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  #25  
Old 12-06-2010, 04:55 AM
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Re: Advanced Warning/ACC Group Question

How close are each of the following distances? Does it adjust the differences for speed? Is the closest distance close enough to get a good draft?

Is it jerky at all with the braking? Will it coast rather than brake to slow down? What I don't want is a system that will apply brakes during casual highway driving where decelerating can be done by coasting instead.

I've got the package on order, just hope it suits my driving style.
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  #26  
Old 12-06-2010, 12:40 PM
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Re: Advanced Warning/ACC Group Question

The following distance on the adaptive cruise control can be set to either 1 (close), 2 (medium) or 3 (farther) with a button on the steering wheel. I am not sure if the distance is speed dependent but I don't think so. I find that 1 is a bit too close for my comfort, so I normally use 2 when I am using ACC.

The braking is very natural, it is doing what you would do anyway. I am not sure I would trust it if traffic ahead came to a full stop since I do not know what its limits are. When on a four lane highway with the adaptive cruise set to 55 mph and a red traffic light a quarter of a mile ahead, I allowed the cruise control to do its thing. It slowed and maintained a safe distance from the car in front of me as that car slowed (ACC distance set to "2") and as the car in front of me braked to a stop, I got the full beeping warning and felt strong braking as my car slowed below 25 mph. I am not sure if the beeping was the forward collision warning system or a warning that ACC was being disengaged (below 25 mph). While it SEEMED like the braking was going to stop the car completely before I hit the car in front of me, I wasn't prepared to test the ACC to that extent, so I applied the brakes myself for the final short distance.

Blind spot warning and cross traffic detection work great as well. I haven't tried out the forward collision warning yet (unless that is what I was getting when the car was braking above). I don't know if ACC has to be engaged to get the braking - I'd really like to know that.

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  #27  
Old 12-06-2010, 12:46 PM
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Re: Advanced Warning/ACC Group Question

[QUOTE=CrazyJ
Is it jerky at all with the braking? [/QUOTE]

Not at all. When in moderate freeway traffic, I barely know the ACC is working. It seems to magically maintain the right interval and I don't feel the brakes unless there is a sudden slowdown in front of me. Usually, it uses the throttle to maintain interval.
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  #28  
Old 12-06-2010, 03:54 PM
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Re: Advanced Warning/ACC Group Question

Quote:
Originally Posted by RedBolt View Post

The braking is very natural, it is doing what you would do anyway. I am not sure I would trust it if traffic ahead came to a full stop since I do not know what its limits are. When on a four lane highway with the adaptive cruise set to 55 mph and a red traffic light a quarter of a mile ahead, I allowed the cruise control to do its thing. It slowed and maintained a safe distance from the car in front of me as that car slowed (ACC distance set to "2") and as the car in front of me braked to a stop, I got the full beeping warning and felt strong braking as my car slowed below 25 mph. I am not sure if the beeping was the forward collision warning system or a warning that ACC was being disengaged (below 25 mph). While it SEEMED like the braking was going to stop the car completely before I hit the car in front of me, I wasn't prepared to test the ACC to that extent, so I applied the brakes myself for the final short distance.

That's my question, if you have it set and lets say the car in front of you comes to a complete stop does the ACC bring you to a complete stop?

What if the car in front of you slams on their brakes, can the ACC control that sudden stop?
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  #29  
Old 12-06-2010, 08:56 PM
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Re: Advanced Warning/ACC Group Question

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Originally Posted by IndyBob View Post
Bob, I picked up my Overland with the Tech group just a few days ago also. Like you I found all the systems work very well. The only one I am confused about the the front collision warning.

Is that something that only works when the cruise is on or should it be working all the time? It's pretty hard to see if it's working but I have purposely came up pretty fast on the rear of a car in front of me but never got a warning.

Any thoughts?

Thanks
I haven't tried to figure it out YET. Here's the info in the owners manual for the collision warning.

<A name=subtopic-6>
<A name=ssubtopic-1>


Forward Collision Warning — If Equipped

Forward Collision Warning (FCW) warns the driver of a potential collision with the vehicle in front of you and prompts the driver to take action in order to avoid the collision.
FCW monitors the information from the forward looking sensor as well as the Electronic Brake Controller (EBC), wheel speed sensors, i.e., to calculate a probable rear-end collision. When the system determines that a rear-end collision is probable a warning message (both audible and visual) will be displayed on the EVIC. When the system determines a collision with the vehicle in front of you is no longer probable, the warning message will be deactivated.

