I have a 2005 STS and just this past week when exiting the vehicle and using the FOB to lock it I've noticed that the horn is very faint. The horn itself at the steering wheel is equally as faint. While I doubt this would be it, the battery in the FOB is new. I've checked the various menu settings within the NAV Console and all is well.
One of your horns might be dead.
Happens when water gets in them.
I replaced mine on the Deville I had before the STS. It got louder then. The car should have 2 horns a high and a low frequency perhaps you only have the high working.
Either it was changed from the original or I mis read it the first time also.
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