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You may have the wires for your horn crossed with the battery wire. This would cause the horn to go off any time the battery is connected.
Your battery and alternator need attention. It sounds as if the charging is faulty and your battery has degraded.
possibly the temperature out side was cold....if it was outside or inside without heat for awhile the air bag will squeeze on the horn relay, thus maikin the horn blow when you started to charge the battery.
Horn button is a momentary switch. Yours sounds stuck. Check the contacts. Once it grounds, the horn blows & sounds grounded.
It it either a blown fuse, defective horn, bad ground, or defective horn switch. Check the fuse, if it is blown, replace, if it is good, run a wire to the horn directly from the battery. If the horn blows, suspect a bad horn switch.
Needs a new battery.
Where is the horn relay located on a 4 cylinder Toyota camry?
Hi, I had this problem on a 2000 Alero. Had to disconnect the battery to shut it up. G.M. replaced the horn relay to aleviate the problem. Duke
A palindrome for blowing a horn could be: 'toot'.
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The horn relay can be found in the fuse box under the hood. The 1990 Toyota Camry horn relay is found in slot 12 and is rated at 10 amps.
hi your horn is defective ! there could be a short but it is widely known that a horn could still honk before blowing fuse,