When I got to work today, I turned the car off and opened the door, and the alarm starting going off (sounds more like a mix of the horn and alarm). It finally stopped after about 5 minutes. Then when I left work for the day, I got in my car and put in the key to turn it on, and as soon as I turned it on it started going off again. Once again, it wouldn't stop for about 5 minutes. No problems turning it on or running.
Try this:
SAVE radio code and remove the negative battery cable,turn on the headlight switch for 30 seconds,turn back off,start truck.
That MAY re set the alarm relay.
The alarm system somehow got activated , this is usually because the battery becomes discharged or disconnected try doing this:
Remove the key from the ignition
disconnect the negative battery terminal
put the key back in and turn to ON
exit the truck and leave door open
reconnect the battery terminal
get in and leave door open, if the alarm horn stays off it should start.
SOURCE: 2004 toyota matrix-runs fine-near new
Thanks for choosing FixYa and welcome. You usually hear clicking when the battery or connection is bad. Since you hear nothing and you have interior power, it is not the battery, alternator, or connection. It appears to be a bad starter, starter solenoid, ignition module, or lock cylinder. Has you key been getting stuck recently? Ever? I would suggest finding your starter and hitting it. When you mess with the panic button, vibrations can trigger the starter, therfore starting the vehicle as you have said. Also, the security/alarm can cause a vehicle to not start also. But first, try hitting the starter. Do you have an alarm light on? Have you tried entering your security code? Let me know please and thanks.
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