Collision Assist/Attention Assist
Thread Starter
Junior Member
Joined: Oct 2014
Posts: 29
Likes: 0
From: Northern NJ
2002 C240, 2015 C300
Collision Assist/Attention Assist
First question,
Has anyone had any experiences where your Collision Assist will beep at you when there's nothing in front of you? I'm afraid I'm going to get a random braking while I'm driving one day.
Second question,
Is Attention Assist standard? I can't really tell from what I've read. I didn't get the extra package with all of the driving safety features, though mine did come with Blind Spot Assist. I thought that was stupid and figured I'd check my own blind spot, but it's actually come in handy once or twice. I'm also wondering about attention assist because I figured maybe it's not Collision Assist that's beeping at me when there's nothing around and it's actually Attention Assist. I thought a coffee symbol popped up for this though.
Has anyone had any experiences where your Collision Assist will beep at you when there's nothing in front of you? I'm afraid I'm going to get a random braking while I'm driving one day.
Second question,
Is Attention Assist standard? I can't really tell from what I've read. I didn't get the extra package with all of the driving safety features, though mine did come with Blind Spot Assist. I thought that was stupid and figured I'd check my own blind spot, but it's actually come in handy once or twice. I'm also wondering about attention assist because I figured maybe it's not Collision Assist that's beeping at me when there's nothing around and it's actually Attention Assist. I thought a coffee symbol popped up for this though.
Junior Member
Joined: Nov 2014
Posts: 30
Likes: 0
2015 C400W4
I also have the Blind Spot Assist but not that Driver Assistance package. I found Attention Assist came disabled by default, and I was able to enable it. I have yet to hear any phantom beeping from Collision Assist though.
MBWorld Fanatic!
Joined: Oct 2014
Posts: 4,524
Likes: 1,181
From: WI
17 E43; 21 GLS580
First question,
Has anyone had any experiences where your Collision Assist will beep at you when there's nothing in front of you? I'm afraid I'm going to get a random braking while I'm driving one day.
Second question,
Is Attention Assist standard? I can't really tell from what I've read. I didn't get the extra package with all of the driving safety features, though mine did come with Blind Spot Assist. I thought that was stupid and figured I'd check my own blind spot, but it's actually come in handy once or twice. I'm also wondering about attention assist because I figured maybe it's not Collision Assist that's beeping at me when there's nothing around and it's actually Attention Assist. I thought a coffee symbol popped up for this though.
Has anyone had any experiences where your Collision Assist will beep at you when there's nothing in front of you? I'm afraid I'm going to get a random braking while I'm driving one day.
Second question,
Is Attention Assist standard? I can't really tell from what I've read. I didn't get the extra package with all of the driving safety features, though mine did come with Blind Spot Assist. I thought that was stupid and figured I'd check my own blind spot, but it's actually come in handy once or twice. I'm also wondering about attention assist because I figured maybe it's not Collision Assist that's beeping at me when there's nothing around and it's actually Attention Assist. I thought a coffee symbol popped up for this though.
Im not sure if all vehicles have attention assist but I think they do.
Senior Member
Joined: Mar 2009
Posts: 360
Likes: 5
From: Scarborough, Ontario
2020 CLA 250 4Matic Black
First question,
Has anyone had any experiences where your Collision Assist will beep at you when there's nothing in front of you? I'm afraid I'm going to get a random braking while I'm driving one day.
Second question,
Is Attention Assist standard? I can't really tell from what I've read. I didn't get the extra package with all of the driving safety features, though mine did come with Blind Spot Assist. I thought that was stupid and figured I'd check my own blind spot, but it's actually come in handy once or twice. I'm also wondering about attention assist because I figured maybe it's not Collision Assist that's beeping at me when there's nothing around and it's actually Attention Assist. I thought a coffee symbol popped up for this though.
Has anyone had any experiences where your Collision Assist will beep at you when there's nothing in front of you? I'm afraid I'm going to get a random braking while I'm driving one day.
