[drwilki2]

Just picked up a Jeep Grand Cherokee Overland HEMI 4x4.

Do you have to enable adaptive cruise control in order for the Forward Collision Warning to work?

FCW works well when ACC is on and active on the highway, but not when you are just driving around normally and have the ACC off.

 

[JTS97Z28]

FCW is a system that is always on regardless of your cruise control status. Just try it, come up quickly to a car in front of you, it will start beeping at you ;-) I can't remember if FCW was something you can turn on or off, so if yours is for sure not working, then go through your options menu and make sure it's turned on.

 

[ColdCase]

Unless the 2014 works differently, FCW only turns on the "BRAKE" text in the EVIC and an audible alarm. It should work the same whether ACC is on or off. FCW does not actually brake the Jeep. Only ACC does that, but not at full braking.

 

[drwilki2]

Thanks. I have ACC completely off and the FCW on with the Far Setting enabled. However, nothing occurs.... I have tried nearly rolling into the back of another car on freeway and street roads multiple times and NOTHING happens. Really unfortunate too because this is brand new and there are less than 100 miles on the Jeep.

Guess its off to the dealership. Any idea what the repair time is on FCW and if they cover rental/loaner?

 

[2012 Summit]

Thanks. I have ACC completely off and the FCW on with the Far Setting enabled. However, nothing occurs.... I have tried nearly rolling into the back of another car on freeway and street roads multiple times and NOTHING happens. Really unfortunate too because this is brand new and there are less than 100 miles on the Jeep.

Guess its off to the dealership. Any idea what the repair time is on FCW and if they cover rental/loaner?

Do you have your foot lightly on the brake pedal while testing the FCW?

 

[lysol]

drwilki2, what you explain that you want to happen could be considered dangerous. You only want automatic braking when you are in a situation that cruise control permits i.e. on the highway. If you are on a back country road that has a right hand turn coming up but also has a left deceleration lane to turn left in the right turn, the FCW would alert you thinking that you are going to drive into the car that's slowing down. Now in this situation, you are in control of the car and any sudden braking not done by you would be dangerous. Now, this same scenario on a highway would be much safer but the Jeep is not smart enough to know what type of road you are on so they must set the braking option to be activated with the cruise control

I hope this makes sense. Also, another piece of information is that even though cruise control is off, you still get an audible warning, just no braking unless it's on.

 

[Snipe315]

Sounds like some folks are not sure how the FCW system works on the WK2.

With ACC Off:
FCW will Only Warn of a impending collision. It will provide a Visual and Audible warning but will not engage the brakes.

With ACC On:
FCW will warn of an impending collision (Audible & Visual) and will apply up to 25% of the maximum braking power if needed.

 

[2012 Summit]

Sounds like some folks are not sure how the FCW system works on the WK2.

With ACC Off:
FCW will Only Warn of a impending collision. It will provide a Visual and Audible warning but will not engage the brakes.

With ACC On:
FCW will warn of an impending collision (Audible & Visual) and will apply up to 25% of the maximum braking power if needed.

Not quite. FCW will not apply the brakes under any circumstances. ACC will apply up to 25% of the maximum braking power if needed. FCW does not have to be enabled for the ACC to apply the brakes. They are two separate systems although they do share the same sensor.

 

[2012 Summit]

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.

 

[drwilki2]

Thanks. FCW is definitely not working. No audible warning/No brake signs, even in the event of a near rear-ending.

Taking it into the nearest dealer on Monday for repair under warranty. Sadly, I have discovered other issues as well that need attention.

 

[2012 Summit]

Thanks. FCW is definitely not working. No audible warning/No brake signs, even in the event of a near rear-ending.

Taking it into the nearest dealer on Monday for repair under warranty. Sadly, I have discovered other issues as well that need attention.

Do you have your foot lightly on the brake pedal while testing the FCW?

 

[drwilki2]

Hi Summit... no i do not put my foot on the brake pedal until I am literally about to plow into the back of another vehicle. I've tried everything... FCW warning simply does not work at all which is really strange.

Now, to make matters stranger, FCW works fine if I am in ACC mode on the highway and a vehicle slams on its breaks in front of me... I'll get the 25% applied brake pressure and then audible/visual 'brake!' warnings which is nice.

 

[rovinrail]

Thanks. FCW is definitely not working. No audible warning/No brake signs, even in the event of a near rear-ending.

Taking it into the nearest dealer on Monday for repair under warranty. Sadly, I have discovered other issues as well that need attention.

