Strange horn beeping

I didn't hear a horn beeping in your video, but you bought a car that apparently had some serious front end damage, so I wish you good luck in hammering (not literally ) out any and all problems.

 

The flashing red lock on the dash when the car is off is normal.

Are all the doors fitting correctly? Sounds like the alarm is going off, but it could be because the car has been involved in an accident serious enough to fire the airbags and the management system needs resetting? I'm only guessing.

Just listened to your video. That doesn't sound like the horn to me. Sounds like a broken pump or compressor. Is it the a/c?

 

Good luck. Any collision severe enough to trigger 3 airbags isn't "minor", or little.

Make sure the 2 coolant loops, engine and inverter, are intact, without any damage or leaks before trying to operate the car.

 

I can tell you from experience that almost every time I've seen a horn issue like this, it's been a stuck horn switch/button in the steering wheel. There's an outside chance that the relay is stuck, but 95% it's the horn switch.

The sound you hear is that of a damaged horn with constant power. Either it was physically damaged in the accident, or it was damaged from constantly being on following the impact. So you'll likely need new horns, but don't bother replacing until you repair the airbag/wheel, or you'll be buying again.

Venue 8 Pro 5830 ?