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  #13  
Old 02-18-2013, 09:31 AM
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Re: No longer sure if I trust ACC

While the braking by ACC was automatic, the same potential result would have been in place if you saw a problem and applied your brakes manually. The dude following too closely behind you was the problem, not the technology you were or were not using.

I was skeptical at first about ACC, but have come to love it. I occasionally get a "false" with FCW, but have never experienced ACC braking for something small like a bag blowing across the road. That's strange...
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  #14  
Old 02-18-2013, 10:47 AM
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Re: No longer sure if I trust ACC

The ACC is too sensitive for my tastes. Way too much random braking.
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  #15  
Old 02-18-2013, 10:50 AM
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Re: No longer sure if I trust ACC

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Originally Posted by andyh View Post
The ACC is too sensitive for my tastes. Way too much random braking.
Have you tried changing the distance? Set to 1 or 2, and it'll only react much closer. I've noticed distance 3 can be annoying for that, reacting way too early to cars in front (like when I'm about to pull into the passing lane, and it decides to start breaking for the truck in the driving lane).
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  #16  
Old 02-18-2013, 10:54 AM
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Re: No longer sure if I trust ACC

I agree with rovinrail...I started out at "3" when I got my Jeep, but quickly realized that I needed to move to "2" and now "1" for most circumstances. The only time the braking is annoying for me is when some idiot cuts in front from another lane and honestly, I'd have to be braking manually for that, too, in most cases as I really don't like following too closely.
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  #17  
Old 02-18-2013, 10:56 AM
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Re: No longer sure if I trust ACC

I always leave it on the shortest distance. The braking I see are things like a car getting off the highway and is clearly on the exit ramp, yet my Jeep slams on the brakes. I usually counteract the braking with full throttle acceleration.
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  #18  
Old 02-18-2013, 12:17 PM
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Re: No longer sure if I trust ACC

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Originally Posted by andyh View Post
I always leave it on the shortest distance. The braking I see are things like a car getting off the highway and is clearly on the exit ramp, yet my Jeep slams on the brakes. I usually counteract the braking with full throttle acceleration.
That doesn't sound right if the car ahead of you is clearly not in your lane. Perhaps the sensor is out-of-alignment. Mine has never applied the brakes under those circumstances. Perhaps your dealer could check the alignment of the sensor.
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Old 02-18-2013, 12:20 PM
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Re: No longer sure if I trust ACC

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Originally Posted by Jim_in_PA View Post
While the braking by ACC was automatic, the same potential result would have been in place if you saw a problem and applied your brakes manually. The dude following too closely behind you was the problem, not the technology you were or were not using.

I was skeptical at first about ACC, but have come to love it. I occasionally get a "false" with FCW, but have never experienced ACC braking for something small like a bag blowing across the road. That's strange...
I agree, strange how the blowing bag triggered the brakes. Mine won't even trigger the brakes when a deer crosses the road in front of me. I've had a couple close calls.
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  #20  
Old 02-18-2013, 01:42 PM
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Re: No longer sure if I trust ACC

I'll also mention that I've gotten into the habit of wiping the radar sensor off with reasonable frequency, especially during these winter months with all the "stuff" they put on the road to counteract freezing. (sam for the backup camera lens) I seem to get very few "falsies" when the dome is clean.
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  #21  
Old 02-18-2013, 11:43 PM
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Re: No longer sure if I trust ACC

Cc on snow? No no no...
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Old 02-19-2013, 01:00 AM
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Re: No longer sure if I trust ACC

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Originally Posted by JG1025 View Post
Today I was in the middle lane of the interstate and had the ACC set at 74, distance 2, and had no cars close ahead of me...and my FCW went off and the car started the emergency braking which almost caused the car behind me to hit me.
Happened to me too just last week while tooling around at about 72 without anyone or anything in front of me. Suddenly it just slammed on the brakes for no reason. I immediately took control. Luckily the person behind me was a fair distance away, but I'm sure he was wondering "why in the world did that person just slam on the brakes?"
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  #23  
Old 02-19-2013, 07:49 AM
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Re: No longer sure if I trust ACC

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Originally Posted by 2012 Summit View Post
FYI, the FCW does not apply the brakes (at least not on the 2012 JGC). The ACC system will apply up to a maximum of 25% of the vehicle’s braking capability


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.

ADAPTIVE CRUISE CONTROL (ACC) — IF
EQUIPPED


Adaptive Cruise Control (ACC) increases the driving
convenience provided by cruise control while traveling
on highways and major roadways. However, it is not a
safety system and not designed to prevent collisions.
ACC will allow you to keep cruise control engaged in
light to moderate traffic conditions without the constant
need to reset your cruise control. ACC utilizes a radar
sensor designed to detect a vehicle directly ahead of you.
NOTE:
• If the sensor does not detect a vehicle ahead of you,
ACC will maintain a fixed set speed.
• If the ACC sensor detects a vehicle ahead, ACC will
apply limited braking or acceleration (not to exceed
the original set speed) automatically to maintain a
preset following distance, while matching the speed of
the vehicle ahead.
Oh I guarantee you the 2012 JGC Summit applies the brakes...and hard if need be.
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  #24  
Old 02-19-2013, 08:45 AM
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Re: No longer sure if I trust ACC

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Originally Posted by BuckeyeSRT View Post
Oh I guarantee you the 2012 JGC Summit applies the brakes...and hard if need be.
You might want to re-read my post. I said the FCW system does not apply the brakes (this I can guarantee).

Here's exactly what I said:

"FYI, the FCW does not apply the brakes (at least not on the 2012 JGC). The ACC system will apply up to a maximum of 25% of the vehicle’s braking capability"
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