Driving -> Collision settings
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Joined: May 2025
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Driving -> Collision settings
How do you prefer to set the following Driving -> Collision settings?
- Active brake assist (Early/Medium/Late)
- Active lane keeping assist
- Advanced lane keeping assist (when line markings aren't clear.)
- Close range braking (on/off)
Senior Member
Joined: Apr 2018
Posts: 421
Likes: 242
From: Austin, TX / Munich, DE
E 53 Wagon
I have my car using the defaults for the Collision settings.
This week, I turned off Close Range Braking. She has slammed on the brakes twice now in situations where I felt there was no immediate danger of impacting something. First, I was backing into a parking slot at work with a charging station. The charging dispenser has two pylons surrounding it, and I'm assuming it saw the closest one as a threat. Second, I was backing out of the garage at a paintless dent repair facility. I was meters away from any obstacle. I'm not sure if removing the bumper to attempt said PDR was the culprit, but the car was scanned after, and no faults. Both times were after the bumper removal, so I'm curious if there's a correlation. (Also terrifies me that I may need a new bumper after all.)
I do want to turn it back on.
This week, I turned off Close Range Braking. She has slammed on the brakes twice now in situations where I felt there was no immediate danger of impacting something. First, I was backing into a parking slot at work with a charging station. The charging dispenser has two pylons surrounding it, and I'm assuming it saw the closest one as a threat. Second, I was backing out of the garage at a paintless dent repair facility. I was meters away from any obstacle. I'm not sure if removing the bumper to attempt said PDR was the culprit, but the car was scanned after, and no faults. Both times were after the bumper removal, so I'm curious if there's a correlation. (Also terrifies me that I may need a new bumper after all.)
I do want to turn it back on.
Junior Member
Joined: May 2024
Posts: 48
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Soon to be e class
I set it to medium by default, and set it to late when I know I am not tired, or Visability isn’t compromised (contrary to popular opinion perhaps).
I do have the more advanced drivers assist package (forgot the official name). I also have lane change assist fully off.
I never use early for the brake setting and wouldn’t recommend except for really novice drivers who tend to unintentionally tail gate drivers without realizing or having the skills and driving talent to modulate the vehicle to avoid/mitigate a collision or disaster.
I do have the more advanced drivers assist package (forgot the official name). I also have lane change assist fully off.
I never use early for the brake setting and wouldn’t recommend except for really novice drivers who tend to unintentionally tail gate drivers without realizing or having the skills and driving talent to modulate the vehicle to avoid/mitigate a collision or disaster.
Out Of Control!!
Joined: Nov 2018
Posts: 11,632
Likes: 5,454
From: San Francisco Bay Area
2019 C63CS
FYI...the Active brake assist early/medium/late setting doesn't control when it slams on the brakes. It only controls how early you get the visual and acoustic warning. Setting it to Late means the warning will likely be immediately followed by slamming the brakes, where as Early means you get the warning with enough advanced warning before it slams on the brakes, so you can react and avoid the brake slamming.
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Joined: May 2025
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FYI...the Active brake assist early/medium/late setting doesn't control when it slams on the brakes. It only controls how early you get the visual and acoustic warning. Setting it to Late means the warning will likely be immediately followed by slamming the brakes, where as Early means you get the warning with enough advanced warning before it slams on the brakes, so you can react and avoid the brake slamming.
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g
I read on the Acura MDX forum in 2022 of a person who had the front bumper repaired in the port before delivery. He was having false positive detections from the front. I saw on the NTHSA forum that people were reporting MDX's for unnecessary braking interventions, especially when driving on the highway, where the car would decide to slam on the brakes from highway speeds. I was wondering if prior collisions were affecting the sensors, or if there is a software or hardware issue with the MDX.
If removing the bumper or a hit to the bumper changed the positioning of the sensors, I could see how you might get false positives. It doesn't seem like you would get false positives only by removing and then re-attaching the bumper.
Since the false positives only occurred after the bumper removal, I would certainly question if there were a causal relation.
