Horn stuck on

GOGOJUICE6

MEMBER
2000 BUICK CENTURY
3.4L
V6
2WD
AUTOMATIC
100,000 MILES

Last night, for no reason, the horn went off. (The car hasn't been driven for 2 days). Checked the horn relay and it appears to be okay.
Any suggestions? Thanks for your help.

Thursday, October 22nd, 2020 AT 4:56 PM

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,787 POSTS

Hi,

Does the horn stop if you remove the relay? I'm trying to determine if there is a short to power after the relay. Also, how was the relay inspected? Take a look at this link that explains how to test a relay:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

If the relay tests good, then I suspect the actual switch (horn button) in the column is the cause. I attached a wiring schematic of the horn circuit. Take a look and you'll see there isn't much more to fail other than a shorted wire.

Let me know about the relay and if it stops when the relay is removed.

Take care,
Joe

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Thursday, October 22nd, 2020 AT 5:16 PM

GOGOJUICE6

MEMBER
70 POSTS

Yes, it stopped once I removed the relay.(That was the only way to shut it up). This is the way I tested it: pulled it out connected jumper wire to one control terminal (85) and batt +, the other control terminal (86) to batt -, it clicked, then checked for continuity, at the power terminals (87 and 30). It had continuity.
Thx for the fast response and help.
Al.

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Thursday, October 22nd, 2020 AT 8:17 PM

GOGOJUICE6

MEMBER
70 POSTS
2000 BUICK CENTURY
3.1L
V6
2WD
AUTOMATIC
100,000 MILES

After you guys answered my original question, I went ahead and took a voltage reading at the fuse box and got live volt on the top 2 connectors, where the horn relay goes.
Is this normal?
Thanks again for your help.
Al

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Monday, October 26th, 2020 AT 11:17 AM (Merged)