Second question,
Is Attention Assist standard? I can't really tell from what I've read. I didn't get the extra package with all of the driving safety features, though mine did come with Blind Spot Assist. I thought that was stupid and figured I'd check my own blind spot, but it's actually come in handy once or twice. I'm also wondering about attention assist because I figured maybe it's not Collision Assist that's beeping at me when there's nothing around and it's actually Attention Assist. I thought a coffee symbol popped up for this though.
I am not sure if you have Parktonic, that can actually give you a false alarm during a snow or heavy rain/hail/sleet precipitation. As the snow or slushy material slides down in front of the sensor it will trigger both the visual and audio warnings. This has been the case for some time in my few MB experiences.
Collision Assist may give you that false alarm on some streets where your lane changes to a sharp turn to the right, the system momentarily sees the incoming car as being in front of you. It does not last too long.
Its a Red triangular warning along with the beep.
Attention Assist only gives you on my W204 a coffee cup symbol along with the written warning, on the W205 I am guessing it just says you need to take a break. I have never had it come on so I would have to check the manual to see if there is an audio alarm as well.
Thread Starter
Junior Member
Joined: Oct 2014
Posts: 29
Likes: 0
From: Northern NJ
2002 C240, 2015 C300
Thanks for the info. I'm guessing the random "false alarms" I've been seeing were Collision Assist related things. I do a lot of city driving so something must be setting it off.
Member
Joined: Oct 2014
Posts: 151
Likes: 1
From: Boston, MA
2015 C300 Luxury
First question,
Has anyone had any experiences where your Collision Assist will beep at you when there's nothing in front of you? I'm afraid I'm going to get a random braking while I'm driving one day.
Second question,
Is Attention Assist standard? I can't really tell from what I've read. I didn't get the extra package with all of the driving safety features, though mine did come with Blind Spot Assist. I thought that was stupid and figured I'd check my own blind spot, but it's actually come in handy once or twice. I'm also wondering about attention assist because I figured maybe it's not Collision Assist that's beeping at me when there's nothing around and it's actually Attention Assist. I thought a coffee symbol popped up for this though.
Has anyone had any experiences where your Collision Assist will beep at you when there's nothing in front of you? I'm afraid I'm going to get a random braking while I'm driving one day.
Second question,
Is Attention Assist standard? I can't really tell from what I've read. I didn't get the extra package with all of the driving safety features, though mine did come with Blind Spot Assist. I thought that was stupid and figured I'd check my own blind spot, but it's actually come in handy once or twice. I'm also wondering about attention assist because I figured maybe it's not Collision Assist that's beeping at me when there's nothing around and it's actually Attention Assist. I thought a coffee symbol popped up for this though.
There are two sensitivity settings, I have mine on sensitive. Only time it beeps at me are when I'm
A) Not braking and
B) It thinks I'm going to hit something
C) I'm trying to change lanes and Blind Spot light is on
Sometimes it thinks I'll hit the ground if the car goes up and down on a slopy road. Sometimes it thinks I'll hit a guard rail as I'm going around a curve very fast.
Thread Starter
Junior Member
Joined: Oct 2014
Posts: 29
Likes: 0
From: Northern NJ
2002 C240, 2015 C300
Attention assist is standard. No it does not randomly brake for you, it only does that for imminent collisions by preapplying brakes.
There are two sensitivity settings, I have mine on sensitive. Only time it beeps at me are when I'm
A) Not braking and
B) It thinks I'm going to hit something
C) I'm trying to change lanes and Blind Spot light is on
Sometimes it thinks I'll hit the ground if the car goes up and down on a slopy road. Sometimes it thinks I'll hit a guard rail as I'm going around a curve very fast.
There are two sensitivity settings, I have mine on sensitive. Only time it beeps at me are when I'm
A) Not braking and
B) It thinks I'm going to hit something
C) I'm trying to change lanes and Blind Spot light is on
Sometimes it thinks I'll hit the ground if the car goes up and down on a slopy road. Sometimes it thinks I'll hit a guard rail as I'm going around a curve very fast.
