Adaptive cruise and lifts with bigger tires?

stumblinhorse · Mar 28, 2022

I thought i would start a thread to talk about an issue that many new 392 owners might not know about. There are so many newbies here that I wanted to make sure they are aware of this important fact.

When you have adaptive cruise control, ACC, and you replace your windshield, happens a lot with a Jeep, you impact the safety features and the installer must deal with those systems. All 392s have ACC. Once your Jeep is lifted with, for example 37s, a recalibration “might” be required to make ACC and the safety features work. That recalibration will fail because of the new height of the JL. A dealer will then need to get involved because of the codes that are thrown.

I wanted to hear if anyone has run into this or are people making sure to discuss with the windshield installer ahead of time on what to do?

Viking Jeeper · Mar 28, 2022

ACC is not a safety feature, its a lazy feature.

stumblinhorse · Mar 28, 2022

Viking Jeeper said:
ACC is not a safety feature, its a lazy feature.

Agreed, never had it on any vehicle before this one. But it will throw a code if you have your windshield replaced and have a lift on your 392.

Yaak392 · Mar 29, 2022

First....
I don't know.
But in back in the area that holds the Jack and stuff is a dust cover for the ACC. In the event that you want to drop the windshield. .... I think that has meaning. So you can drop the windshield, go play, and then raise the windshield back in to place and everything is back to normal?

stumblinhorse · Mar 30, 2022

Yaak392 said:
First....
I don't know.
But in back in the area that holds the Jack and stuff is a dust cover for the ACC. In the event that you want to drop the windshield. .... I think that has meaning. So you can drop the windshield, go play, and then raise the windshield back in to place and everything is back to normal?

It is the ”back to normal” that becomes the issue. ACC is programmed to be at a certain height. If it is out of spec it will fail to come back on line. I think this will become a well known issue soon, as more ACC Jeeps get delivered and lifted and broken windshields.

BenLandry · Mar 30, 2022

stumblinhorse said:
It is the ”back to normal” that becomes the issue. ACC is programmed to be at a certain height. If it is out of spec it will fail to come back on line. I think this will become a well known issue soon, as more ACC Jeeps get delivered and lifted and broken windshields.

Some windshield repair shops have the equipment to recalibrate that system after replacement. My windshield is cracked horizontally all the way from top to bottom. I’m waiting to lift it before i replace for that reason.

frankorego · Mar 30, 2022

BenLandry said:
Some windshield repair shops have the equipment to recalibrate that system after replacement. My windshield is cracked horizontally all the way from top to bottom. I’m waiting to lift it before i replace for that reason.

I just replaced mine. I added the Teraflex pucks to the coils and put 35s with no errors. So there must be some tolerance that it will accept. When they replaced the windshield I was miffed to find out about the "recalibration". The windshield was about 650 and the recalibration was 250 at Safelite in Hampton, VA.

stumblinhorse · Mar 30, 2022

I bet it has a tolerance, not sure where it is. I am sure we will soon find out.

@frankorego did you “have to” get recalibrated? Does every time the windshield get replaced does it need recalibration? Or did pucks and 35s throw it out?

jandersendo · Mar 30, 2022

So what you're saying is after someone gets a lift installed they might have to go to the dealer to get the ACC system recalibrated?

Doesn't sound like a big deal to me

stumblinhorse · Mar 30, 2022

jandersendo said:
So what you're saying is after someone gets a lift installed they might have to go to the dealer to get the ACC system recalibrated?

Doesn't sound like a big deal to me

Actually there is talk out there that it won’t recalibrate at all if too tall/out of spec.

frankorego · Mar 30, 2022

stumblinhorse said:
I bet it has a tolerance, not sure where it is. I am sure we will soon find out.

@frankorego did you “have to” get recalibrated? Does every time the windshield get replaced does it need recalibration? Or did pucks and 35s throw it out?

Recalibration was a requirement according to safelight for the windshield replacement. No calibration after the tires and pucks and no warnings or malfunctions for over 10 months.

stumblinhorse · Mar 30, 2022

So then, I think recal is required with all replacements and will fail at a certain lift height…

frankorego · Mar 31, 2022

stumblinhorse said:
So then, I think recal is required with all replacements and will fail at a certain lift height…

That's what it sounds like. Not sure what that threshold for lift is mine is approximately 1.5 inches.

cgr · Mar 31, 2022

I have not had the windshield replaced on the 392, but I have on my daughter's 21 sahara with advanced safety package (acc). I checked on this very issue. Because the camera equipment is housed and not "connected" to windshield, there is no need for recalibration after windshield replacement. Hers is not lifted but has my 392 wheels and tires, so not stock height. Did not present issue with wheels and tires, and did not present issue after windshield was replaced. The reasoning was provided by the company doing the windshield replacement which does perform the recalibration on vehicles needing it. Someone already made the point of the dust cover provided for dropping windshield as well. Hope this info helps.
Chris

stumblinhorse · Mar 31, 2022

@cgr thanks! So it sounds like recalibration is not required and we should push back if the windshield place is pushing for it. That is good info.

cgr · Mar 31, 2022

stumblinhorse said:
@cgr thanks! So it sounds like recalibration is not required and we should push back if the windshield place is pushing for it. That is good info.

That would be my opinion. Actually, I asked this very question after the windshield was replaced. I was afraid that I had missed something that was needed. I cannot say that I have "tested" anything in her jeep, but definitely no codes. Would definitely be worth knowing if anyone has insider connections as to how the actual system functions. This conversation has got me thinking about how the braking assist functions if stock height has been modified. Surely, there is a range the camera functions within. Yeah, I know, don't call me Shirley...
Chris

frankorego · Apr 1, 2022

stumblinhorse said:
@cgr thanks! So it sounds like recalibration is not required and we should push back if the windshield place is pushing for it. That is good info.

This was my thought as well. I even asked the tech at Safelite If I have to bring my jeep in every time I fold the windshield down and up for a recalibration. He said, "of course not that would be silly". I respond "exactly my point! Why do I have to pay for a recalibration then if you simply replaced the windshield with a new factory windshield?" No asnwer. Please pay the bill if you want your jeep back! No more Safelite for me!

Guest862 · Apr 1, 2022

President/CEO of Safelite is a guy named Tom. Feeney @ safelite.com
Friendly enough and have had some 1:1s with him. He is big in Ohio for charitable giving and partnership with charities. I don’t know I’ll connect with him any time soon but he was amicable enough the couple times I’ve talked to him.

frankorego · Apr 1, 2022

HEAT392 said:
President/CEO of Safelite is a guy named Tom. Feeney @ safelite.com
Friendly enough and have had some 1:1s with him. He is big in Ohio for charitable giving and partnership with charities. I don’t know I’ll connect with him any time soon but he was amicable enough the couple times I’ve talked to him.

Merci. Sent an email.