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Dear PRO, do you know what types of passenger sensors in the front passenger seat could be for W221? Also is it the same thing as child seat detection sensor or it's a separate sensors?
In US W221 comes with “scales” that literally weigh the mass of the passenger (4 sensors + 1 CU) - It's most likely called WSS.
In Europeans, they comes like a mat witch looks like a big flex.
But the Xentry/DAS offers more than 2 options to choose from + a “sensor not installed” option
Do you know what each options means?
And the second question for cars without these sensors at all, is it possible to enable passenger belt warning? If yes, how does the control module understands that the passenger is present?
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I don't know / unsure but could SBR be Seat Belt Recognition... on many cars it used to be the seat belt buckle clipped in that told the car the seat was in use
how about
Start OC / AKSE (+ Kennung) = Use Occupancy Check or Automatische KinderSitzErkennung (Automatic child seat recognition) Identifier
as Kennung = identifier
got to love mixes of company names and two different languages all in one
well.... in a list of Merc acronyms I had, seems its been used as Jaap already suggested as seat belt extender
but an independent generic car technical acronym list I just found
SBE Sitzbelegungserkennung - in english is Seat occupancy detection
Sitz, in english Seat
Belegung, in english is occupancy
Kennung in translate tools shows directly as "identifier" - but looks in this case as if it should translate as "detection" where Erkennung = Detection
so at this rate is SBR the generic term Merc use to talk about the whole sequence of possible madness to understand IF, WHERE and how HEAVY a person is
Thank you! Now it's more less clear ))) But how SBR actually works and is it a sensor? The issue is my car is not equipped with neither a "mat" (SBE/OC) or WSS. But still DAS doesn't show "Not equipped". It shows SBR. So I wondering what is that how it actually works.
The problem is when I reset SRS block and re-enable it - it goes trough a test of this occupancy sensors but it doesn't react if someone sits there or not. With that there is no errors. To better understand what is going on I looking for more information on what is SBR and how it works.
European airbags are one small size and pop based on the crash being big enough to send the signal to the air bag to go pop
Because human rights matter, many Americans choose to void their rights to live by leaving off the one component that will save their life in a crash - the seat belt (which was designed to be an integral part of the crash safety systems the car was built with). To help find and make the body recognisable after death we fit far larger air bags in USA cars. However this larger air bag instantly kills or subsequently smothers those of a smaller stature who initially survived the crash because they used their seat belt (like the car designers intended) - so we add more complexity to USA cars to try and unravel the mess
Well yes US systems are more complicated. While EU just have "a big antenna", the US version has real scales and it determines the weight of passenger and thus know if there a child or big boss)
Well back to my case when I reset and re-enable/re-learn AB (SRS) module it ask me to pass passenger occupancy sensor test and it does not react when I sit there and also doesn't react when I plug the seat belt. However when I go to realtime data of the seat it shows me when seat belt is in or out - it means there is no issue with seat belt lock. Thus I am trying to understand why SRS wants to check occupancy while there is no sensor installed, why it doesn't see if belt is plugged, and what the difference in case of crash if seat belt is plugged or not.
Also as I understand there is no way to enable passenger non-plugged seat belt sound warning because there is no sensor in the seat.
it was normal on Mercs to have issues with occupancy - not sure why, but I thought its usually the passenger one that fails - I thought it was the seat belt stalk switch / connection that fails - but these days some try to be more clever and when the car doesn't know what's going on it throws the Air bag light
so from description in the post below - its throws the error when the occupancy detection is broken to inform you it will fire the airbag no matter what (in a crash), as it can't be sure there is no one there - and the warning light is to say don't leave your kid there when the car's broken as they'll die
Seat occupancy detection, also known as SBE, is usually present in new vehicles, but can also be installed additionally and serves to ensure safety on the road. It detects a person in any seat position and at the same time prevents the front and side airbags on the passenger side from being triggered if the seats are empty. In the event of a system failure, the airbag is always actively switched on.
You are referring to SBE but my one has SBR... Still do not understand how it works or how it should work. I about this part:
When I reset and re-enable/re-learn AB (SRS) module it ask me to pass passenger occupancy sensor test and it does not react when I sit there and also doesn't react when I plug the seat belt. However when I go to realtime data of the seat it shows me when seat belt is in or out - it means there is no issue with seat belt lock. Thus I am trying to understand why SRS wants to check occupancy while there is no sensor installed, why it doesn't see if belt is plugged, and what the difference in case of crash if seat belt is plugged or not.
