I'm not sure what you mean by locking your car twice. You only need to press the button on your fob one time to lock all doors. If you press the button two times the horn will chirp, but there is no reason to press it twice.
Page 3-55 shows the default setting is the horn will not chirp when you press the fob one time.
For me I just press the power lock button on the door when getting out since my hand is next to the lock.
That's true, I do the locks on the door when I get out often also but sometimes I have visitors in the vehicle so I am not the last to get out.
I did not read that in the manual.
I guess I'm used to my old car where I had to press the lock button twice on the remote to lock the backdoors.
I thought it would be the same for the malibu, one hit of the lock button would be the front 2 seats and a second hit would be the back 2.
Thanks for the information.
But I would still like the horn disabled but I am thinking it is impossible.