The system's a bit smarter than you think. You're trying to test it, but most likely being cautious (as you should!). Just leave it alone, wait and see. I've had it alert me a handful of times in two years. Mainly for corners that it didn't like, but a couple of times for real things (idiot cutting into the passing lane/ idiot on bike deciding to swerve out across the road without looking).

Trying to outsmart it and race up to something won't work... it really is smarter than that

 

[bill_de]

Now, to make matters stranger, FCW works fine if I am in ACC mode on the highway and a vehicle slams on its breaks in front of me... I'll get the 25% applied brake pressure and then audible/visual 'brake!' warnings which is nice.

Isn't what you are describing all on account of the ACC. In the Jeep, the ACC applies the brakes, the FCW does not.
Also, the FCW only activates if you get too close for your current speed. Maybe you need to race toward that stopped semi.



---

 

[2012 Summit]

Hi Summit... no i do not put my foot on the brake pedal until I am literally about to plow into the back of another vehicle. I've tried everything... FCW warning simply does not work at all which is really strange.

Now, to make matters stranger, FCW works fine if I am in ACC mode on the highway and a vehicle slams on its breaks in front of me... I'll get the 25% applied brake pressure and then audible/visual 'brake!' warnings which is nice.

Sure sounds like it's not working properly. It is somewhat dangerous when testing, but you should definably be able to produce the collision warning notification.

Mine worked perfectly for the first 1500 miles or so. I was easily able to demonstrate it to friends. All of a sudden it stopped working. It was in for service 7 or 8 times and the dealer/Chrysler could not fix it. Chrysler even flew in an engineer to assist and still could not get it to work.

After I threatened legal action, Chrysler finally authorized the dealer to replace the front sensor and now it seems to be working. My problem started in March of 2012 and the sensor wasn't replaced until December 2012. What a hassle.

 

[drwilki2]

Back from dealer. Said it had no error codes so they wouldn't test it further. Sounds like this needs to be addressed to Chrysler so that we can get a TSB released. Lots of people have reported issues with FCW only working when ACC is on and not working otherwise.

 

[Roki303]

Was this ever addressed? Just picked up new Overland and have similar issues with FCW. ACC works fine but nearly plowed into rear of another car and have not seen any messages. Not sure if I'm doing something incorrectly or there is something wrong here.

 

[TitanFlyer]

I wonder (admittedly I have no idea) if this could be a UConnect issue. If its working in ACC and not in normal driving, then the sensor has to be working. All of those options for FCW to be near and far, brake on, or FCW on off are in UConnect. If there was a bug in that code it could be off and look like its on...

I thought mine wasn't working and I tested it by coming up on a car fast, but I obviously had to leave enough time to brake as I wasn't about to test it by plowing into another car. It wasn't until I was following someone and they pulled out into a turning lane and I just kept going as it was obvious that I wouldn't hit them, but if they had stayed in the same lane I would have. It warned me but didn't brake as the situation was resolved by then getting out of the way. I also thought it wasn't working, until it did... lol.

 

[Lankness]

I've had it come on twice, both within about 5 minutes of each other in traffic on Saturday. Which reminds me, don't take the SRT out on Saturday with the rest of the idiots...

In any case, 2 people pulled in front of me. I saw both and was moving from the accelerator to the brake, but the system was faster. I can tell you when it comes on and flashes brake/bings/etc. - it shuts the speed down fast. Both times you could hear ABS engage. Neither time was I even close to hitting the other vehicle, and neither time was the amount of braking done by FCW required. It is really aggressive on the SRT, could be from the brakes, not sure how aggressive it is elsewhere. I will take it though, it proved that it reacts quicker than I can. And, I'd rather it be aggressive than not enough (providing no one plows into the back of me).

 

[TitanFlyer]

I've had it come on twice, both within about 5 minutes of each other in traffic on Saturday. Which reminds me, don't take the SRT out on Saturday with the rest of the idiots...

In any case, 2 people pulled in front of me. I saw both and was moving from the accelerator to the brake, but the system was faster. I can tell you when it comes on and flashes brake/bings/etc. - it shuts the speed down fast. Both times you could hear ABS engage. Neither time was I even close to hitting the other vehicle, and neither time was the amount of braking done by FCW required. It is really aggressive on the SRT, could be from the brakes, not sure how aggressive it is elsewhere. I will take it though, it proved that it reacts quicker than I can. And, I'd rather it be aggressive than not enough (providing no one plows into the back of me).

Thats awesome, unless the guy behind you doesn't have manhole covers for discs and 99 piston brembo brakes like the SRT.. then you hope they have FWC as well.. lol