Forward Collision Warning

[hamada128]

Thanks for the tag. Have you brought this to the attention of your preferred dealer yet? If not, we would suggest doing so. Feel free to send us a private message if you need to discuss further.

Kate
Jeep Cares

I am planning to do so in my next visit for the oil change and some other misc interior issues. I will show the dealer the video from the dash cam which shows the near miss with no reaction from the front collision system at all, not even a warning.

 

[hamada128]

The sensors arent an end all and be all solution. A set of conditions still has to be met and calculated in time for an action to be taken. Input = output.

I'm not saying that in a good or bad sense - thats just how these systems work from an engineering standpoint.

Understood, but one of the main items when I was shopping for a new SUV is it must have more safety features especially the front collision warning/braking which now with several situations with me and other members here I have no confidence in those safety features in the Jeep anymore. Hopefully an update would fix those issues soon.

 

[BerettaBri]

The sensors arent an end all and be all solution. A set of conditions still has to be met and calculated in time for an action to be taken. Input = output.

I'm not saying that in a good or bad sense - thats just how these systems work from an engineering standpoint.

Excellent point. I would like for Jeep to engineer my system to work. I nearly got into a collision 10 minutes ago and nothing happened.

 

[hamada128]

Excellent point. I would like for Jeep to engineer my system to work. I nearly got into a collision 10 minutes ago and nothing happened.

Do you have it on dashcam? I think the more Jeep sees real time videos of the system failing or not working as it should will make them believe the system is faulty. The dealer will scan the system and find no faults but I am sure an adjustment or more calibration is needed on the GCL since the same system is working fine on other platforms like the Durango and other Jeep models as mentioned before.

 

[BerettaBri]

Do you have it on dashcam? I think the more Jeep sees real time videos of the system failing or not working as it should will make them believe the system is faulty. The dealer will scan the system and find no faults but I am sure an adjustment or more calibration is needed on the GCL since the same system is working fine on other platforms like the Durango and other Jeep models as mentioned before.

I don't have a dashcam. I would like to have a friend assist with video. I have an idea to want to put a large TV box in the street with a blanket over it and drive up on that thing and show how it isn't going to to activate the system.

 

[JWCJeep]

Following!!

 

[mja997]

This system does not work!!!!

 

[hamada128]

This system does not work!!!!

Any real life situation?

 

[Wlinse]

The FCW system is tied to the same sensor as the assisted cruise control.

If that works, your FCW works.

Now - if it doesnt work when you think it should work as in applying the brakes during a potential front-end collision then that is up for debate. But again, a set of conditions have to be met.

 

[Wlinse]

I don't have a dashcam. I would like to have a friend assist with video. I have an idea to want to put a large TV box in the street with a blanket over it and drive up on that thing and show how it isn't going to to activate the system.

Technically no one knows how or when its supposed to work. Only Stellantis engineers/software engineers know that.

How do you know if it doesnt activate after driving X amount of feet from a stop? How do you know it only activates after X MPH? How do you know if it only activates when the sensor sees a certain density in the object it's detecting - so its' able to differentiate between dense rain or fog and a dense object in front of it?

Or...how about a mixture of ALL those or SOME of those scenarios which are calculated?

I'll save you the time, these guys already tried and couldnt figure it out:

 

[JWCJeep]

Well I found that the system does work, but doesn’t.
As many times as a car slammed on brakes or cut in front of me during normal driving the system did not engage, till last night while using the Adaptive Cruise Control w Active Driving Assist Engaged. That is when someone quickly entered the space between me and the car in front and the system altered and braked disengaging the ACC & ADA.
@JeepCares can you chime in here with what Jeep is doing to research the problem.
I wonder what a brand new ‘22 Grand Cherokee L Overland will bring on a trade

 

[JeepCares]

Well I found that the system does work, but doesn’t.
As many times as a car slammed on brakes or cut in front of me during normal driving the system did not engage, till last night while using the Adaptive Cruise Control w Active Driving Assist Engaged. That is when someone quickly entered the space between me and the car in front and the system altered and braked disengaging the ACC & ADA.
@JeepCares can you chime in here with what Jeep is doing to research the problem.
I wonder what a brand new ‘22 Grand Cherokee L Overland will bring on a trade

Thanks for tagging us. We would be happy to discuss your concerns further, send us a private message with details.

Kate
Jeep Cares

 

[Bbiggers340]

So if I ran into a deer this morning and the system didn’t do anything does that count as not working?

 

[Wlinse]

So if I ran into a deer this morning and the system didn’t do anything does that count as not working?

Depends. Was it stationary just standing there in the road 'in the headlights' or did it jump out from the median and suddenly become in front of you in a split second and within a very close distance to the front bumper?

Those are two, and possibly three very different sensor scenarios.

 

[Bbiggers340]

It ran across the road, I was going about 25min I slammed the brakes and bumped it

 

[Wlinse]

It ran across the road, I was going about 25min I slammed the brakes and bumped it

If an object is farther away the system has more time to calculate and respond, hence my question about it suddenly appearing.

Safety braking systems also dont apply themselves when the user has already applied the brakes manually.

It seems the sensors just didnt have enough time and input to do anything before you did if the animal just ran across within a close proximity to the sensors.

 

[eleceng1979]

Please read the manual, Page 239. Persons posting here, their vehicles do not work as described.

NOTE:
FCW monitors the information from the forward looking sensors as well as the Electronic Brake Controller (EBC), to calculate the probability of a forward collision. When the system determines that a forward collision is probable, the driver will be provided with audible and visual warnings and may provide a brake jerk warning. If the driver does not take action based upon these progressive warnings, then the system will provide a limited level of active braking to help slow the vehicle and mitigate the potential forward collision. If the driver reacts to the warnings by braking and the system determines that the driver intends to avoid the collision by braking but has not applied sufficient brake force, the system will compensate and provide additional brake force as required.
If a Forward Collision Warning with Mitigation event begins at a speed below 39 mph (62 km/h), the system may provide maximum braking to mitigate the potential forward collision. If the Forward Collision Warning with Mitigation event stops the vehicle completely, the system will hold the vehicle at a standstill for two seconds and then release the brakes.

 

[alyron619]

I have a 22 GC 2 row. I had what I thought were several instances where I thought the system should have intervened but did not. In all those cases I had plenty of time to react myself. Then yesterday on the highway I had a car switch lanes in front of me without warning and within a few feet while we were doing a good 70mph. Guess what, the system worked as designed and my dashboard lit up (was looking at road so couldn’t read it), and car gave audible alert and applied brakes. I immediately hit brakes out of reflex and was able to easily avoid a crash. Hopefully no one else will need it like that but I now know it works, at least on my car.

 

[mja997]

We all know how it does not work, so how to get organized and make Jeep do a recall ? How to start the process? Or we can all stay in here complaining with Jeep do in g nothing about it. I placed a large piece of cardboard held up by strings on each side in my road. Guess what happened when I approached it at 15mph? Nothing happen and proves this system does not work.

 

[Sarge]

Mine will just randomly turn off the system, for no apparent reason. Which seems like a blessing in disguise at this point. Everything electrical on this car is suspect. It's now rated below Range Rover for quality/problems, and Jeep seems to have no clue what's going on with any of it.