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  #13  
Old 12-29-2014, 04:49 PM
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Re: Forward collision warning question

I have tried pulling up behind tractor trailer within a car length or less - nothing. ACC works great! 2 activations were round a curve with a car off the road - no braking, also one when approaching a car that was making a right turn. 2 "false" activations when no one in front for 100-150 feet. Drive close to car ahead and nothing happens!

Not sure if it is working or not!

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  #14  
Old 12-29-2014, 05:29 PM
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Re: Forward collision warning question

The first day I got my ride, I was a bit "surprised" by this feature. I was on my way home from the dealer and as previously explained, a car in front of me turned onto a lane left of me and when I approached it, I heard an audible warning, got a message in the speedometer and after that, the vehicle applied the brakes on its own. Was a bit spooky...

I decided that the "far"-setting was a bit too sensitive for me so I set it to "close" (or "near" - not sure what it's called) and it seems that this setting is VERY tolerant. So far, it never came on - even when I tried to test it. I wasn't comfortable waiting any longer before braking on my own so I don't know when it comes on.

When I start my vehicle, I often get the message 'ACC/FCW limited functionality' but when I activate ACC, it's been working so far.
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Old 12-29-2014, 06:35 PM
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Re: Forward collision warning question

I have set it off by being in the right lane and merging into the left lane right behind a passing car. If you merge right on their butt (like your trying to sneak into a small gap) it will set off the warning. It helps if you are giving it some gas to match their speed.

If you really want to test it though I would try that with someone you know driving past you. You could easily piss the driver in front of you off.

Kind of like what I imagine a crashing plane to be like. screens blink and audible alarms beeping.
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  #16  
Old 03-28-2015, 05:19 PM
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Re: Forward collision warning question

If you can't get an alert, you are not alone this system is flaky to say the least. If you want to test it safely try running into an inflatable object without touching the brake or letting off the accelerator and moving at over 5MPH. I used an air mattress with my 2015 overland with ACC+ Stop and FCW with stop. My ACC+ stop seems to work fine but the FCW+ stop does not work well at all, Chrysler and the dealer are no help at all.


I talked to Consumer Reports and they have not tested this feature on the JGC as the one they purchased did not have it but now plan to do it in the future. I have had the feature on a new Subaru and it worked perfectly as it should.
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Old 03-28-2015, 06:33 PM
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Originally Posted by Smoky View Post
If you can't get an alert, you are not alone this system is flaky to say the least. If you want to test it safely try running into an inflatable object without touching the brake or letting off the accelerator and moving at over 5MPH. I used an air mattress with my 2015 overland with ACC+ Stop and FCW with stop. My ACC+ stop seems to work fine but the FCW+ stop does not work well at all, Chrysler and the dealer are no help at all.

I talked to Consumer Reports and they have not tested this feature on the JGC as the one they purchased did not have it but now plan to do it in the future. I have had the feature on a new Subaru and it worked perfectly as it should.
Works well on my 2014. Remember the fcw with mitigation is only going to beep and shutter and give you that mild braking if you are on the gas. The second you touch the brake and it knows now that your intention is to stop the jeep it will compensate with necessary hard braking if it feels you are not doing enough for the situation. That is how fcw with mitigation is designed to work. When you are on the gas the jeep doesnt know your intention in a situation maybe you would rather swerve quickly around something and if the jeep stood on the brakes in that situation well that may not be what you wanted so it needs that touching of the brakes to understand you and take more substantial action. There is a fine line between it doing what you want and being to intrusive.
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Old 03-29-2015, 10:35 AM
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Re: Forward collision warning question

I appreciate the thought but that just doesn't make a lot of sense. First you say it only works when your on the gas, then you need to touch the brake to so it understands your intention. If you touch the brake you disable the feature period.
The whole reason for having this feature is to alert you when you are not paying attention,falling asleep or in an emergency situation. If your touching the brake your in control and no alert is needed!
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Old 03-29-2015, 11:47 AM
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Re: Forward collision warning question

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Originally Posted by Smoky View Post
I appreciate the thought but that just doesn't make a lot of sense. First you say it only works when your on the gas, then you need to touch the brake to so it understands your intention. If you touch the brake you disable the feature period.
The whole reason for having this feature is to alert you when you are not paying attention,falling asleep or in an emergency situation. If your touching the brake your in control and no alert is needed!
I think you are mixing up the FCW and the ACC, I only stated I was talking about the FCW in my last post, they are two different systems ACC is only on if you engage it and if you hit the brakes it turns off. FCW is always on as long as you have the box checked in the uconnect screen.

