well-Known Member
glhs837 said:
Good point. Seems the car has a few reasons for "random" alarms that are hard to turn off.

1. There's a switch under the hood that is closed when the hood is. A rubber bumper forces it closed. Dirty, out of alingment, these things can cause the alarm to go off.
2. The fob battery being low can trigger the alarm.
3. Your 12 volt battery being low can also trigger it.

Since the fob battery is about $5 and five minutes, makes sense to start there.
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Yes it does and I think I'll do that just in case. Thanks for the advice.
 
GregV814

GregV814

Well-Known Member
as someone stated, the anti theft system was set when the buttons the FOB were pushed. A simple solution that works to re-set the computer is to un hook the NEGATIVE cable on the battery , wait 10 seconds and reconnect.
 
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