Running JSCAN DASM - Sensor Calibration Init - Beta - to get Adaptive Cruise Control back.

[jahysea]

Jeep JL/JT.. DASM - Sensor Calibration Init - Beta... Has anyone ever completed this adaptation successfully in JSCAN? I've read that if you have any lift or bigger tires it basically doesn't work no matter how much vertical alignment of the sensor you attempt. I've learned (too late) that if you have a lift you should never run this feature, but unfortunately I already ran it and left my vehicle in a state that Cruise no longer works. No MIL, JSCAN advanced system scan reports that calibration is not learned and sensor adjustment is required.. I've vertically aligned the sensor multiple times to no avail. When you attemp to use adaptive cruise it reports "Adaptive Cruise Control (ACC) Unavailable Steep Grade" and when you attempt regular cruise it says "Cruise Unavailable Below Minimum Speed"... These things happen on flat ground at 75 so neither of those error conditions is actually applicable. This is a 2021 JLU with portals giving it a 4" lift and 40" tires. I have the gear ratio and tire size settings correct and my speedo is accurate. My steering wheel is also centered. Vehicle reports no errors other than this DASM alignment stuff per image below.

Considering temporarily returning vehicle to stock to run the feature but want a certain level of confidence that will work if I do so. So love to hear if this feature works in JSCAN for stock vehicles. Even better if folks have actually achieved success messing around with that alignment screw and passing that calibration with a lift and tires I'd love to hear about it. I posted this on the JSCAN facebook group but the JSCAN admin deleted my post.

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[roaniecowpony]

Why not simply let the air out of the tires?

 

[Das_Cheese]

Not sure what the story is with the fb group, but if I were you, I'd just send them an email. There's a time zone difference, with them being in poland, but they're generally super helpful.

 

[VKSheridan]

Why not just take it to Caliber Collision there in Napa and let them calibrate your ride properly?

 

[jahysea]

I reached out to JSCAN via FB messenger as they cite that as preferred on their website and I’ve done that successfully in the past. They did respond overnight and say the adaptation does run successfully on a stock jeep.

I didn't know "calibration shops" were a thing, I'll call that place in Napa.

Still haven't found any evidence this is possible with lift/tires.

I have access to 33" wheels/tires, I've already tried swapping just tires and doing this. The 4" of lift is what is really preventing success I suspect.

 

[jahysea]

I didn't know "calibration shops" were a thing, I'll call that place in Napa.

Caliber Collision place in Napa was super nice and helpful but they said they actually sub this work out to a company called Pro Tech and Pro Tech will absolutely not touch a lifted vehicle for liability reasons. The Caliber guy in Napa said it IS possible he believes to get calibration done with lift/tires but good luck finding someone to do it even if I'm willing to sign a waiver.

 

[jadmt]

I have a 2.5 AEV lift actual about 3.25" and 37's and my adaptive cruise works perfectly.

 

[ag4ever]

I have a 2.5 AEV lift actual about 3.25" and 37's and my adaptive cruise works perfectly.

This is a unique issue for 2025.5 and 2026 models. There was a change to the DASM that is causing a calibration issue.

Z Automotive has a module to override the issue, but it requires a working system to be the baseline.

 

[jadmt]

This is a unique issue for 2025.5 and 2026 models. There was a change to the DASM that is causing a calibration issue.

Z Automotive has a module to override the issue, but it requires a working system to be the baseline.

the OP said he has a 2021

 

[VKSheridan]

Caliber Collision place in Napa was super nice and helpful but they said they actually sub this work out to a company called Pro Tech and Pro Tech will absolutely not touch a lifted vehicle for liability reasons. The Caliber guy in Napa said it IS possible he believes to get calibration done with lift/tires but good luck finding someone to do it even if I'm willing to sign a waiver.

John, I’ve heard of California being a litigious state but I’m thinking the guy you talked to is terribly misinformed.

Calibration is binary. It either works or it doesn’t.

If your ride exceeds the factory parameters and the ride height cannot be redefined for the sensor, the calibration fails. There is no “liability” because it’s a pass/fail. If your lift is within range (usually up the 3” past factory), it’s an easy pass after adjustment.

Maybe give the guys at Pro Tech a call. His answer just doesn’t make sense.

Good luck!

 

[jahysea]

I have a 2.5 AEV lift actual about 3.25" and 37's and my adaptive cruise works perfectly.

Yea Adaptive Cruise working is the end goal but it isn't the real point here. It will work in any vehicle that thinks it's calibrated. We have a different JL with a 3" lift and 37's and ACC works fine on that one, but I'd never try and calibrate it knowing what I know now. ACC works but technically it's probably slightly off, never caused any probs.

 

[jahysea]

John, I’ve heard of California being a litigious state but I’m thinking the guy you talked to is terribly misinformed.

Calibration is binary. It either works or it doesn’t.

If your ride exceeds the factory parameters and the ride height cannot be redefined for the sensor, the calibration fails. There is no “liability” because it’s a pass/fail. If your lift is within range (usually up the 3” past factory), it’s an easy pass after adjustment.

Maybe give the guys at Pro Tech a call. His answer just doesn’t make sense.

Good luck!

Thanks Vince, ProTech won't work directly w me, they sub to shops only. I called a different shop in Concord and the guy did some research and called me back. They will attempt alignment with any vehicle that is within the height of any stock wrangler. So since the XR package is 35's and 2" lift, they will happily attempt if I can get the Jeep back to that total height, 3" above stock Rubicon. They don't care if the height comes from lift or tires, just what height that camera near the rearview mirror sits at. The guy thought it pretty unlikely that the vehicle would ever align correctly on the 6-7" of lift I have on it now and he certainly is not willing to try, for liability reasons.

Maybe there is a chance w the 33's it came with. If I found some 31's I'd be right at that 3".

 

[VKSheridan]

“Let’s try” is the answer I was hoping to hear. I’m pretty sure I could find you a shop here in Oklahoma or Texas that would not only give it a honest attempt without hesitation but would offer you a beer while you wait.

Once you raise it back up to 7” to 8” of lift, I’m not sure it’ll be accurate as the sensor angles won’t be pointed right.

Kinda like adjusting your headlights to be 100% in spec at stock height and then raising your ride 8” after you peel the tape off the wall. You’ll blind a giraffe doing that. To be accurate, calibration needs to be at the height it is to be used.

 

[ag4ever]

the OP said he has a 2021

Oops, my bad forgot 2021 on portals / 40s.

Im guessing there is no way to revert to the previous calibration without removing the portal boxes? I have never run the Jscan alignment tool, so don’t know the intricate details.

 

[roaniecowpony]

Oops, my bad forgot 2021 on portals / 40s.

Im guessing there is no way to revert to the previous calibration without removing the portal boxes? I have never run the Jscan alignment tool, so don’t know the intricate details.

40s have about 11" of sidewall. Letting the air out of the tires should lower it a lot. I let the air out of my front 37" tires to remove and replace my engine, specifically to clear the front bumper with an engine hoist that couldn't quite get the engine high enough.

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