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Adaptive Cruise Control Stop-go

71K views 296 replies 61 participants last post by  Slowfoxtrot 
#1 ·
Just found out that European model will have stop and go feature, so the mules that were tested with stop and go we're actually for European spec vehicles. my dealer said that, they will not be available on launch vehicles but September/October deliveries..

When will parallel park feature be available on GC, Maybe MY15? Or not for this generation..
 
#255 · (Edited)
So why is this difference?

  • a different control module. If so, what is the new part number. Can it be replaced on the older vehicles?
  • a different calibration (firmware) of the same control module. If so, will it be available to the older vehicles and eventually installed by the dealer? Apparently not.
It is being discussed here. So yeah it went quietly into production in July. And Milous says the older ones are not upgradable. And Scottina says the SRTs are not getting it either due to issues with the brakes. What makes it not upgradable? Is it cost prohibitive? Assuming it is a module or a set of modeules, do(es) the new one(s) have extra sensors and extra wires and our current wiring architecture (harnesses et. al.) don't allow it?

I would like it broken down to part numbers, costs and their location (could be in the transmission or could be in the engine compartment) before I believe the not upgradable statement. Think about it, if it fails on one of the older cars say next year what are they replacing with? Parts that were produced during a short run, the year before, for 4 months or a current equivalent part? Look at people getting radios replaced. They are not getting theirs replaced with units made in April 2013 with the April UConnect 13.12 or 13.15 version either but rather new units with uconnect firmware that the rest of us cannot Download.

I would more readily believe the SRT brembo story than the inability to upgrade.
 
#256 ·
So why is this difference?

  • a different control module. If so, what is the new part number. Can it be replaced on the older vehicles?
  • a different calibration (firmware) of the same control module. If so, will it be available to the older vehicles and eventually installed by the dealer? Apparently not.
It is being discussed here. So yeah it went quietly into production in July. And Milous says the older ones are not upgradable. And Scottina says the SRTs are not getting it either due to issues with the brakes. What makes it not upgradable? Is it cost prohibitive? Assuming it is a module or a set of modeules, do(es) the new one(s) have extra sensors and extra wires and our current wiring architecture (harnesses et. al.) don't allow it?

I would like it broken down to part numbers, costs and their location (could be in the transmission or could be in the engine compartment) before I believe the not upgradable statement.
We don't have all of the parts information at this moment but, it is a completely different system. I am sure some of the components are "shared" but I know there were changes to the ABS system. Slowing down to a low speed vs stopping completely and starting going again require a different type of brake/throttle interaction.

Milous explains some of the differences between the 3 systems here :Jeep Grand Cherokee WK2 - Cruise Control

I am sure it is "possible" to upgrade the system as they are still working with the same electrical architecture... However you may be looking at many thousands of dollars as it is probably numerous different components such as the ABS Module plus all of the programming. I don't think anyone would even want to touch that project due to the safety aspects.

Anyway, as you will see by Milous' descriptions of the other system components, there will likely be some good detail to come in the future.
 
#259 ·
Sorry for thread resurrection!

Can anyone confirm or deny whether the 2015 SRT has the ACC with Stop feature? All the windows stickers I've seen for 2015 SRT's have "Adaptive Cruise Control with Stop" listed in standard features, the same as it's listed in Overlands with Tech Package, etc.

I haven't had the opportunity to test drive a '15 SRT yet and test the ACC for myself to see if it's been added and I can't find anyone else that's driven one either that can say for sure. Searching didn't turn up anything definitive.

Has anyone driven one and tested it out? Does it come to a complete stop or disengage >10MPH or whatever like before?

Thanks!
 
#260 ·
My 2014 diesel Summit has full working stop and go, so not sure why the 15 SRT wouldn't. It takes you to a complete stop and then accelerates by itself. The only limitation is it "times out" after around three seconds when completely stopped if the traffic hasn't begun to move again. This is for safety reasons of course.
 
#261 ·
Yeah that's the expected behavior on a non-SRT produced since late 2014. However, the SRT model apparently had issues with the Brembo brakes and therefore didn't have the full stop feature according to earlier posts in this thread. Wanted to confirm whether the 2015 SRT's had this resolved and now behave like your vehicle, or whether the 2015 SRT window stickers are all lying. :)
 
#263 ·
The question is for the 2015 SRT model...
 
