Horn blows when passenger door opened.

[HeyBales]

I've had something similar happen recently. I parked the truck in my garage, placed it in park and shut it off. I got out of the driver's door, closed the driver's door, walked around to the passenger door, opened it and received two beeps from the horn upon opening the passenger door. I'd be lying if I said I didn't jump, as it was unexpected.

The two beeps occasionally happen for my driver's door. Truck is always in park, and shut off when it happens. There is no rhyme or reason for why it occasionally beeps. The process of parking, putting it in park, shutting off the vehicle, and exiting is identical every time, except every month or two, beep beep upon opening the door.

So it sees the fob in the cabin.
Do you hear the unlock-all firing off and all the doors unlocking?
Of course if the double-honk just caused the heart rate to spike the thumping in the ears - easily missed!

It must have thought the lock-all button was pushed, or the outside door handle sensor for lock-all was pushed.

Any of the methods to lock all with fob seen (or thinks it sees it inside not outside) in cabin should cause that reaction.

Even your walk around to passenger door - was fob in cabin still?
Perhaps you touched door handle sensor for lock all.
Or it thought it saw it.

These descriptions are very interesting - I always wondered how accurate receivers can be with telling if fob is in or outside cabin. Besides normal computer glitches.

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[Greg F]

I don't pay much attention to the locking/unlocking of the doors. The truck locks them around 12 mph, and unlocks them sometime after I park, but before I shut off the truck and exit the cab. When I open the driver's door, it has already unlocked, so I know it's working.

I have no reason to touch any of the buttons on the door. It's definitely not the cause, and if it was, it would have double beeped when I opened the driver's door. The key fob stays in my pocket. With push button start, there is no reason to remove it. The lock sensor was not pressed when I opened the passenger door. It would have unlocked when I grabbed the handle anyway. It must be a computer glitch, which would explain the randomness if it.

 

[HeyBales]

I don't pay much attention to the locking/unlocking of the doors. The truck locks them around 12 mph, and unlocks them sometime after I park, but before I shut off the truck and exit the cab. When I open the driver's door, it has already unlocked, so I know it's working.

I have no reason to touch any of the buttons on the door. It's definitely not the cause, and if it was, it would have double beeped when I opened the driver's door. The key fob stays in my pocket. With push button start, there is no reason to remove it. The lock sensor was not pressed when I opened the passenger door. It would have unlocked when I grabbed the handle anyway. It must be a computer glitch, which would explain the randomness if it.

Do listen for the unlock all then - because it should not do it prior to opening your door, if you have the setting to unlock all.
You could have changed it to NOT unlock all on driver door open.

And no way should it auto-unlock any doors prior to shutting off truck.
Drivers door unlocks when you pull the handle - so you won't hear anything.
All the other doors if opened before yours - should require a double-pull. Again silent.

That's what I mean by the passenger door - if it really unlocked all upon your exit, that should be audible unless radio playing which stops on door open too.
And so then a walk around with fob in pocket and correct hand placement on handle would be a LOCK request, not Unlock request, since already unlocked.
If all the other doors NOT unlocked on your exit, then it would be an unlock request.
You can visually look over and see the other handles too if you missed the sound.
But if system thought the fob was back in the cabin due to misaligned receiver seeing it leave, or close on the other side back inside - that lock request would correctly double-beep.

It would not double-beep opening driver door.
It's the attempt to lock all with fob seen in cabin that causes the double-beep.

I'm just theorizing on the what may be the cause - because if you can duplicate it such that dealer can, and it's the wrong action - they have something to investigate.
But a true glitch - eh, until it's bad enough to happen regularly, and annoyingly - won't be found.

But a misaligned receiver seeing the fob where it's not - aggravating.
And best taken care of during warranty period.
Just interesting when I've seen early vehicles doing keyless entry deal with these things.

 

[Kenv24]

Do listen for the unlock all then - because it should not do it prior to opening your door, if you have the setting to unlock all.
You could have changed it to NOT unlock all on driver door open.

And no way should it auto-unlock any doors prior to shutting off truck.
Drivers door unlocks when you pull the handle - so you won't hear anything.
All the other doors if opened before yours - should require a double-pull. Again silent.

That's what I mean by the passenger door - if it really unlocked all upon your exit, that should be audible unless radio playing which stops on door open too.
And so then a walk around with fob in pocket and correct hand placement on handle would be a LOCK request, not Unlock request, since already unlocked.
If all the other doors NOT unlocked on your exist, then it would be an unlock request.
You can visually look over and see the other handles too if you missed the sound.
But if system thought the fob was back in the cabin due to misaligned receiver seeing it leave, or close on the other side back inside - that lock request would correctly double-beep.

It would not double-beep opening driver door.
It's the attempt to lock all with fob seen in cabin that causes the double-beep.

I'm just theorizing on the what may be the cause - because if you can duplicate it such that dealer can, and it's the wrong action - they have something to investigate.
But a true glitch - eh, until it's bad enough to happen regularly, and annoyingly - won't be found.

But a misaligned receiver seeing the fob where it's not - aggravating.
And best taken care of during warranty period.
Just interesting when I've seen early vehicles doing keyless entry deal with these things.

HeyBales seems to be on something. great post ….but I can almost guarantee you that like all the other “heavy hitter issues” so far on the Maverick…. The scenario is not a glitch. It is working as designed…or ALLOWED to work per spec.

 

[BillHanna]

Just to clarify; my truck does not have push-button start, just the old-fashion key start. So the outside door handles are not the touch-to-unlock type.

 

[HeyBales]

Just to clarify; my truck does not have push-button start, just the old-fashion key start. So the outside door handles are not the touch-to-unlock type.

Correct - my posts were to who I quoted - Greg F.

