I have a 2002 Honda Odyssey that has recently developed an annoying habit of having its alarm go off unnecessarily.
There is no discernable pattern for when the alarm goes off - it has happened in several different locations, at different times of the day and different temperatures.
I have owned this car since 2009, but this has only become a problem a month or so ago.
I believe that the alarm is a factory-installed one and not an after-market. When it goes off it honks the horn and flashes the headlights.
I know this is not happening due to accidental actuation of the keyfob - the alarm just went off now and all I have is the physical key - the keyfob is on my wife's keychain several miles away. Having said that I did change the keyfob battery last week, but that didn't help.
The car battery should be OK. It is a nice Interstate-branded battery and is less than 2 years old, and appears to start the engine with no difficulty. (I will get the battery checked out when I get a chance though). Update - I just had the battery checked at the local parts store and apparently its fine.
I have searched google and found that a similar problem is often caused by a faulty hood-latch switch. I used these youtube instructions last night to disconnect this hood-latch switch, but the alarm still went off in the night.
What could be the cause of this and how could it be fixed?
Currently the SRS light (for airbags) is illuminated on the dashboard while the engine is running. I'm not sure how long this has been the case - normally my wife drives this car. I did get the airbag replaced under the highly-publicised recall a year ago or so.
The front bumper came off in a parking-related incident a month ago. Because this is just a daily driver/commuter vehicle we didn't bother with a new bumper, but just had the bodyshop reattach the old bumper (a bit scratched) along with the black plastic covering that goes underneath the radiator area.