Re: Can car alarm be set off by cell phone?

["Jim" <alarminex@xxxxxxx>]

DanK wrote:
> 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

Four or five years ago, I had to move a smoke detector out of a
business conference room. Every time someone would use a cell phone in
the room, it would set off the fire alarm.

At my office. When I'm using the office phone (land line) and my office
assistants cell phone is going to get a call ( a few seconds before her
cell phone rings) I hear strong clicking on the desk handset. Seems
like it might be able to cause a problem with a sensitive circuit in a
car alarm.