I have a 2003 IS300 and got my windshield replaced yesterday. It's the 2nd time I've had it replaced. I drove the car home, no problem. I locked the doors and about 15 minutes later, the hazards automatically turned on. I went to turn the car on, and the signals both flashed in the dash, the car turned on, and the hazards turned off. I turned the car off, and locked the doors, and the hazards came back on again. I ended up having to unplug the battery overnight, since they wouldn't turn off.

Can anyone help with this?

 

That is very weird. I would just take it back to the place that replaced your windshield.