There are two parts to FCW with mitigation, the warning part and the mitigation part. With the warning part if you are on the gas and you are about to run into a car in front of you it will beep, shutter and give you some mild braking that's if you are on the gas if you stay on the gas you will run into that back of the car in front of you. However if you react at all to the situation and touch the brakes the mitigation part kicks in because now the jeep understands that its your intention to avoid a collision. The mitigation will brake hard if it sense you are not doing enough for the situation to slow the jeep, it will compensate with needed additional braking.

If you engage ACC(adaptive cruise control) while cruising it acts differently, by you engaging that system you are telling it to keep a set distance from the car in front of you if it needs to it will stand on the brakes to keep that distance to a stop, if you touch the brakes the ACC system disengages and turns manual control back over to you an in doing that its back over to the fcw with mitigation mode.

I have been using the systems for nearly two years now and I really do like them. FCW gives you that extra bit of warning and brake assistance with out being to intrusive and ACC is an excellent highway cruising tool.
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Old 03-29-2015, 12:29 PM
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Re: Forward collision warning question

While I am certainly glad to hear your satisfied with the safety features on your car and feel your FCW is working properly, many of us are not. That is because mine was not alerting at all under any circumstances. After they apparently did a re-flash it still is not working to these specs.


No, as I stated previously the ACC works great but they do work in conjunction by using the same cameras and sensors according to Chrysler. The following is a quote from the tech sheet they sent me:


" Forward Collision Warning Plus (FCW+) - The FFC in conjunction with the radar sensor is used to detect whether the vehicle is approaching another vehicle or large obstacle in its path too rapidly and will warn/assist the driver in avoiding/mitigating the incident (when Enabled). The driver has the ability to adjust the sensitivity and turn brake support on or off in the radio."
This means to me that I should get an alert any time that I'm in that situation otherwise it is malfunctioning! How else can you interrupt that!


Further they say and I quote:


"Adaptive Cruise Control and Forward Collision Warning Plus (ACC+/FCW+) - The FFC reports to the Adaptive Cruise Control (ACC) module to create the enhanced ACC+ as well as the FCW+ operation. These components share a private CAN C bus where data from the FCC is sent to the ACC module for data fusion."


This data goes on and on and gets even more detailed with the ACC/FCW Plus stop which is what my car has.
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Old 03-29-2015, 01:01 PM
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Re: Forward collision warning question

Quote:
Originally Posted by Smoky View Post
While I am certainly glad to hear your satisfied with the safety features on your car and feel your FCW is working properly, many of us are not. That is because mine was not alerting at all under any circumstances. After they apparently did a re-flash it still is not working to these specs.


No, as I stated previously the ACC works great but they do work in conjunction by using the same cameras and sensors according to Chrysler. The following is a quote from the tech sheet they sent me:


" Forward Collision Warning Plus (FCW+) - The FFC in conjunction with the radar sensor is used to detect whether the vehicle is approaching another vehicle or large obstacle in its path too rapidly and will warn/assist the driver in avoiding/mitigating the incident (when Enabled). The driver has the ability to adjust the sensitivity and turn brake support on or off in the radio."
This means to me that I should get an alert any time that I'm in that situation otherwise it is malfunctioning! How else can you interrupt that!


Further they say and I quote:


"Adaptive Cruise Control and Forward Collision Warning Plus (ACC+/FCW+) - The FFC reports to the Adaptive Cruise Control (ACC) module to create the enhanced ACC+ as well as the FCW+ operation. These components share a private CAN C bus where data from the FCC is sent to the ACC module for data fusion."


This data goes on and on and gets even more detailed with the ACC/FCW Plus stop which is what my car has.
I realize they share the same sensors and canbus when they are functioning I thought that was a given. it sounded in the post like you were confusing the two that's why I went on to explain them in trying to help, yes your system is broken. sorry for responding to your post to try and help I wont do it again
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Old 03-29-2015, 01:19 PM
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Re: Forward collision warning question

Hey, I appreciate all the help that I can get and many of the people on this forum do not fully understand the feature so by continuing this thread they can learn. I unfortunately now know way more then I ever wanted to and am still learning from yours and other posts. I'm afraid that they have dumbed the FCW down to the point of uselessness in later years because it was just giving them to many issues. I drove more than one 2015 at the dealer with the same result. The problem is they will not tell us that up front before we spend the big bucks. Now they can just say that it is working as it was designed and avoid dealing with it!
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