S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

Active Lane Keep Assist with Distronic Plus

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Old Sep 15, 2023 | 05:10 PM
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2013 Altima, 2011 E550
Active Lane Keep Assist with Distronic Plus

Hey all,

In the market for a W221 and this is one of my last questions to be figured out before making a purchase.

Was active lane keep assist ever an option on the W221? By active I mean it has a servo that can physically turn the wheel to keep the vehicle centered in the lanes.

If this does exist, what would I look for to know if a W221 has it?

What would I look for to determine if the car has Distronic Plus?

Thank you!
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Old Sep 15, 2023 | 05:51 PM
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Originally Posted by mgiara
Hey all,

In the market for a W221 and this is one of my last questions to be figured out before making a purchase.

Was active lane keep assist ever an option on the W221? By active I mean it has a servo that can physically turn the wheel to keep the vehicle centered in the lanes.

If this does exist, what would I look for to know if a W221 has it?

What would I look for to determine if the car has Distronic Plus?

Thank you!
I have a 2012 W221. It has Distronic Plus and what I think is called the active lane keep assist. I don't know if it actually was part of the Driver Assist Package that also included the Distronic, but I think it was so if the car has Distronic it also has the lane keep.

This lane keep in my car is not a servo doing steering. It is made by applying front brake to pull car back in the lane. Later car models may/probably have active steering that actually steers the car to keep it in the traveling lane.

It is easy to find if the car has Distronic. The front grille has a square middle part that has "painted" lines to match the slats in the grille or if it has round big star it has solid cover on it. Opening the hood will reveal the Distronic radar sensor. It is right in the open in the middle of the radiator when hood is up.
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Old Sep 16, 2023 | 05:18 AM
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S500
only the very last ones got it - I guess they had it ready for the 222 and it landed on the last high end 221s

earlier ones don't get it - and of course ONLY cars that have the rare option of Distronic Plus (active cruise control)

use a chassis decode tool and check for
238 - ACTIVE LANE KEEPING ASSIST (FAP)
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Old Sep 16, 2023 | 08:48 AM
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04 E55 AMG (totaled), 07 S550 4Matic, 14 E63S
I think the next gen Distronic Plus with Active Steering Assist debuted on the W222 in 2014 (and was available in the facelifted W212 in the same year and also the W205 around 2015).
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Old Sep 16, 2023 | 11:22 AM
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its warning only from 2011 see page 354 and a stab on a brake in the hope its keeps it in lane

https://www.carmanualsonline.info/me...ch=Lane+assist

Active Lane Keeping Assist monitors the area
in front of your vehicle by means of a camera
at the top of the windshield. Active Lane
Keeping Assist detects lane markings on the
road and warns you before you leave your
lane unintentionally. If you do not react to the
warning, a lane-correcting application of the
brakes can bring the vehicle back into the
original lane.
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Old Sep 16, 2023 | 02:39 PM
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Originally Posted by BOTUS
only the very last ones got it - I guess they had it ready for the 222 and it landed on the last high end 221s

earlier ones don't get it - and of course ONLY cars that have the rare option of Distronic Plus (active cruise control)

use a chassis decode tool and check for
238 - ACTIVE LANE KEEPING ASSIST (FAP)
My 2012 221 was made in 2011 and it has the active lane keep. This IS NOT the Active Steering that new cars have. Mine just applies brake on the opposing front wheel for a split of time to bring the car back on the lane. And it works really well unless the camera cannot see the lane markings...
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Old Oct 4, 2023 | 06:04 AM
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Class S 500 M278
I have a S500 early '11 - with the full driver assistance package, including the active lane keeping assist and a lot more.
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Old Oct 13, 2023 | 12:17 AM
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Thank you everyone!!
Phenomenal information!!!
Very much appreciated.
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