My Avenger (2008) has the EXACT same problem (started 2 days ago). Did you ever find the cause and fix for it?My 2013 Avenger horn is going off randomly. I have had it to the Dodge dealer and he can't find the problem.
The battery was changed in the key fob and the fuse was changed. Even with the fuse out the horn still goes off. Can anyone help? Thanks
Not very helpful, but thanks. I do hope that "tinyavenger" would respond though with an update. That would be very helpful.Like asked of the Original Poster, there are 2 ways for the horn to activate as posted. That person never responded or has been back to the Forum here. THE SAME RESPONSES GIVEN APPLY TO YOU...if you want help to come to a resolution of the problem.
It also gets rather warm out in Utah in the summer...Now that's funny... I could never get the heat hot enough in my 08 to stay reasonable warm. I can't imagine it doing damage to anything.
Here is the answer to the problem!
With the car heater on (blowing down or on Auto), the heater heats up the key, which (after many years of doing this) causes the circuitry in the key to miscommunicate with the car's security system and causes the horn to honk arbitrarily.
I took my car into Big-O (which is GREAT here in Cedar City, UT) and they tested the battery and charging system and both are working perfectly.
The cure to this problem is (according to a Dodge Dealer mechanic is):
1. Have the heater blow heat up to the windshield instead of down to the floor (this way the key won't get too hot), or
2. Start using the spare key, or
3. Go to the dealer and pay a LOT of money to have the key replaced.
I am now doing #1 and #2 and now things are working fine.
This is for the 2008 Dodge Avenger with the big engine in it.