Also as I understand there is no way to enable passenger non-plugged seat belt sound warning because there is no sensor in the seat.
if you clip in a baby seat with the seat belt - then seat belt recognition won't help - but on most cars when doing this you manually disable with an airbag switch
FYI just made this up.... maybe
Sitzplatzbelegungsrechbar - Seat occupancy can be calculated
The seatbelt remains the single-most important item of safety equipment in the car. Without it, occupants are unrestrained and other protective devices such as airbags are unable to work properly without the controlled, predictable kinematics which a seatbelt can provide.
The seatbelt remains the single-most important item of safety equipment in the carEuro NCAP has, for many years, rewarded seatbelt reminders and such systems remain a central part of occupant status monitoring. In addition to SBR, new technologies exist which can monitor the condition of the driver: whether or not he or she is alert and paying attention to the driving task.
Ok but how SRS knows if passenger is present?? If there is no sensor in the seat. How it can calculate? Moreover I have turned Seat Belt Reminder (or whatever it cals in DAS) in 3 modules: AB (SRS), Seat control module and Instrument cluster but the system never remind when passenger's belt is not plugged in.
my car doesn't have WSS (weight sensor) but it knows when see hasn't bothered to put her belt on (and indeed is the same for me as the driver)
in the cluster hidden menus
Gurtwanung nach NCAP = enstsprechend Konfiguration - Seat Belt function [setting] set to NCAP configuration
Gurtwanung abbrechbar = nicht möglich - Seat Belt warning (Visual) [setting] can't be disabled
Akustische Gurtwarnung = aktiviert = Seat Belt warning (Audible) [setting] on
Beginn Gurtwarnung = ab Motortlauf = Seat belt warning (upon Speed above) [setting] with engine running
Gurtwarnung Fond = deaktiviert = Seat Belt warning (Rear Seats) [setting] off
my car doesn't have WSS (weight sensor) but it knows when see hasn't bothered to put her belt on
You most likely have a mat in the bottom part of the seat. There are two types of them with/without child seat detection.
(and indeed is the same for me as the driver)
Driver side is easier. If you driving it means the driver is inside so when a car reach a particular speed it starts warning - this part is working well on my car.
in the cluster hidden menus
Thank you! I have checked my cluster module. Settings was almost the same. Only one was different (Audible) however for the driver seat belt I had sound warning even with this option switched off.
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May I ask you please check what sensor type you have in AB module settings?
Control units -> Body -> AB -> Control unit adaptations —> Special settings -> Seat mat type ‘Passenger’
Note: Do not click on options where you see word 'reset' in it's name - this will reset the AB module. Nothing dangerous but in this case you will need to do initial startup of the module (I did it dozens of times already).
So during initial startup I cannot pass the test above cause it always says NOT ASSIGNED. When I open the help menu it referring to component B41/1: "Front passenger seat occupied recognition (without code (494) USA version and without code (U18) Automatic child seat recognition (ACSR [AKSE]))". So SRS (AB) block think that I have this sensor... I really need to check it physically if any sensor is installed and there is a chance that an emulator could installed by the previous owner so it always shows NOT ASSIGNED.
PS: I defiantly must learn how to use WIS cause PDF above is from WIS but I wasn't able to find this document when searched WIS yesterday
have you fitted a fat bloke USA seat module (not seat sensor) to a European car and not coded it back to normal
Simple occupancy sensor
B41/1 Front passenger seat occupied recognition (without code (494) USA version and without code (U18) Automatic child seat recognition (ACSR [AKSE]))
Expensive large air bag occupancy sensor (using WSS)
B48 Front passenger seat occupied and child seat recognition sensor (with code (U18) Automatic child seat recognition (ACSR [AKSE])
NOTE: ACSR Automatic Child Seat Recognition is the English and industry std way to write Automatische KinderSitzErkennung
I read WIS more carefully and researched how these sensors work. In EU cars from June 2007 with the B41/1 sensor (without child seat detection) this mat serves only as a reminder of not applied seat belt, the deployment of the airbags and other SRS functions does not depend on it (however it did depend before June 2007). Hence there is the SBR (Seat Belt Reminder) option selected in AB module. So most likely I should have a mat installed, but it seems there is an AliExpress emulator installed or just a resistor. I will check the seat at workshop and let you know.
PS: From June 2007 there is also another type of mats (with child seat detection) - those signals are used for SRS system deployment.
10-13-2024 | 04:14 PM
