Can't blow horn...blows my mind!

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theholycow
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Can't blow horn...blows my mind!

Postby theholycow » Sat Mar 18, 2017 12:53 pm

Wife's 2003 Pontiac Sunfire's horn stopped working. Press steering wheel, no honk.

2002 GMC's horn works. Swap Pontiac's horn with GMC. Both horns work on GMC. Both fail on Pontiac.

Attach test light to the two contacts on the Pontiac horn harness. Press steering wheel, test light illuminates.

Attach jumper wires to horn and battery. No honk. Try same test with GMC horn. No honk. Try both with reversed polarity, still no honk. Try all of that again at the definitely charged battery in the GMC in case the one in the Pontiac's battery is lame or I'm not getting a good connection. No honk. Disassemble one horn partially to get better contacts to connect jumper wires. No honk.

De-pin Pontiac harness horn connector. What comes out is two perfect metal slide connectors that can still be used without the plastic/rubber stuff; they will slide right on to the horn's simple solid pins. Test again with test light to be sure; still good. Try on each horn, still no honk.

Ok, so maybe these aren't traditional horns, but just dumb speakers and the PCM supplies the tone. That would explain why testing them with jumpers on the battery fails, though it wouldn't explain why the Pontiac's harness illuminates the test light. So I look it up in the OEM service manual...nope. The "Description and Operation" section seems to support it being a traditional horn that just takes plain 12v, and the diagnostic tests include my jumpers-to-battery test.

WTF. Maybe something is somehow wrong with the circuit that it can illuminate a test light, but can't move enough current to honk? What about being unable to make either horn honk by applying 12v directly to them, when I know that the horn circuit on the GMC can make both of them honk?

Maybe I'll buy a brand new horn and wire up a relay. Should a Grand Am horn play Dixie? :lol:
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Re: Can't blow horn...blows my mind!

Postby Rope-Pusher » Sat Mar 18, 2017 1:05 pm

Spontaneous deafness?
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Re: Can't blow horn...blows my mind!

Postby tankinbeans » Sun Mar 19, 2017 8:32 am

Once upon a time my aunt had a 99 Saturn SC1 whose horn failed. She took it to a dealer and they couldn't diagnose it.
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Re: Can't blow horn...blows my mind!

Postby Rope-Pusher » Sun Mar 19, 2017 9:01 am

I once heard that whore current draw can be dependent upon the pitch of the honk. Low pitch whores tended to have higher current draws.

I'm also aware that the whore is run off a relay so that the current going to the whore switch in the steering wheel could be kept small.

This makes me think that whores need good, clean connections to power AND ground if they are to honk.

Could it be that although you can measure voltage at the terminals that plug onto the whore electrical contact, that maybe the ground circuit is corroded where it attaches to the chassis and can't flow enough current to support producing a honk?
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Re: Can't blow horn...blows my mind!

Postby tankinbeans » Sun Mar 19, 2017 9:55 am

Try the button on the right, then the button on the left. Whores can be fickle and costly.
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Re: Can't blow horn...blows my mind!

Postby six » Wed Mar 22, 2017 4:10 am

Get an air horn instead.
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Re: Can't blow horn...blows my mind!

Postby Rope-Pusher » Wed Mar 22, 2017 9:20 am

six wrote:Get an air horn instead.

Don't they all work in air?
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Re: Can't blow horn...blows my mind!

Postby tankinbeans » Wed Mar 22, 2017 9:51 am

Freight train whores pretty loud and moistening.
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Re: Can't blow horn...blows my mind!

Postby theholycow » Wed Mar 22, 2017 11:13 am

Rope-Pusher wrote:Don't they all work in air?

The narwhal's horn mostly works underwater.

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Re: Can't blow horn...blows my mind!

Postby Rope-Pusher » Wed Mar 22, 2017 1:32 pm

theholycow wrote:
Rope-Pusher wrote:Don't they all work in air?

The narwhal's horn mostly works underwater.


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Re: Can't blow horn...blows my mind!

Postby potownrob » Thu Mar 23, 2017 1:43 am

Rope-Pusher wrote:
theholycow wrote:
Rope-Pusher wrote:Don't they all work in air?

The narwhal's horn mostly works underwater.

[censored]

Fickset

:shock: :o :shock: :o 8) :shock: :o :shock: :o :lol: :o :shock: :o :shock: 8) :o :shock: :o :shock:
BUT DEM FAHGLEITZ!! :shock:

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