Odd.. my truck must be a one of a kind then. It does it every time.

 

Me too..You are not alone.2006 dodge ram 1500 slt

 

Copy and paste

I found this helpful...

So, on an '06, to turn the horn on/off it's:

- Stand outside the truck
- Hold down the lock button between 4 and 10 seconds
- Press the Panic button while still holding the Lock button
- Release both buttons at the same time

 

If I use my fob key to unlock the door, the alarm goes off until I insert it into the ignition.
I have the original 2 keys, and both do the same thing. There might be a way to change this using the lock unlock buttons in a certain sequence.
2006 MegaCab