#268 ·
I have just stumbled across this thread. We just purchased a 2014 SRT specifically wanting the safety features of forward collision warning with active braking to a stop and adaptive cruise control with stop. I am sad now. Has anyone ever successfully swapped the NH1 to a NH3? Even if it cost $1000 that would totally be worth it to us.

Thanks!
 
#271 ·
out of my league but here is a cursory overview of both NH1 and NH3 systems...it says it cannot be retrofitted but who knows...I know you would have to have the dealer get mothership to attach the new feature code to your VIN for updates and all to work properly and with such a liability attached to the feature mothership may be less than cooperative...who knows for sure tho...

Jeep Grand Cherokee WK2 - Cruise Control
 
#270 ·
Slofoxtrot, you may want to post these questions in the SRT forum area in addition to in this thread... ;)

My gut feeling is that what you want to do is a lot more complicated than just swapping out a module. Remember, these vehicles are all computer controlled and as they added features, that required updates beyond just control hardware. Even without the newer features you ask about, FCW and ACC will do a whole lot to make your ride potentially safer when somebody stupid does something stupid and gets in your way. They greatly speed up "your" response to the situation.
 
#278 · (Edited)
Remember, these vehicles are all computer controlled and as they added features, that required updates beyond just control hardware.

Even worse, they are a bunch of computers, networked together. After seeing how fast things went south with the systems in my ‘14 with no modifications, there is no way I’d suggest making changes without some serious engineering support, and probably not even then. Remember these systems are controlling your speed and brakes.
 
#272 ·
Its true we know that having FCW and ACC is better than nothing, but we would love for it to be able to go all the way to stop rather than turning off at 15 mph. I don't know where in the SRT forum I would even know to ask, this is the best thread I have found on this ACC w/stop feature. We are wondering if anyone has successfully done it. We are headed into our local jeep/dodge/chrylser dealership tomorrow morning and I'm wondering how I should posture our request for the feature?

Thanks!
 
#273 ·
yeah, dealer is not gonna have a clue and won't touch it with a 10 ft pole....it's not an off the shelf thing they can order/install and, therefore, simply won't do it even if they somehow knew how simply for liability....think of the lawsuit from an ACC/Stop issue as a result of them "altering a vehicle from the manufacturers original specifications...." I would not waste my time asking them.

This is not an SRT specific thing as this cuts across all trims...problem is the only real pool of folks who would want to try this are the 14 SRT and 14 other trims (built before 7/13/13)....good luck in your search...FWIW, I had a '14.5 Summit so I had the ACC w/ Stop and then got the 15 SRT so it was the same functionality and what I really want is stop and indefinite hold :thumbsup: so we will always want the newest iteration...it is immensely helpful in stop and go traffic....I still cover the brake tho...
 
#275 ·
I would be surprised if someone has done it. No single feature is worth a vehicle trade. I never had the NH1 but with a 15mph cut it certainly is good for cruising on the freeways. The stop is nice in slow traffic but with all the idiots cutting in and out I just cover the brake anyway...yes, more useful for sure.
 
#277 ·
not singularly...don't know how long you have had your 14 but if you are looking for upgrade excuses....16 gets rid of the power steering pump which gets you configurable drive modes, the new shifter., some lighter weight suspension components...then 17 gets the new front plus a faster chip radio....etc... :thumbsup:
 
#279 ·
I have a few questions:

For earlier vehicles with ACC without STOP
1) What is the minimum speed you can enable ACC ?
2) What is the speed at which the system deactivates: is it 15 mph or is it 20 mph ?

For vehicles with ACC with STOP:

1) What is the minimum speed you can enable ACC? Is it any speed or is it above 20 mph to activate and then it will slow down to a stop, up to 3 seconds stationary after which it disables itself, with the brakes on and holding the car?

Thanks
 
#280 ·
I have a few questions:

For vehicles with ACC with STOP:

1) What is the minimum speed you can enable ACC? Is it any speed or is it above 20 mph to activate and then it will slow down to a stop, up to 3 seconds stationary after which it disables itself, with the brakes on and holding the car?

Thanks
while 20 is the min ACC set speed you can actually turn on ACC cruise from your initial roll from stop so long as a vehicle is in front of you and moving also...the set speed just jumps to 20 and as you increase its set speed the ACC is working and accelerating you from the rolling stop to your 20+ set speed....during the 'w/stop" portion it releases the brakes after the timeout and have to apply brakes to stay put...you can then just hit resume when things start rolling again...I believe there was a promise of an indefinite hold capability as a 3rd iteration of ACC but it has not materialized yet TTBOMK....
 
