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-   -   MUST READ 2014 Jeep GC Forward Collision \ Adjustable Cruise Control Failure (http://www.jeepgarage.org/f107/must-read-2014-jeep-gc-forward-collision-adjustable-cruise-control-failure-65915.html)

655321 09-25-2013 01:38 PM

MUST READ 2014 Jeep GC Forward Collision \ Adjustable Cruise Control Failure
 
I have summed pretty much everything up in this video.

2014 JEEP GRAND CHEROKEE FCW\ACC FAILURE CHRYSLER - YouTube

Scottina06 09-25-2013 01:52 PM

Re: MUST READ 2014 Jeep GC Forward Collision \ Adjustable Cruise Control Failure
 
the vehicle DOES NOT apply the brakes. Sounds like you need a new front sensor. Work with your dealer...or find another. Show them the video.

655321 09-25-2013 02:03 PM

Re: MUST READ 2014 Jeep GC Forward Collision \ Adjustable Cruise Control Failure
 
i wasn't able to catch it apply the brakes, but it does. There will be nothing in front of me at all, and then all of a sudden the FCW goes off saying BRAKE, BRAKE, BRAKE, and the car applies hard brake pressure. The dealer wont take the video as proof and want to drive it for themselves. They wont replace anything because they cant find anything wrong. It goes back there again on Monday for an overnight stay and the case will be escalated to a case manager from STAR.

Scottina06 09-25-2013 02:34 PM

Re: MUST READ 2014 Jeep GC Forward Collision \ Adjustable Cruise Control Failure
 
braking is NOT a function of the fcw...but it is for the acc...obviously.....but only to a certain mph UNLESS your 14 has acc w/stop. The function of fcw is to warn you and get the brakes prepared for a hard stop. Maybe there is some malfunction of your acc and fcw at the same time causing it to brake?

SLLJG 09-25-2013 02:35 PM

Re: MUST READ 2014 Jeep GC Forward Collision \ Adjustable Cruise Control Failure
 
My 2014 Jeep Grand Cherokee Overland had a similar event recently. (The Jeep then had been driven about 4,000 miles.) On any empty highway, the instrument cluster LCD displayed, in capital red letters, "BRAKE! BRAKE! BRAKE!" Of course, I braked immediately. My Jeep, which has the Advance Tech option, has far too many bugs (v13.10.0). I hope that Chrysler issues soon a major update for firmware and software. If my Jeep should become troublesome, I'd get rid of it and return to my trouble-free 2007 Subaru Outback.

655321 09-25-2013 02:45 PM

Re: MUST READ 2014 Jeep GC Forward Collision \ Adjustable Cruise Control Failure
 
It will apply the brakes hard on you at any speed, has happened to me multiple times on the highway and in the city. It will not stop you , but it give the message BRAKE with loud tone, while simultaneously braking for you and there is pedal vibration like the abs is going off.

2012 Summit 09-25-2013 02:46 PM

Re: MUST READ 2014 Jeep GC Forward Collision \ Adjustable Cruise Control Failure
 
Quote:

Originally Posted by Scottina06 (Post 899286)
the vehicle DOES NOT apply the brakes. Sounds like you need a new front sensor. Work with your dealer...or find another. Show them the video.

I believe the 2014"s do apply the brakes with FCW (at least a brake jerk).

FORWARD COLLISION WARNING (FCW) WITH
MITIGATION — IF EQUIPPED


Forward Collision Warning (FCW) With Mitigation
Operation
The Forward Collision Warning (FCW) system with
mitigation provides the driver with audible warnings,
visual warnings (within the EVIC), and may apply a
brake jerk to warn the driver when it detects a potential
frontal collision. The warnings and limited braking are
intended to provide the driver with enough time to react,
avoid or mitigate the potential collision.

FCW monitors the information from the forward looking
sensor as well as the Electronic Brake Controller (EBC), to
calculate a probable forward collision. When the system
determines that a forward collision is probable, an audible
and visual warning message will be displayed
within the EVIC along with a brake jerk warning. When
the system senses the driver applying the brakes to avoid
a probable collision, additional braking force will be
provided to the vehicle.

SLLJG 09-25-2013 02:50 PM

Re: MUST READ 2014 Jeep GC Forward Collision \ Adjustable Cruise Control Failure
 
FCW did not decelerate my Jeep nor did it vibrate the brake pedal when the EVIC displayed "BRAKE! BRAKE! BRAKE!"

655321 09-25-2013 02:58 PM

Re: MUST READ 2014 Jeep GC Forward Collision \ Adjustable Cruise Control Failure
 
yeah "brake jerk" in person it feels like someone slams the brake on for a split second multiples times over a few seconds.

Scottina06 09-25-2013 03:36 PM

Re: MUST READ 2014 Jeep GC Forward Collision \ Adjustable Cruise Control Failure
 
Ive had the brake brake brake...but never felt the brakes. I was told it readies the brakes for hard braking

willjeep 09-25-2013 03:56 PM

Re: MUST READ 2014 Jeep GC Forward Collision \ Adjustable Cruise Control Failure
 
I can attest that Fcw defiantly will apply the brakes, also it is not a smooth brake but a jerky type feel. Maybe only front brakes are applied? I have uses the ACC and I love it, I did get the alert that it was unavailable while in the mountains of N.C. I thick it was because the sensor kept being pointed into the trees then out again. It always started worked right after.

lstowell 09-25-2013 04:06 PM

Re: MUST READ 2014 Jeep GC Forward Collision \ Adjustable Cruise Control Failure
 
Quote:

Originally Posted by Scottina06 (Post 899286)
the vehicle DOES NOT apply the brakes. Sounds like you need a new front sensor. Work with your dealer...or find another. Show them the video.

According to the Owners Manual, it does apply the brakes, both as a warning and additional braking if the driver applies any braking.

Forward Collision Warning (FCW) With Mitigation
Operation
The Forward Collision Warning (FCW) system with
mitigation provides the driver with audible warnings,
visual warnings (within the EVIC), and may apply a
brake jerk
to warn the driver when it detects a potential
frontal collision. The warnings and limited braking are
intended to provide the driver with enough time to react,
avoid or mitigate the potential collision.
NOTE:
FCW monitors the information from the forward looking
sensor as well as the Electronic Brake Controller (EBC), to
calculate a probable forward collision. When the system
determines that a forward collision is probable, an audible
and visual warning message will be displayed
within the EVIC along with a brake jerk warning. When
the system senses the driver applying the brakes to avoid
a probable collision, additional braking force will be
provided to the vehicle.

If there were some sort of problem with the controller applying the warning braking, it wouldn't be impossible for that to be too much warning.

The warning jerk is intended to be noticeable to the driver... where the driver would be presumed to be less than attentive or the warning would not be needed.


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