I have an '09 STX.

Whether locking or unlocking via the fob...sometimes I get a friendly toot from the horn, which is what I prefer the truck always do when I lock on unlock. But, sometimes I get a longer, louder blaaaaam from the horn when I'm locking or unlocking.

Why is there a difference? And, how to I make it so it does the friendly toot all the time every time?

 

I thought the only time it honked was if you hit the lock button again after locking it already.

Unlocking? you get it honking every time?

As for the different sound, have you looked in the users manual for the '09? (it'll likely be different Vs. post 2011 vehicles due to the computer changes)

 

Maybe 09 is different since it predates the BCM controlling the horn.

 

I looked in my owner's manual. The only mentions it makes of honks is the instructions of programming new keys or fobs. That's it.

 

No mention of what it does when the transmitter battery gets low?

 

I thought about that. Sp, I proactively changed out the batteries in my fobs. Unfortunately, didn't make a difference.

I will say that the range on these key/fobss I bought off of Amazon seems to be much shorter than the OEM fobs. Maybe that's a symptom of the same problem, I dunno...

 

Only thought I had regarding the duration would be a different alert of a door is not fully closed (or the latch thinking it isn't fully closed).
On the new models, a single button push offers no noise, a 2nd push does though. The 2nd push and horn alert if nothing more than confirmation the doors have been locked.
A single press locks the doors and arms the alarm, 2nd push is often mistaken as the only way for it to arm.

As a test you could close a door to the first click, not a fully closed position and lock as usual and see if the alert a) happens or b) sounds different. Not sure if in your model year you are alerted of status like the newer models.

I don't recall any models actually honking a horn when the locks are unlocked.

 

All that.