Here'* one i haven't seen before. I was sitting in the house when i heard the alarm horn (the horn that goes off when you lock the car with the remote)on my car go off, i went out to check and sure enough all my doors were unlocked. No body close to me has a Pontiac or GM vehicle with an alarm. This has happened before but i haven't gone out to check it. Has anyone else had this problem or know what causes it? My Onstar is active and i thought maybe it has something to do with their satelite. Any suggestions would be greatly appreciated.
Thanks
Deb :? :?

is there anyone in your area who has a car smilar to yours? The keyless entry transmitters might be using the same carrier waves. This would be rare, but it is definately possible..

I haven't noticed any GM vehicles around me. Mostly Chrysler Mini Vans and a older GM Mini Van. This has got me stumped. If it happened once id say a fluke, but it'* been about 4 times now. I'll have to keep track of what time of day it happens. It bugs my a$$ because there'* been some car breakins around the area and i think the only thing that stops them from hitting my car is the red light flashing on the radio.
Deb

Are we talking about an aftermarket alarm or a factory keyless entry? I do not know of any factory GM keyless entry units that honk the horn so I'll assume that it is aftermarket.

The more modern alarm systems recognize the transmitters by programming the "brain" for each transmitter code rather than programming the transmitter to operate the brain. This is to say that the transmitters have a code associated to them and the brain learns this code. Most systems will have 4 or so programming "slots" to use multiple transmitters. If you in fact to have an aftermarket system then I would reprogram the transmitter codes again, filling up all of the slots. This way, any previous stored codes will be deleted.

For instance, if your system has the capibility of learning 4 transmitters and you only have two, program them both twice.

More advanced theives have scanner type devices that are able to read your transmitter codes when you use them. Later, this code can be reproduced to disarm/unlock your vehicle. This is the reason for the newer code-hopping technology that makes the scanners useless because the transmitters send out a different code each time.

It is the original keyless entry with 2 remotes The #1 remote honks the horn when the doors are locked or unlocked, the #2 remote i have doesn't honk the horn, i think it'* the valet remote, because if i use the #2 remote to unlock the car, then start the car the radio won't come on.

Welp, that sounds like a factory system alright.

We will need additional input as I'm not as familiar with the factory systems as I am with the aftermarket systems. Sorry

My car is older but I have on occasion had my alarm go off for no apparent reason. Also, sometimes my trunk or doors seem to open mysteriously, but I finally tracked that down to the remote button being pushed when it was in my pocket with a bunch of other keys.