[IMG]file:///D:/Owners_Info_Mac.app/Contents/Resources/Content/en/11WK741-126-AC_GRC/img/032433107.gif[/IMG]

FCW Message
Warning!Forward Collision Warning (FCW) is not intended to avoid a collision on its own. The driver has the responsibility to avoid a collision by controlling the vehicle via braking and steering. Failure to follow this warning could lead to serious injury or death.
<A name="">

Changing FCW status

The FCW feature can be set to far, set to near or turned off in the Electronic Vehicle Information Center (EVIC) refer to “Electronic Vehicle Information Center (EVIC)” in “Understanding Your Instrument Panel” for further information. The FCW Status Off, Near or Far will be displayed in the EVIC.
<A name="">
[IMG]file:///D:/Owners_Info_Mac.app/Contents/Resources/Content/en/11WK741-126-AC_GRC/img/032433432.gif[/IMG]

Example Only
The default status of FCW is the “Far” setting, this allows the system to warn you of a possible collision with the vehicle in front of you when you are farther away. This gives you the most reaction time.
Changing the FCW status to the “Near” setting, allows the system to warn you of a possible collision with the vehicle in front of you when you are much closer. This setting provides less reaction time than the “Far” setting, which allows for a more dynamic driving experience.
Changing the FCW status to “Off” prevents the system from warning you of a possible collision with the vehicle in front of you.
Note: In the “Off” setting FCW OFF will be displayed in the EVIC. <A name="">
[IMG]file:///D:/Owners_Info_Mac.app/Contents/Resources/Content/en/11WK741-126-AC_GRC/img/032033147.gif[/IMG]

FCW Off Example


Note:
  • The system will retain the last setting selected by the driver after ignition shut down.
  • FCW will not react to irrelevant objects such as overhead objects, ground reflections, objects not in the path of the car, stationary objects that are far away, oncoming traffic, or leading vehicles with the same or higher rate of speed.
  • FCW will be disabled like ACC below with the unavailable screens.

<A name="">

FCW Unavailable Warning

If the system turns off, and the EVIC displays “ACC/FCW Unavailable, Vehicle System Error”, there may be a temporary malfunction that limits FCW functionality. Although the vehicle is still drivable under normal conditions, FCW will be temporarily unavailable. If this occurs, try activating FCW again later, following a key cycle. If the problem persists, see your authorized dealer.
<A name="">

Service FCW Warning

If the system turns off, and the EVIC displays “ACC/FCW Unavailable Service Radar Sensor”, it indicates there is an internal system fault. Although the vehicle is still drivable under normal conditions, have the system checked by an authorized dealer.
<A name="">
[IMG]file:///D:/Owners_Info_Mac.app/Contents/Resources/Content/en/11WK741-126-AC_GRC/img/032433104.gif[/IMG]

ACC/FCW Unavailable Warning
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  #30  
Old 05-29-2011, 05:39 AM
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Re: Advanced Warning/ACC Group Question

Personally I think the package is well worth the $1200, in fact it's the only upgrade that could actually pay for itself. I've had mine for about 2 weeks, the blind spot monitoring works great. It's not annoying at all because there is no audible sound unless you are moving into the lane where a car is in your blink spot. The system also warns you if you are backing out of a parking spot and a car is approaching from the side, very nice. The ACC works great when it's working (mine needs service already) I will break fairly hard if necessary, it almost brought my jeep to a complete stop once when the car in front of me stopped. (Of course I took over before it came to a complete stop.)
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  #31  
Old 05-29-2011, 07:58 AM
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Quote:
Originally Posted by IndyBob View Post
Bob, I picked up my Overland with the Tech group just a few days ago also. Like you I found all the systems work very well. The only one I am confused about the the front collision warning.

Is that something that only works when the cruise is on or should it be working all the time? It's pretty hard to see if it's working but I have purposely came up pretty fast on the rear of a car in front of me but never got a warning.

Any thoughts?

Thanks
FCW works all of the time. It has saved my butt one time already. When you were trying it out, did you have the the foot lightly on the brake? I have noticed that if you have any brake pressure (even if not enough to stop a collision), you will not get a warning. I think it assumes you are already reacting. Your foot has to be off the brake to get the warning. The best way to try it out is on a curvy road. Keep speed through the turns and the system will go off as it detects objects... On a curvy highway off-ramp with side barriers, it will almost always go off if you have the speed up...
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