My second question was about Attention Assist. I wondered if that came standard and if it was possible that Collision Assist wasn't what I was hearing but if Attention Assist was. I'm thinking it's not and my car is detecting other things in the area. Attention Assist doesn't brake for you at all does it? It just keeps you alert?
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MBWorld Fanatic!
Joined: Oct 2014
Posts: 4,524
Likes: 1,181
From: WI
17 E43; 21 GLS580
Attention assist is standard. No it does not randomly brake for you, it only does that for imminent collisions by preapplying brakes.
There are two sensitivity settings, I have mine on sensitive. Only time it beeps at me are when I'm
A) Not braking and
B) It thinks I'm going to hit something
C) I'm trying to change lanes and Blind Spot light is on
Sometimes it thinks I'll hit the ground if the car goes up and down on a slopy road. Sometimes it thinks I'll hit a guard rail as I'm going around a curve very fast.
There are two sensitivity settings, I have mine on sensitive. Only time it beeps at me are when I'm
A) Not braking and
B) It thinks I'm going to hit something
C) I'm trying to change lanes and Blind Spot light is on
Sometimes it thinks I'll hit the ground if the car goes up and down on a slopy road. Sometimes it thinks I'll hit a guard rail as I'm going around a curve very fast.
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Member
Joined: Dec 2008
Posts: 86
Likes: 2
From: Ontario, CANADA
2015 C450; 2008 RX400h
No, it just measures a whole set of a parameters to see if you may be exhibiting signs or drowsiness. In my E class, it has gone off a couple of times, but never when I'm actually feeling tired, so I am not sure how well it works. In any event, on the E, you get beeps and a warning in the speedometer display and the coffee cup icon in the display also changes to red. I don't remember seeing the coffee cup icon in my test drives of the C, so I assume the display between the gauges would pop up the warning (which is to "Take a Break!").
Member
Joined: Jul 2014
Posts: 116
Likes: 1
From: Toronto Ontario Canada
2015 C400 4Matic
now that i read your post, it reminded me of a scary circumstance when i was driving my C400.
so basically I was in this two-lane freeway acceleration part with concrete columns (rails?walls?) on both side (road was under construction for expansion i suppose):
--------------------------------------------
- - [me
] - - - - - - - [ car A ]
------------------------------------------- (graphic not to scale)
- - [Car B ] - - - - - - - - - - -
---------------------------------------------
so I accelerated to this position and started signaling, i delayed just long enough to make sure i had sufficient passing space.
---------------------------------------------
- - - - - - - - [me] - [ car A ]
---------------------------------------------
- - [Car B ] - - - - - - - - - - -
---------------------------------------------
Then i decided to make the lane change with my nose almost sniffing Car A:
--------------------------------------------
- - - - - - - - - - - - - - - - - -[ car A ]
-------------------------------------------
- - [Car B ] - - - [me] - -
---------------------------------------------
But right after I have successfully entered the right lane, My C400 decided to give out the collision warning and hit the brake so hard while my foot was still pushing on gas .
Needless to say my speed dropped to 60km/h or so and scared the driver behind me so bad. and me? almost sht my pants and couldnt handle that death stare when Car B went past me while i was recovering speed.
I guess to him, all i did was accelerated infront of him and braked so hard almost to a stop.
I'm so not driving like this again with parktronic sensors on.
so basically I was in this two-lane freeway acceleration part with concrete columns (rails?walls?) on both side (road was under construction for expansion i suppose):
--------------------------------------------
- - [me
] - - - - - - - [ car A ]------------------------------------------- (graphic not to scale)
- - [Car B ] - - - - - - - - - - -
---------------------------------------------
so I accelerated to this position and started signaling, i delayed just long enough to make sure i had sufficient passing space.
---------------------------------------------
- - - - - - - - [me
] - [ car A ]---------------------------------------------
- - [Car B ] - - - - - - - - - - -
---------------------------------------------
Then i decided to make the lane change with my nose almost sniffing Car A:
--------------------------------------------
- - - - - - - - - - - - - - - - - -[ car A ]
-------------------------------------------
- - [Car B ] - - - [me
] - - ---------------------------------------------
But right after I have successfully entered the right lane, My C400 decided to give out the collision warning and hit the brake so hard while my foot was still pushing on gas .
