2000 Buick Century Horn

RONE

MEMBER
2000 BUICK CENTURY
6 CYL
FWD
AUTOMATIC
180,000 MILES

Hi, Hope you can help me. My horn worked before I took it to get certified than when I went to get it the mechanic said he left the light on and the battery went dead and when he charged it back up the horn wouldn, t go off. He said it was the alarm but it isn, t it, s a constant loud horn sound, so I have to keep the fuse out or it blows constantly. I went to a buick dealer and he said that the plates are probaly compressed over the yrs and I tried to seperate them with no luck, is there a manual that would tell you how to do this? Also there is an airbag to contend with. I need the horn bad. Please let me know what you think, thanks Ron

1 Reply

JDL

MECHANIC
16,098 POSTS

There are trouble codes for the coil side of horn relay. You might pull the horn relay, look at the bottom, where the prongs are, are the prongs numbered, like 85 and 86-- 30 and 87. 85 and 86 are voltage and ground for the coil side of relay. By my wiring diagram, I can't tell which is which by 85 and 86, Just pull the relay, use a voltmeter, which ever is hot, the other is ground, check the ground. Use a testlite connected to battery voltage, to terminal for coil ground, if the lite comes on, you have constant ground and it shouldn't be. Yes, the problem could be in steering column. If the lite doesn't come on, then the problem isn't the ground circuit, maybe faulty relay? The horn button is part of the ground circuit.