When turn the key on, about half way it sounds like the horn is honking or some kind of beeb sound?
Aug 28, 2010 at 4:00 PM
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MMPRINCE4000
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Could be a seat belt warning buzzer, or SRS buzzer.
If it has never done this before, have Toyota look at in under warranty.
This will document the problem in case it comes up again after warranty is up.