# Security alarm/horn going off uexpectedly **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** chevrolet, silverado1500\ **Created:** [February 2, 2012, 7:35am UTC](https://community.cartalk.com/t/security-alarm-horn-going-off-uexpectedly/70745 "2012-02-02T07:35:31Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Ino\_Mechanic](https://avatars.discourse-cdn.com/v4/letter/i/8baadc/32.png) [@Ino\_Mechanic](https://community.cartalk.com/u/Ino_Mechanic)\ **Post date:** [February 2, 2012, 7:35am UTC](https://community.cartalk.com/t/security-alarm-horn-going-off-uexpectedly/70745/1 "2012-02-02T07:35:31Z")
I have a 1999 Chevy Silverado 1500 extended cab. Two nights in less than a week, my horn has went off in alarm mode. Is there another reason for this other than an attempted jimmying of the lock? I live in a decent neighborhood with lots of pole lighting. Someone told me the keyfob battery was dying but I don’t have the fob. ---
**Author:** ![edb1961](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/edb1961/32/122_2.png) [@edb1961](https://community.cartalk.com/u/edb1961)\ **Post date:** [February 2, 2012, 9:26am UTC](https://community.cartalk.com/t/security-alarm-horn-going-off-uexpectedly/70745/2 "2012-02-02T09:26:12Z")
I’ve been having problems with the alarm on my 2000 Blazer going off since a close lightning strike last year. The alarm usually goes off after it has been raining for a few hours. Here is a thread I started on the subject. [http://community.cartalk.com/discussion/2282187/battery-disconnect-switch-was-2000-blazer-going-off#Item\_9](http://community.cartalk.com/discussion/2282187/battery-disconnect-switch-was-2000-blazer-going-off#Item_9) I lock the door using the key fob or the power door lock switch, then I unlock/lock the driver’s side door using the keys to disable the alarm. The alarm has not gone off since I started following this procedure. Ed B.