#283 · (Edited)
Whelp we have our '14 SRT at the Jeep/Dodge/Chrysler dealership. They are claiming that the SRT owner's manual states that Forward Collision Warning with Mitigation and Adaptive Cruise Control (many times actually) they can bring the vehicle to a stop on their own without any driver interaction (autonomously). Especially considering the legal implications of the owners manual included with the vehicle describing the correctly functioning state of a safety system, the dealership is saying if the vehicle does not conform to it that they have to correct it.

To broaden the issue you could wonder if the vehicle does not conform to the described safety systems as described in the owners manual included with the vehicle what else could you possibly trust to be true or false?!? If there was a serious or fatal accident because of this misinformation dealing with safety systems how bad would that legal battle be? Of all the text in the owner's manual that has probably been reviewed by like thousands of their lawyers the safety systems have to be incredibly important.

Forward Collision Warning with Mitigation:
FCW monitors the information from the forward looking sensors as well as the Electronic Brake Controller (EBC), to calculate the probability of a forward collision. When the system determines that a forward collision is probable, the driver will be provided with audible and visual warnings and may provide a brake jerk warning. If the driver does not take action based upon these progressive warnings, then the system will provide a limited level of autonomous braking to help slow the vehicle and mitigate the potential forward collision.

Currently our Forward Collision Warning with Mitigation will actually not activate our brakes autonomously in any way. We would careen right into the back of the car in front of us with the system chirping and beeping merrily on its way to let us know what was happening as we die.

Adaptive cruise control in the manual uses the words "complete stop" "full stop" or "standstill" no less than 11 times. Ironically this is actually why we bought the Jeep. I figured I could trust the owner's manual until I read this forum! There is even an entire section dedicated to explaining how to use "ACC Operation At Stop." It states the ACC system will:

Will bring the vehicle to a complete stop while following a target vehicle and hold the vehicle for 2 seconds in the stop position.

If the ACC system brings your vehicle to a standstill while following a target vehicle, if the target vehicle starts moving within two seconds of your vehicle coming to a standstill, your vehicle will resume motion without the need for any driver action.

I guess we will see what the dealership comes up with.
 
#284 · (Edited)
"When" your MY14 was built makes a difference and there have been multiple versions of the owners' manuals, even in a single year. These capabilities were a "late add" to that model year; MY14 started rolling off production in early 2013 because of the mid-cycle refresh, but some features were not added until later. The ACC piece was one of them:

New: Adaptive Cruise Control with Stop and Go feature (late July 2013)
So if your build date was before that, you do not have the newer features for ACC and FCW
 
#286 ·
"When" your MY14 was built makes a difference and there have been multiple versions of the owners' manuals, even in a single year. These capabilities were a "late add" to that model year; MY14 started rolling off production in early 2013 because of the mid-cycle refresh, but some features were not added until later. The ACC piece was one of them:



So if your build date was before that, you do not have the newer features for ACC and FCW
I also checked that out and our build date was August 23, 2013. This about a month after the July cutoff for this feature and thus another reason why I thought we were good to go.
 
#285 ·
holy lord, a dealer actually thinks the owners manual is the gospel of truth....LMFAO :lol:...they are so inconsistent and inaccurate it is laughable....my '14 OM for my Summit fully described the operation of Lane Departure Warning (LDW), which it clearly never had....if your dealer wants to waste their and your time pursuing such a folly, well maybe they should read the inside cover of every OM:

"Chrysler Group LLC reserves the right to make changes in design and specifications, and/or make additions to or improvements to its products without imposing any obligation upon itself to install them on products previously manufactured."
 
#294 ·
Do you guys think there is any chance the dealership will be able to upgrade the SRT to the newer NH3 system?...
No

...Is that just a pipe dream?
Yes

...I wonder how they would break that news after everything they told us earlier today.
Bet they are hoping you don't come back and just forget about it. They'll make a call and be told the truth, not a feature on SRT until MY15.

However, kudos to the dealer since they were taking your side as the customer...that's refreshing.
 
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#297 ·
Ya well after several visits to their tech shop and hours of discussion with the branch manager of FCA for SLC we were basically told, “Uh we don’t know how to fix it, you’re out of luck.” I have never found a solution and have continued frustrated having my ACC shut off 10 times a day every day on my way home from work in stop and go traffic. Lol
 
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