Needless to say my speed dropped to 60km/h or so and scared the driver behind me so bad. and me? almost sht my pants and couldnt handle that death stare when Car B went past me while i was recovering speed.
I guess to him, all i did was accelerated infront of him and braked so hard almost to a stop.
I'm so not driving like this again with parktronic sensors on.
Senior Member
Joined: Jun 2009
Posts: 368
Likes: 0
B200T
now that i read your post, it reminded me of a scary circumstance when i was driving my C400.
so basically I was in this two-lane freeway acceleration part with concrete columns (rails?walls?) on both side (road was under construction for expansion i suppose):
--------------------------------------------
- - [me] - - - - - - - [ car A ]
------------------------------------------- (graphic not to scale)
- - [Car B ] - - - - - - - - - - -
---------------------------------------------
so I accelerated to this position and started signaling, i delayed just long enough to make sure i had sufficient passing space.
---------------------------------------------
- - - - - - - - [me] - [ car A ]
---------------------------------------------
- - [Car B ] - - - - - - - - - - -
---------------------------------------------
Then i decided to make the lane change with my nose almost sniffing Car A:
--------------------------------------------
- - - - - - - - - - - - - - - - - -[ car A ]
-------------------------------------------
- - [Car B ] - - - [me] - -
---------------------------------------------
But right after I have successfully entered the right lane, My C400 decided to give out the collision warning and hit the brake so hard while my foot was still pushing on gas .
Needless to say my speed dropped to 60km/h or so and scared the driver behind me so bad. and me? almost sht my pants and couldnt handle that death stare when Car B went past me while i was recovering speed.
I guess to him, all i did was accelerated infront of him and braked so hard almost to a stop.
I'm so not driving like this again with parktronic sensors on.
so basically I was in this two-lane freeway acceleration part with concrete columns (rails?walls?) on both side (road was under construction for expansion i suppose):
--------------------------------------------
- - [me
] - - - - - - - [ car A ]------------------------------------------- (graphic not to scale)
- - [Car B ] - - - - - - - - - - -
---------------------------------------------
so I accelerated to this position and started signaling, i delayed just long enough to make sure i had sufficient passing space.
---------------------------------------------
- - - - - - - - [me
] - [ car A ]---------------------------------------------
- - [Car B ] - - - - - - - - - - -
---------------------------------------------
Then i decided to make the lane change with my nose almost sniffing Car A:
--------------------------------------------
- - - - - - - - - - - - - - - - - -[ car A ]
-------------------------------------------
- - [Car B ] - - - [me
] - - ---------------------------------------------
But right after I have successfully entered the right lane, My C400 decided to give out the collision warning and hit the brake so hard while my foot was still pushing on gas .
Needless to say my speed dropped to 60km/h or so and scared the driver behind me so bad. and me? almost sht my pants and couldnt handle that death stare when Car B went past me while i was recovering speed.
I guess to him, all i did was accelerated infront of him and braked so hard almost to a stop.
I'm so not driving like this again with parktronic sensors on.
Yeah, I hear you on that...I'm scared of what the system would do to me as well.
This can be turned off though, on cars equipped with it, can it not?
Senior Member
Joined: Nov 2014
Posts: 457
Likes: 16
From: Columbus, GA
'25 MB GLE 450, w/airmatic
Brake Assist System (BAS) is a function in the Driver Assistance Package, which could have caused the unintended braking. This can be turned off.
I believe the Collision Prevention Asst comes standard, and it too could cause unintended braking. It can be turned off using the steering wheel controls.
I don't have my C300 yet, and I'm still reading the manual. So I could be wrong.
Now I'm wondering if you have dual systems readily available to cause automatic braking, is that a good thing?
Senior Member
Joined: Jun 2009
Posts: 368
Likes: 0
B200T
I think Distronic maintains a safe distance from the vehicle you are following, when you have the cruise control on.
