My 93 SC stock alarm goes off for no reason. I have an after market alarm on the car that was installed 3 years ago and works fine with the car. But for no reason today the stock alarm just went off with out the AF market alarm going off so i disarm the alarm by hitting the AF market remote. First I thought it was the AF market alarm causing all the problems so i took the AF market alarm brain and just locked my doors with my key. 10 to 15 mins later it go's off again by itself. Can it be any sensors or the stock alarm brain going crazy?

 

probably a bad sensor.