Started happening randomly yesterday. The door was locked (I'm not sure how it got locked), I unlocked it with the key, and as soon as I opened the door, the alarm started going crazy.
I believe it is an aftermarket alarm, because it wasn't just the horn that was going off, but a much louder alarm noise. There is also some sort of sensor/antenna thing on the inside of the windshield that says "hx" on it. No clue what it is, since I bought the car used.
I ended up disconnecting the battery to make the car shut up. I tried the whole reconnect the battery, turn the key to on, and wait 30 seconds thing, but that didn't do anything. The alarm randomly stopped, then started again after ~10 seconds.
Possible variables: the hood was open when I unlocked the door initially, I had the key w/remote in my pocket, doors may have been locked from the interior (honestly no clue how they got locked).
What can I try next?
I believe it is an aftermarket alarm, because it wasn't just the horn that was going off, but a much louder alarm noise. There is also some sort of sensor/antenna thing on the inside of the windshield that says "hx" on it. No clue what it is, since I bought the car used.
I ended up disconnecting the battery to make the car shut up. I tried the whole reconnect the battery, turn the key to on, and wait 30 seconds thing, but that didn't do anything. The alarm randomly stopped, then started again after ~10 seconds.
Possible variables: the hood was open when I unlocked the door initially, I had the key w/remote in my pocket, doors may have been locked from the interior (honestly no clue how they got locked).
What can I try next?