Brake Assist System (BAS) is a function in the Driver Assistance Package, which could have caused the unintended braking. This can be turned off.
I believe the Collision Prevention Asst comes standard, and it too could cause unintended braking. It can be turned off using the steering wheel controls.
I don't have my C300 yet, and I'm still reading the manual. So I could be wrong.
Now I'm wondering if you have dual systems readily available to cause automatic braking, is that a good thing?
Brake Assist System (BAS) is a function in the Driver Assistance Package, which could have caused the unintended braking. This can be turned off.
I believe the Collision Prevention Asst comes standard, and it too could cause unintended braking. It can be turned off using the steering wheel controls.
I don't have my C300 yet, and I'm still reading the manual. So I could be wrong.
Now I'm wondering if you have dual systems readily available to cause automatic braking, is that a good thing?
So BAS, Lane Assist, Distronic...without the plus, they just notify. With Plus, BAS will do emergency braking, Lane Assist will keep you in your lane by braking one side's wheels, and Distronic will adjust speed, rather than just notify you when you get too close.
Still not sure if BAS Plus (the one that really scares me) can be deactivated or not.
BAS Plus: http://www.daimler.com/dccom/0-5-121...0-0-0-0-0.html
Member
Joined: Jul 2014
Posts: 116
Likes: 1
From: Toronto Ontario Canada
2015 C400 4Matic
You're right about the BAS. But to be more accurate, it's the BAS Plus. The regular (non-Plus) variants of the safety features only warn you, but do not take any action. At least the way I understood.
So BAS, Lane Assist, Distronic...without the plus, they just notify. With Plus, BAS will do emergency braking, Lane Assist will keep you in your lane by braking one side's wheels, and Distronic will adjust speed, rather than just notify you when you get too close.
Still not sure if BAS Plus (the one that really scares me) can be deactivated or not.
BAS Plus: http://www.daimler.com/dccom/0-5-121...0-0-0-0-0.html
So BAS, Lane Assist, Distronic...without the plus, they just notify. With Plus, BAS will do emergency braking, Lane Assist will keep you in your lane by braking one side's wheels, and Distronic will adjust speed, rather than just notify you when you get too close.
Still not sure if BAS Plus (the one that really scares me) can be deactivated or not.
BAS Plus: http://www.daimler.com/dccom/0-5-121...0-0-0-0-0.html
MBWorld Fanatic!
Joined: Oct 2014
Posts: 4,524
Likes: 1,181
From: WI
17 E43; 21 GLS580
All the cars stop on their own, that's the collision mitigation system. Distronic is the self following system, the plus is the pedestrian recognition system. I know, a lot of acronyms, with feature that overlap. The easiest way to figure it out is to know how they work. Distronic is a basicly a radar system . The lane keeping assist is a visual system. The plus in distronic is the addition of the cameras as a visual recognition system. The collision mitigation system uses the distronic radar to function. Hope this helps, I had to read the darned thing multiple times to figure it out. There are also additional radar receivers beneath the bumpers for the blind spot system, I think ( this one is the one I haven't completely) they also control the cross traffic system.
Last edited by c4004matic; Nov 26, 2014 at 12:08 AM.
MBWorld Fanatic!
Joined: Sep 2014
Posts: 1,822
Likes: 33
From: Whitefield, NH
2015 C300 Sport: Palladium, Premium, Multimedia, Leather, BLIS
Junior Member
Joined: Mar 2019
Posts: 42
Likes: 23
e400 wagon
Hi All,
I started a thread so we can get a head count on people with this issue, across different platforms. If your car's having this problem, please post here:
https://mbworld.org/forums/mercedes-...ml#post7833418
I started a thread so we can get a head count on people with this issue, across different platforms. If your car's having this problem, please post here:
https://mbworld.org/forums/mercedes-...ml#post7833418
Junior Member
Joined: Mar 2019
Posts: 42
Likes: 23
e400 wagon
MBWorld Fanatic!
