Can a cell phone set off a car alarm?
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Posted by DanK on May 22, 2006, 8:50 am
Please log in for more thread options We have a 2004 Toyota with a factory installed car alarm. The alarm goes off randomly. Sometimes a few times a day, some days not at all. No physical disturbance is setting it off (it does it even sitting in our closed garage). However, we noticed that it seems to happen when my daughter's cell phone is in the car. I am still trying to confirm this relationship (by having the phone in there, or not having it in there, and seeing when the alarm goes off). Could the cell phone be setting off the alarm? It's nothing obvious, like the phone being on "vibrate" mode, and receiving a call. Could the phone be sending a radio signal that is at a frequency that sets off the alarm (like the frequency of the emergency button on the key pad)? We had it at the Toyota dealer, but they didn't find anything (this was before I made the cellphone connection). Thanks for any help! DanK | ||||
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Posted by martin griffith on May 22, 2006, 9:06 am
Please log in for more thread options On 22 May 2006 05:50:27 -0700, in sci.electronics.design "DanK" equipped to do EMC testing. Phones do send out a "call home" signal periodically which could be affecting the alarm. A phone will increase the strength of its transmit signal, in badly covered areas so it can be received by the network.Possibly increasing the chance of interfering with the car alarm. A bad case is here: http://news.bbc.co.uk/1/hi/england/norfolk/4732096.stm martin | ||||
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Posted by GregS on May 22, 2006, 10:19 am
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>We have a 2004 Toyota with a factory installed car alarm. The alarm
>goes off randomly. Sometimes a few times a day, some days not at all. >No physical disturbance is setting it off (it does it even sitting in >our closed garage). However, we noticed that it seems to happen when >my daughter's cell phone is in the car. I am still trying to confirm >this relationship (by having the phone in there, or not having it in >there, and seeing when the alarm goes off). > >Could the cell phone be setting off the alarm? It's nothing obvious, >like the phone being on "vibrate" mode, and receiving a call. Could >the phone be sending a radio signal that is at a frequency that sets >off the alarm (like the frequency of the emergency button on the key >pad)? > >We had it at the Toyota dealer, but they didn't find anything (this was >before I made the cellphone connection). To check the phone, you can buy gadgets that light up attached to the phone. You will know anytime the phone transmits. Try malls or cellphoneshop.com greg | ||||
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Posted by mc on May 22, 2006, 10:44 am
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> We have a 2004 Toyota with a factory installed car alarm. The alarm
> goes off randomly. Sometimes a few times a day, some days not at all. > No physical disturbance is setting it off (it does it even sitting in > our closed garage). However, we noticed that it seems to happen when > my daughter's cell phone is in the car. I am still trying to confirm > this relationship (by having the phone in there, or not having it in > there, and seeing when the alarm goes off). > > Could the cell phone be setting off the alarm? Yes. Cell phones periodically transmit their location to the tower even when you're not using them, so the tower will know where they are. Some audio systems and radios will also pick up noise from the cell phone when it's doing this. You may be able to use a radio as an indication of when it's doing it. | ||||
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Posted by René on May 22, 2006, 11:24 am
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>We have a 2004 Toyota with a factory installed car alarm. The alarm
>goes off randomly. Sometimes a few times a day, some days not at all. >No physical disturbance is setting it off (it does it even sitting in >our closed garage). However, we noticed that it seems to happen when >my daughter's cell phone is in the car. I am still trying to confirm >this relationship (by having the phone in there, or not having it in >there, and seeing when the alarm goes off). > >Could the cell phone be setting off the alarm? It's nothing obvious, >like the phone being on "vibrate" mode, and receiving a call. Could >the phone be sending a radio signal that is at a frequency that sets >off the alarm (like the frequency of the emergency button on the key >pad)? > >We had it at the Toyota dealer, but they didn't find anything (this was >before I made the cellphone connection). > >Thanks for any help! > >DanK Call the phone in the car - see if the alarm goes off. Field strengths of a GSM at full power in a semi-closed metal cabinet may be > 10V/m.
-- - René | ||||
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>goes off randomly. Sometimes a few times a day, some days not at all.
>No physical disturbance is setting it off (it does it even sitting in
>our closed garage). However, we noticed that it seems to happen when
>my daughter's cell phone is in the car. I am still trying to confirm
>this relationship (by having the phone in there, or not having it in
>there, and seeing when the alarm goes off).
>
>Could the cell phone be setting off the alarm? It's nothing obvious,
>like the phone being on "vibrate" mode, and receiving a call. Could
>the phone be sending a radio signal that is at a frequency that sets
>off the alarm (like the frequency of the emergency button on the key
>pad)?
>
>We had it at the Toyota dealer, but they didn't find anything (this was
>before I made the cellphone connection).
>
>Thanks for any help!
>
>DanK