 

[BillHanna]

Just happened again! Backed into my friend's driveway, put in park, took foot off of brake, passenger opened his door, and the horn beeped twice.
This truck has a mind of its own!

 

[Butterscotch]

That sounds like a classic case of your Maverick having a bit of a "security system tantrum." It’s annoying, but you aren't alone—this is a relatively common quirk with modern Ford security logic.

If the passenger pulls the handle while the door is still technically "armed" (even if the lock physically popped up), the perimeter alarm triggers.

Security tantrum is about right. I can get mine to do it at will. If you jump out the seat too quickly you get yelled at !! In my case I have my key clipped to my right belt loop and if I get out too quick even witht truck off it beeps since I've left the seat but the key "has not".

Good for a chuckle at times

 

[HeyBales]

Just happened again! Backed into my friend's driveway, put in park, took foot off of brake, passenger opened his door, and the horn beeped twice.
This truck has a mind of its own!

So truck was still On, Running?

I'm just shocked my son hasn't jumped out before I've gotten get to Acc position or off - and we'd get this.
Not had it happen yet.

I'll have to try to remember to specifically test.

Actually, testing while in R or D, in case it's a timing problem thinking it's not in P yet.

 

[Glen Baker LLC]

Just happened again! Backed into my friend's driveway, put in park, took foot off of brake, passenger opened his door, and the horn beeped twice.
This truck has a mind of its own!

So truck was still On, Running?

I'm just shocked my son hasn't jumped out before I've gotten get to Acc position or off - and we'd get this.
Not had it happen yet.

I'll have to try to remember to specifically test.

Actually, testing while in R or D, in case it's a timing problem thinking it's not in P yet.

I just replicated the horn honking.
100% the boy hit the lock BUTTON while opening the door or pushing it open. It's VERY EASY to accidentally hit the button.

I can open the passenger door with the Maverick in gear and moving and no horn sounds.
I also replicated it in reverse. No horn.

 

[BillHanna]

I'll have to try tomorrow pushing the lock button as the door is opened.

 

[Greg F]

Do listen for the unlock all then - because it should not do it prior to opening your door, if you have the setting to unlock all.
You could have changed it to NOT unlock all on driver door open.

And no way should it auto-unlock any doors prior to shutting off truck.
Drivers door unlocks when you pull the handle - so you won't hear anything.
All the other doors if opened before yours - should require a double-pull. Again silent.

That's what I mean by the passenger door - if it really unlocked all upon your exit, that should be audible unless radio playing which stops on door open too.
And so then a walk around with fob in pocket and correct hand placement on handle would be a LOCK request, not Unlock request, since already unlocked.
If all the other doors NOT unlocked on your exit, then it would be an unlock request.
You can visually look over and see the other handles too if you missed the sound.
But if system thought the fob was back in the cabin due to misaligned receiver seeing it leave, or close on the other side back inside - that lock request would correctly double-beep.

It would not double-beep opening driver door.
It's the attempt to lock all with fob seen in cabin that causes the double-beep.

I'm just theorizing on the what may be the cause - because if you can duplicate it such that dealer can, and it's the wrong action - they have something to investigate.
But a true glitch - eh, until it's bad enough to happen regularly, and annoyingly - won't be found.

But a misaligned receiver seeing the fob where it's not - aggravating.
And best taken care of during warranty period.
Just interesting when I've seen early vehicles doing keyless entry deal with these things.

I haven't changed any of the lock settings. All the door locks unlock when the engine is shut off. When I carry a passenger, she often will open the passenger door prior to me opening the driver's door. When this happens, I've never had the double beep. If she had to do a double-pull, I'd hear about it, so I know that's not happening.

Trying to duplicate the issue is a challenge. In my opinion when it has occurred for the driver's door, I have done nothing different from every other time I exited the vehicle. I guess it's possible I hit the lock button, but I don't think so. If I remember, I'll try it the next time I drive the truck.

 

[HeyBales]

I haven't changed any of the lock settings. All the door locks unlock when the engine is shut off. When I carry a passenger, she often will open the passenger door prior to me opening the driver's door. When this happens, I've never had the double beep. If she had to do a double-pull, I'd hear about it, so I know that's not happening.

Trying to duplicate the issue is a challenge. In my opinion when it has occurred for the driver's door, I have done nothing different from every other time I exited the vehicle. I guess it's possible I hit the lock button, but I don't think so. If I remember, I'll try it the next time I drive the truck.

Then you do have a glitchy problem - that's not the way it's supposed to operate.
So who knows what other glitches are happening, or could happen.
I'd get it checked out under warranty - easy to duplicate for them.
You could also power-cycle all the computers with a battery disconnect for a few minutes - find in your manual instructions on doing disconnect correctly.

WHAT IS AUTOUNLOCK

Autounlock is a feature that centrally unlocks the vehicle doors when your vehicle comes to a stop and you open the driver door using the interior door handle.

AUTOUNLOCK REQUIREMENTS

Autounlock only works if all the preconditions are met:

1. The vehicle speed exceeds 12 mph (20 km/h).
2. Your vehicle comes to a stop.
3. You open the driver door.

Note: Autounlock operates for only 10 minutes after the ignition is switched off.


And I was wrong about passenger door - only rear doors.

OPENING THE DOORS FROM INSIDE YOUR VEHICLE
Pull the interior door handle twice to unlock and open a rear door. The first pull unlocks the door and the second pull opens the door.

 

[BillHanna]

100% the boy hit the lock BUTTON while opening the door or pushing it open. It's VERY EASY to accidentally hit the button.

Yep; I think mystery solved. If you open the door, then hit the lock button (just in front of the door handle), the horn will beep twice.

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