I have my car using the defaults for the Collision settings.
This week, I turned off Close Range Braking. She has slammed on the brakes twice now in situations where I felt there was no immediate danger of impacting something. First, I was backing into a parking slot at work with a charging station. The charging dispenser has two pylons surrounding it, and I'm assuming it saw the closest one as a threat. Second, I was backing out of the garage at a paintless dent repair facility. I was meters away from any obstacle. I'm not sure if removing the bumper to attempt said PDR was the culprit, but the car was scanned after, and no faults. Both times were after the bumper removal, so I'm curious if there's a correlation. (Also terrifies me that I may need a new bumper after all.)
I do want to turn it back on.
This week, I turned off Close Range Braking. She has slammed on the brakes twice now in situations where I felt there was no immediate danger of impacting something. First, I was backing into a parking slot at work with a charging station. The charging dispenser has two pylons surrounding it, and I'm assuming it saw the closest one as a threat. Second, I was backing out of the garage at a paintless dent repair facility. I was meters away from any obstacle. I'm not sure if removing the bumper to attempt said PDR was the culprit, but the car was scanned after, and no faults. Both times were after the bumper removal, so I'm curious if there's a correlation. (Also terrifies me that I may need a new bumper after all.)
I do want to turn it back on.
If removing the bumper or a hit to the bumper changed the positioning of the sensors, I could see how you might get false positives. It doesn't seem like you would get false positives only by removing and then re-attaching the bumper.
Since the false positives only occurred after the bumper removal, I would certainly question if there were a causal relation.
Thread Starter
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Joined: May 2025
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It would be interesting to test advanced lane keeping assist where the lines aren't clear, but I'm not sure where to do so or even what the conditions are when the car tries to figure out unclear lane markings.
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Thread Starter
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I changed active brake assist warning from medium to early. Today it warned when a car slowed down in front of me. I didn't need to take action, but it was good to be aware of a possible situation coming up. I'm going to keep it on "early" for a while longer to try it out.
My prior car would alert every time on a tree that is in front of a curve near my house. The W214 doesn't false alarm on the tree. I'm not sure how they fixed it, but it is an improvement.
My prior car would alert every time on a tree that is in front of a curve near my house. The W214 doesn't false alarm on the tree. I'm not sure how they fixed it, but it is an improvement.
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Joined: Dec 2011
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W212 FL
On my W212 , sometimes when no one is around it still alerts me along with a red triangle on the dash . For W214s , I have not tested it yet but nice to see an improvement which I would have been expecting as well. A guy advised that the driver should slightly tap on the brakes to avoid the car slamming into the brakes when it detects the objects as a danger . In theory , it should work given the fact that the car acknowledges the driver is aware of the danger and takes a reaction . I don't know it if works but I will try it later
Last edited by BenzV12; Jan 20, 2026 at 02:19 AM.
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Joined: Aug 2014
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From: Tennessee
W214 E450
On my W212 , sometimes when no one is around it still alerts me along with a red triangle on the dash . For W214s , I have not tested it yet but nice to see an improvement which I would have been expecting as well. A guy advised that the driver should slightly tap on the brakes to avoid the car slamming into the brakes when it detects the objects as a danger . In theory , it should work given the fact that the car acknowledges the driver is aware of the danger and takes a reaction . I don't know it if works but I will try it later
Edit: Found it.
https://mbworld.org/forums/e-class-w...avoidance.html
https://mbworld.org/forums/e-class-w...ist-works.html
Last edited by L1Wolf; Jan 20, 2026 at 12:05 PM.
Junior Member
Joined: Jun 2021
Posts: 52
Likes: 16
From: DC Area
2026 e350
I have the collision settings set to default, medium. I haven’t had an instance yet where it’s gone off, but I’ve only had my new Mercedes for two weeks. This “advanced” active late assist, I find it very intermittent. Only seems to keep me in a lane about half the time. I can’t find correlation between markings on a road, when it will work and won’t.
