Horn randomly honks once when car is parked
Joined: Apr 2005
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From: San Francisco
Horn randomly honks once when car is parked
Hi, I have a 2005 G35 Coupe 6MT with 97k miles that has been pretty trouble free. Electronics wise the car is stock except for a KP Technologies window roll up module and electronic beep module.
A few weeks ago I woke up in the middle of the night to the horn honking in the garage. When I came out I noticed the doors were locking and unlocking and the passenger window partially rolled down. The key fob was not responsive so I used the key to unlock the door and everything stopped. A few nights later a similar thing happened but this time the gas door lock was also unlocking and locking repeatedly. I unlocked the door and disconnected the negative battery terminal. The next morning I went over to my friend's shop and had him test the battery which is 2 years old and tested okay. I then removed both KP modules completely, returning the car back to stock. At this time I also checked the BCM and IPDM for signs of water, which I did not find. At this time I also programmed (via the key fob) silent mode so when I lock the doors with the fob or key the horn does not chirp. The horn also doesn't chirp when I unlock the doors.
Since that day I have not experienced any issues with the doors locking/unlocking, window rolling down, gas door locking/unlocking when parked, or the key fob not being responsive. However, the horn randomly honks once (just like when you lock the doors/alarm the alarm in non-silent mode). It usually happens early in the morning (1am-4am, again, random) and once or twice parked outside my work during the day. At work the key is far enough away from the car that the signal doesn't reach from fob to car. The horn itself works when I press the horn button on the steering wheel.
Does anyone have any idea what can be causing this or has anyone experienced something similar? Can it be a horn relay? BCM? IPDM? Alarm module? Does anyone know if the alarm module is integrated into the BCM? I read that faulty hood, doors, and trunk switches can cause the alarm to trigger but I would imagine the horn would honk more than once. Any help would greatly be appreciated. Thank you
A few weeks ago I woke up in the middle of the night to the horn honking in the garage. When I came out I noticed the doors were locking and unlocking and the passenger window partially rolled down. The key fob was not responsive so I used the key to unlock the door and everything stopped. A few nights later a similar thing happened but this time the gas door lock was also unlocking and locking repeatedly. I unlocked the door and disconnected the negative battery terminal. The next morning I went over to my friend's shop and had him test the battery which is 2 years old and tested okay. I then removed both KP modules completely, returning the car back to stock. At this time I also checked the BCM and IPDM for signs of water, which I did not find. At this time I also programmed (via the key fob) silent mode so when I lock the doors with the fob or key the horn does not chirp. The horn also doesn't chirp when I unlock the doors.
Since that day I have not experienced any issues with the doors locking/unlocking, window rolling down, gas door locking/unlocking when parked, or the key fob not being responsive. However, the horn randomly honks once (just like when you lock the doors/alarm the alarm in non-silent mode). It usually happens early in the morning (1am-4am, again, random) and once or twice parked outside my work during the day. At work the key is far enough away from the car that the signal doesn't reach from fob to car. The horn itself works when I press the horn button on the steering wheel.
Does anyone have any idea what can be causing this or has anyone experienced something similar? Can it be a horn relay? BCM? IPDM? Alarm module? Does anyone know if the alarm module is integrated into the BCM? I read that faulty hood, doors, and trunk switches can cause the alarm to trigger but I would imagine the horn would honk more than once. Any help would greatly be appreciated. Thank you
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Aug 23, 2013 10:44 AM