Joined: Nov 2003
Posts: 2,413
Likes: 497
From: Earth
2015 C300 4Matic Sport
now that i read your post, it reminded me of a scary circumstance when i was driving my C400.
so basically I was in this two-lane freeway acceleration part with concrete columns (rails?walls?) on both side (road was under construction for expansion i suppose):
--------------------------------------------
- - [me] - - - - - - - [ car A ]
------------------------------------------- (graphic not to scale)
- - [Car B ] - - - - - - - - - - -
---------------------------------------------
so I accelerated to this position and started signaling, i delayed just long enough to make sure i had sufficient passing space.
---------------------------------------------
- - - - - - - - [me] - [ car A ]
---------------------------------------------
- - [Car B ] - - - - - - - - - - -
---------------------------------------------
Then i decided to make the lane change with my nose almost sniffing Car A:
--------------------------------------------
- - - - - - - - - - - - - - - - - -[ car A ]
-------------------------------------------
- - [Car B ] - - - [me] - -
---------------------------------------------
But right after I have successfully entered the right lane, My C400 decided to give out the collision warning and hit the brake so hard while my foot was still pushing on gas .
Needless to say my speed dropped to 60km/h or so and scared the driver behind me so bad. and me? almost sht my pants and couldnt handle that death stare when Car B went past me while i was recovering speed.
I guess to him, all i did was accelerated infront of him and braked so hard almost to a stop.
I'm so not driving like this again with parktronic sensors on.
so basically I was in this two-lane freeway acceleration part with concrete columns (rails?walls?) on both side (road was under construction for expansion i suppose):
--------------------------------------------
- - [me
] - - - - - - - [ car A ]------------------------------------------- (graphic not to scale)
- - [Car B ] - - - - - - - - - - -
---------------------------------------------
so I accelerated to this position and started signaling, i delayed just long enough to make sure i had sufficient passing space.
---------------------------------------------
- - - - - - - - [me
] - [ car A ]---------------------------------------------
- - [Car B ] - - - - - - - - - - -
---------------------------------------------
Then i decided to make the lane change with my nose almost sniffing Car A:
--------------------------------------------
- - - - - - - - - - - - - - - - - -[ car A ]
-------------------------------------------
- - [Car B ] - - - [me
] - ----------------------------------------------
But right after I have successfully entered the right lane, My C400 decided to give out the collision warning and hit the brake so hard while my foot was still pushing on gas .
Needless to say my speed dropped to 60km/h or so and scared the driver behind me so bad. and me? almost sht my pants and couldnt handle that death stare when Car B went past me while i was recovering speed.
I guess to him, all i did was accelerated infront of him and braked so hard almost to a stop.
I'm so not driving like this again with parktronic sensors on.
- If I have the follow distance set to the closest distance and I am moving very fast towards stopped vehicles, the Distronic Plus doesn't seem like it will slow down, until the last second. (I haven't found the courage to test if the car will actually slow down in time, I just start braking manually)
- The Distronic Plus acts weird if a car suddenly cuts me off and moves into my lane. (I always turn it off if I see another car is very close and trying to move into my lane)
- The Distronic Plus acts weird if a car in front suddenly leaves my lane and another car is stopped ahead.
- The Active Lane keeping assist sometimes actives when another car is right next to me and makes them think I am being aggressive and trying to swerve into their lane.
- I always turn off Distronic Plus if I am changing lanes and cars are close (to avoid any random braking issues).
- When turning at the light, my car might beep twice if the car in the other lane seems to be too close.
- If I activate Distronic Plus (going about 50) and I press the gas pedal to speed up (to maybe 70), when I release the gas pedal, the Distronic Plus will reengage and brake hard to get back to the slower speed. It's not gentle about it. (I always turn it off If I want to speed up and pass someone)
- The car will suddenly beep and alert me randomly and when I look around I see nothing wrong. (my guess is 268 or 253 alerts)
- The pre-safe brake saved me when a another driver changed lanes and stopped suddenly in front of me. I braked hard, but the car took over in the last second.
Last edited by benzdude; Sep 6, 2019 at 06:34 PM.
