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Horn, Security System?

Tiny
AHARTLEY
  • MEMBER
  • 1999 BUICK LESABRE
  • 3.8L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
The horn went off or no reason. It burnt the fuse out, the fuse in the passenger side fuse box.
I really don't know the mileage of this vehicle. The engine has been replaced, the odometer doesn't work, nor the trip meter
I've just bough the car, it runs like a champ. I really don't know the mileage.
Horn issue.
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Monday, September 13th, 2021 AT 7:16 PM

5 Replies

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

Try resetting the security system.
Just disconnect the negative battery cable and wait 60 seconds before connecting again. This should reset the alarm system.
Please keep in mind that this will only work if the alarm system is factory equipped.
If it does not reset but the alarm is factory equipped then you might have a faulty alarm module or an issue with the ignition switch.

Here is a helpful article:

https://www.2carpros.com/articles/how-to-reset-a-security-system

Please let me know of any questions.
Thank you.
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Monday, September 13th, 2021 AT 9:50 PM
Tiny
AHARTLEY
  • MEMBER
  • 113 POSTS
I will try this and get back with you. I had had the battery unhooked overnight after I'd bought the car. I will try this again. :-)
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Monday, September 13th, 2021 AT 11:21 PM
Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Sounds good. Let me know the outcome.
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Tuesday, September 14th, 2021 AT 7:29 AM
Tiny
AHARTLEY
  • MEMBER
  • 113 POSTS
I had disconnected the negative battery cable, it was for longer than 60 seconds. I went to hook it back up and as I was trying to put the screw back in the horn was going off so I went to the fuse box, took the fuse out, and reconnected the battery. I went to put the fuse back in and the horn went off so I left the fuse out. At this point it is still out. The car will start and run, that wasn't a problem anyway, just the horn.
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Tuesday, September 14th, 2021 AT 7:06 PM
Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
It could be a shorted wire in the alarm module that is triggering the horn to be active all the time. Checking the wiring would be the next step. I have attached the anti-theft wiring schematics below.
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Tuesday, September 14th, 2021 AT 9:34 PM

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