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Old 03-03-2015, 10:54 AM
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Is the Forward Collision Prevention system different on the Cherokee?

The front crash prevention on the Grand is labeled "Advanced" 2 Points
The front crash prevention on the Cherokee is labeled "Superior" 5 Points

Scroll down and click Front Crash Prevention button for more details on each

Vehicle details Grand

Vehicle details Cherokee


I did notice that on the Grand even though title says 2015 they tested a 2014.
On the Cherokee they tested a 2015.

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Old 03-09-2015, 04:34 PM
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Is the Forward Collision Prevention system different on the Cherokee?

Yes.. they have two different systems. The cherokee being more advanced than the Grand Cherokee.

The Cherokee will bring the vehicle to a full stop if necessary, whereas the Grand Cherokee will only brake for two seconds, the driver must then take over.

The Renegade also has the new system, also fitted to the Cherokee.


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Old 03-09-2015, 08:12 PM
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Re: Is the Forward Collision Prevention system different on the Cherokee?

Quote:
Originally Posted by 2mad2bad View Post
Yes.. they have two different systems. The cherokee being more advanced than the Grand Cherokee.

The Cherokee will bring the vehicle to a full stop if necessary, whereas the Grand Cherokee will only brake for two seconds, the driver must then take over.

The Renegade also has the new system, also fitted to the Cherokee.


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Thanks do you have any links that explain it?

Also I suspect IIHS tested an Early MY14 in 2013 which did have an ACC that could not do a Full Stop. It was upgraded around July 2013. The IIHS Report came out in Sept 2013.

I don't think any FCW system does full stop yet. You'd need rear, Radar/Cameras to see what's coming up behind in order to do an emergency full stop.

FYI, 2015 brochures look EXACTLY the same.

This is from the 2015 Grand Cherokee Brochure

Forward collision warning with crash
mitigation (FCW)14 Radar sensors detect when
Grand Cherokee may be approaching another
vehicle too rapidly and send an audible and
visual alert to the driver. The system also
provides 1.5 seconds of braking assistance
if the driver does not react in time. Available.


This is from the 2015 Cherokee Brochure

FULL-SPEED Forward Collision Warning ( FCW)
with crash mitigation Radar sensors detect when Cherokee may be approaching
another vehicle too rapidly and send an audible and visual
alert to the driver along with providing 1.5 seconds of brake
assistance if the driver does not react in time. (Available)
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Old 03-10-2015, 05:53 AM
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Re: Is the Forward Collision Prevention system different on the Cherokee?

Quote:
Originally Posted by mswlogo View Post
I don't think any FCW system does full stop yet. You'd need rear, Radar/Cameras to see what's coming up behind in order to do an emergency full stop.
Can you expound upon your assertion here? From my perspective, if a frontal collision is unavoidable then a "full stop" is going to happen one way or another—ergo, the FCW sensor is requisite and sufficient in that scenario.

Now, it is unlikely that "unavoidable collision" and "able to come to a complete stop" have much overlap, but in the case of an unavoidable collision I would like the FCW to have the capability to elect to apply 100% brake rather than the partial braking we have now. Of course, this presupposes that FCW is tuned to trigger full braking only in truly unavoidable collision scenarios.
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Old 03-10-2015, 08:50 AM
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Re: Is the Forward Collision Prevention system different on the Cherokee?

Quote:
Originally Posted by mswlogo View Post
Thanks do you have any links that explain it?

Also I suspect IIHS tested an Early MY14 in 2013 which did have an ACC that could not do a Full Stop. It was upgraded around July 2013. The IIHS Report came out in Sept 2013.

I don't think any FCW system does full stop yet. You'd need rear, Radar/Cameras to see what's coming up behind in order to do an emergency full stop.

FYI, 2015 brochures look EXACTLY the same.

This is from the 2015 Grand Cherokee Brochure

Forward collision warning with crash
mitigation (FCW)14 Radar sensors detect when
Grand Cherokee may be approaching another
vehicle too rapidly and send an audible and
visual alert to the driver. The system also
provides 1.5 seconds of braking assistance
if the driver does not react in time. Available.


