Brand-new Lariat. Comes with Pre-Collision Assist w/AEB.

I’ve enabled it on the display but it doesn’t work.

Taking it to dealer but wanted to check here first.

Thanks.

 

Did you hit something?

 

Truck is under warranty.......take it in.

 

How do you know its not working? I've only had it go off 2 times, and I've tried to force it many more. I may just not be understanding the algorithms its written with. Or maybe I have a problem too?

 

Yeah that's kind of what I'm thinking. I've tried to force it several times by driving at an object and at the last second veering off to the side.

There's no indication that it's working.

When you say you had it go off what does it do? Is there a warning beep? Any lights on the dash? Did your brakes get automatically applied with enough force?

Lots of questions and I did stop by the dealer. They were about 50% helpful with only a basic understanding of the system. Told me it's on just trust it lol. The owners manual is lacking in that it doesn't provide the parameters on when the Pre-Collision system will kick in.

Thanks.

 

I had the same reaction as the OP when I first got my 2019 Expedition. It never went off for me or for the dealership service manager who test drove it and compared it to another stock Expedition. It was not until I was notified that the district Ford engineer was at my dealership that we met up and he and I took a test drive on which I finally got it to go off--I had to accelerate at a stopped semi before the alarm/light triggered, so to him it works. The only times it has gone off since are times when a car ahead is turning right and I am closing on it as it turns and sometimes it isn't even in my lane but in a right-turn lane. Usually, if you're slowing or braking, collision avoidance assumes you have identified a potential collision ahead and does not alert. That it never goes off when I would think it could (like when someone cuts into my lane), leads me to believe that it is less attentive than I am. Apparently the parameters for activation must be designed around those drivers who pay little or no attention to their driving.

It's not as big of a disappointment as the lane keeping system which reminds me of driving an old car with excessive preload on the gearbox--no road feel, minimal return to center, and it always takes way too much effort to make minor lane corrections. If you try to change lanes w/o signaling, it fights you. And, when you're in your lane and hit an imperfection in the road surface and turn the wheel slightly, it almost wrenches the steering wheel out of your grip.

 

Sounds less intrusive than the collision avoidance on my wife's Subaru Outback, I need to turn that off every time I drive her car. Else it starts yelling at me and once it actually applied the brakes when I was still fully in control.

Maybe it has something to do with the way I drive....

 

My '17 with collision warning does not brake, it just pre loads the brakes.

There are "heads up" lights on the dash that should reflect in the windshield. ( You should see them when you start your truck and it does its test cycle).
The dash display will say pre collision activated.

Like most of you, it doesn't go off that often.By the time it does go off I am not sure how much it will help.
I guess it would somewhat lessen the damage.
At low stop and go traffic speeds, it can prevent an accident.

That is why I asked if you hit something.
Might be the only way to know.
I am glad mine only pre loads the brakes... if it actually applied the brakes it could be dangerous.

Adaptive cruise control braking is bad enough.

 

OK that makes sense about the brake being pre-loaded. Like many of your experiences the active braking can be a real PITA... especially when making a turn in heavy traffic and you switch into the turn lane as you come up quickly on stopped traffic.

My 2019 Lariat FX-4 doesn't have the HUD. Just got the truck so am still learning but am pretty sure that wasn't an option?

Thanks for the great responses.

 

I think the '19 is supposed to have active braking... not sure though.

 

My '19 window sticker shows "pre collision assist with AEB" Which I assume ia active electronic braking.
The times it happened it was an unusual beeping sound and a warning message on the productivity screen display.
Also, no sensors to be seen, but I think one of the bumper "pads" is the unit itself.

 

The F150 isn't even listed as having it in 2019. Interesting

. https://www.ford.com/technology/driv...assist/#trucks

 

The IPMA aka camera is in the windshield behind the rearview mirror. The higher trim trucks with the adaptive cruise control also use a sensor in the bumper. Ford doesn't fully explain the system well and there is a difference between the co pilot 360 and the trucks equipped with the base pre collision and AEB. The base trucks will only alert the driver and pre charge the brakes for an impending emergency stop and its unclear if they can apply brakes. The trucks with the co pilot 360 can apply the brakes and send a warning both visual with the red lights on the dash and the audio. The co pilot 360 is active from 3mph+ and the pedestrian detection is active until 50mph.

 

Thought mine wasn't working either. Twice now it has come on.

Craig

 

I think this is spot on. I had the same reservations on my 19' Ranger not working. There is a big thread on another (Ranger) forum about people thinking it doesn't work. The reality is they probably didn't want to make it over intrusive. I have mine set to highest sensitivity and never had it go off. I saw a test (Car and Driver, link at bottom) where they tested 4 different brands ( None Ford ) and they all hit the fake blow up car under certain conditions, but they slowed considerably greatly reducing the impact and crash severity. I personally wish we could adjust it more to reflect our driving habits, but apparently there are too many liabilities in doing so. On a side note, with the Ranger, people with the adaptive cruise seem to have their emergency braking activate more frequently. Must be a little more sensitive with the additional radar for the cruise control?? I've tried to get my wife to help me do the test below, but she keeps declining???




Car & Driver test (Click)