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2001 Pontiac Bonneville Repair Question


Topics covered: Horn, Fuse, Blown fuse.
Mileage: 385,000 miles.

Asked on April 3, 2012

Do i need a new horn?

My horn quit a yr. ago and I found the fuse under the hood was blown but upon replacing it the hoe horn makes a sick weak barely audible sound. I banged on it and some water and rust came out. I assume I need a new hor. Do you agree? And where can I get one cheap? The car has nearly 400k on it. Thanks. Mike
Avatar Asked by notapromike

Answer

Replied on April 3, 2012

get one at a parts sotore. replace the relay as well.

Roy

Tiny Answered by ASEMaster6371 (expert)
24,973 answers provided
Replied on April 4, 2012

why replace the relay? Thanks

Tiny Response from notapromike
29 questions asked
Replied on April 4, 2012

most likey the horn is the problem. if you want to check it quickley loop a test light in place of the horn and see if it takes out the fuse

Tiny Answered by djcl (expert)
788 answers provided

Replied on April 4, 2012

Horns draw very high current but there's a movable contact that breaks the circuit causing it to vibrate, so the average current isn't so high. When one of the horns gets full of water or debris, it can't turn off so effectively so the average current goes up leading to a blown fuse. That can overheat the contact in the relay. That's why replacement of the relay was recommended. The failure to vibrate properly is why it sounded sick.

There's usually two horns; a high note and a low note. Either one will cause the fuse to blow when it's shorted. You might have to sacrifice a fuse but the only way to identify which horn is shorted is to unplug one of them, install a new fuse, then see if that one horn works and the fuse doesn't blow. Most horns either sound really sick or they're nice and strong.

Horns on this car model are a fairly low failure item so you might consider a used one from a salvage yard. At the dealership I used to work at, they had factory replacements for around $30.00 each, but they pushed universal replacements for nine bucks. They worked just fine but it took a little longer to install one of the supplied mounting brackets.

Tiny Answered by caradiodoc (expert)
17,654 answers provided
Replied on April 4, 2012

Thanks to all who replied and the info to help me understand how a horn works and what my options are. notapromike

Tiny Response from notapromike
29 questions asked
Replied on April 4, 2012

Good luck

Tiny Answered by djcl (expert)
788 answers provided