Horn not working on Buick Century Custom?

TRINITY58

MEMBER
2001 BUICK CENTURY
3.1L
6 CYL
2WD
AUTOMATIC
86,500 MILES

Somebody tried to steal my front grill one night and it set the factory alarm off. After a few hours of honking, my neighbor across the street came over @ 2am to let me know my alarm was going off. I tried to reset it with the remote, but I had to disconnect the battery to stop the horn. I checked the fuse, which was good, and swapped the horn relay with a known good relay (a/c clutch), but still the horn is not working. Got a horn off a junkyard Camaro, installed it and still no horn.

Thursday, February 26th, 2026 AT 12:00 PM

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
55,411 POSTS

Yep, it sounds like the horn ground got disconnected, while honking the horn test the ground wire for power with a test light, if power is present the ground is no good.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

The ground connection is at the upper left part of the tie bar. Also, check for power at the horn as well. This will tell us if the horn is getting power. Check out the images (below). Let us know how it goes, Ken

Image (Click to make bigger)