This is from the 2015 Cherokee Brochure

FULL-SPEED Forward Collision Warning ( FCW)
with crash mitigation Radar sensors detect when Cherokee may be approaching
another vehicle too rapidly and send an audible and visual
alert to the driver along with providing 1.5 seconds of brake
assistance if the driver does not react in time. (Available)
That full stop capability is for ACC only, not FCW, and yes it came on models built from July 2013 onwards.
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Old 03-10-2015, 09:26 AM
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Re: Is the Forward Collision Prevention system different on the Cherokee?

Quote:
Originally Posted by f1anatic View Post
That full stop capability is for ACC only, not FCW, and yes it came on models built from July 2013 onwards.
Yes I know. But it was an upgraded system that probably affected FCW as well.

The difference in REDUCED mph for FCW for both high speed and low speed tests between Cherokee and GC is very significant.

I suspect it was an early MY14 GC they tested and they are reporting that the test applies to late build MY14 and all MY15.

The system was upgraded significantly.
But there is no easy way for end user to know the impact on FCW performance.

I believe it was the ABS control module that was upgraded to support ACC full stop.
I suspect the ABS control module has a little something to do with FCW.

It was also the early ABS Control module that caused the XMAS tree.
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Old 03-11-2015, 05:47 PM
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Re: Is the Forward Collision Prevention system different on the Cherokee?

I did find out that IIHS tested the 2014 Grand Cherokee on June 17, 2013 So they did use a sample prior to the last Bosch ABS upgrade that gives the system full stop capability on ACC. The point is, it's not the same system they tested and they are using these test results as applicable to late build 2014's and 2015's. ACC and FCW are one and the same system (just two different uses).
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Old 03-11-2015, 05:49 PM
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Re: Is the Forward Collision Prevention system different on the Cherokee?

Could not fix font color in prior post.

I did find out that IIHS tested the 2014 Grand Cherokee on June 17, 2013 So they did use a sample prior to the last Bosch ABS upgrade that gives the system full stop capability on ACC. The point is, it's not the same system they tested and they are using these test results as applicable to late build 2014's and 2015's. ACC and FCW are one and the same system (just two different uses).
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Old 03-11-2015, 06:50 PM
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Re: Is the Forward Collision Prevention system different on the Cherokee?

Here you go, some info for you :


Jeep Grand Cherokee WK2 - Forward Collision Warning Plus
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Old 03-11-2015, 07:55 PM
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Quote:
Originally Posted by philbytx View Post
Thanks. Reading that was the metaphorical tour of a sausage factory.

FCW will only apply 1/3 of braking force for a maximum of 1.5 seconds before releasing the brakes to allow us to smash into our doom, and it won't activate at all on stationary objects even when it determines a collision is imminent (it will sound a "you're going to die but I won't do anything about it" alert for you, though).

I wonder if FCW 2.0 will have a "email next of kin" option that triggers after it releases the brakes and sends the Jeep hurtling into the collision.
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Old 03-11-2015, 08:20 PM
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Re: Is the Forward Collision Prevention system different on the Cherokee?

Quote:
Originally Posted by philbytx View Post
I've seen that. It does not help resolve the discrepancy IIHS is reporting.
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Old 03-11-2015, 08:23 PM
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Re: Is the Forward Collision Prevention system different on the Cherokee?

Quote:
Originally Posted by Roadkill View Post
Thanks. Reading that was the metaphorical tour of a sausage factory.

FCW will only apply 1/3 of braking force for a maximum of 1.5 seconds before releasing the brakes to allow us to smash into our doom, and it won't activate at all on stationary objects even when it determines a collision is imminent (it will sound a "you're going to die but I won't do anything about it" alert for you, though).

I wonder if FCW 2.0 will have a "email next of kin" option that triggers after it releases the brakes and sends the Jeep hurtling into the collision.
I think the key is that you need to touch the brakes in some capacity so the system knows you intend to stop the vehicle. If you do that and it determines you are not doing enough it adds necessary braking to try and prevent an impact.

if you are on the gas and you stay on the gas you are just going to get the beeping shuttering and that 1.5 second thing continue to stay on the gas after all that and you will plow into the car in front of you.

"If the driver does press the brake at any time during these steps and the system determines more brake force is required to avoid or mitigate the impact, the system will supplement additional brake force as required."

So there is that 4 step warn with minimal braking while you are on the gas and then if you do respond and touch the brakes the car wakes up and says ah he definitely does want to stop let me help and jumps on the brakes harder to meet the needs of the situation.

That is my understanding of it anyway
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