Prius C :: 2012 - Horn Honking At Random Times


Aug 24, 2012

My wife was driving our 2012 Prius C that we bought new three months ago and as we were backing out of a parking space the horn sounded in a stuttering pattern. She stopped and the horn did too. As she continued to back up the horn stuttered again, this time I was watching her hands and the steering wheel. She was not touching it except in a normal driving manner. Nothing touching the center of the steering wheel. Looking over the dashboard displays we saw nothing abnormal.

As we drove out of the parking lot the horn fully sounded for a split second then stopped. We turned left onto the street and as she straightened the wheel the horn started blowing like it was in alarm mode; on-off-on-off. We pulled into a parking lot, shut off the car and the horn stopped. Drove 12 miles home with no further problem.

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My old 2005 Prius VI just did the beeping (which my neighbors and I can live with) but the addition of a honking horn, however brief, is pretty annoying. I can't seem to find a place to disable this unwanted feature...

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1. Only one key FOB and it is stable ( not in a pocket or something pushing a button)
2. Car is confirmed to be locked before this occurs.
3. No alarm issue from what I can tell ( I get up right away and no one or animal is around the car)
3. Cannot find root cause on a current thread although one person stated that it might be that the 12 VDC battery is starting to go bad???

No other issue with the car.

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Anyway, I drove the car to work and it was nice and quiet all day. (I went by the mechanic's on the way to work and had to set an appt. for Monday but I don't think I can stand it until then. This morning the honking/flashing began at 1:52 a.m. I pushed the remote. It stopped until 2:08. It kind of went like that until I finally started up the car. It is now emitting carbon and I am a zombie. What can I disable or override until a mechanic can take care of this? Is it a mechanical problem? A goofed-up sensor? Is this tied to a computer chip problem?

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Last week, 9pm, horn starts blaring solid tone. I go out and unlock door, open door, it stops. I start truck, still fine, turn truck off. Lock door, close door, starts blaring again. I reopen door, leave unlocked, close door, then get intermittent beeps. I reopen door, disconnect battery because it's late, I was going out of town, and felt bad for my neighbors. Just got back in town, too afraid to reconnect battery and not be home in case it starts going off again. I had last used the truck about 36 hours before the horn started going off, weather about 70 degrees overnight.

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