Howdy all!

Picking up our new to us G01 on Monday and I would love to find a way to disable the auto-synch of the seatbelt. I don't mind it much but it drives my wife insane, and its her car.. so motivated to kill that.

I searched but didnt find anything immediately, and would love to turn this off, code off, unplug the motor or who knows what on day one.

Thanks!

Quite sure the seat belt hug is only initiated if your off axis, meaning the seat belt realizes there is some "play" in the belt, like your reaching for something. It does not happen all the time and seems like an excellent feature letting you know the system is working and your properly buckled up. I believe this is an integral safety feature, or your X3 is looking out for you.

ContactPatch wrote

Quite sure the seat belt hug is only initiated if your off axis, meaning the seat belt realizes there is some "play" in the belt, like your reaching for something. It does not happen all the time and seems like an excellent feature letting you know the system is working and your properly buckled up. I believe this is an integral safety feature, or your X3 is looking out for you.

Yeah I hear you but also have seen the feature across multiple models, that synch no matter what. Seems intiiated at a certain speed.. I was so grateful my M2 doesn't have it.

My wife feels like she is being strangled, so would love to disable it if possible.

I love the hug. Love you too, car.

I’ve searched and searched and come to the conclusion that it cannot be disabled or coded out. I hate it too. Just have to remember to hold the belt after you buckle up. It seems to be somewhat “learning”, in that if you pull against it enough times it eventually gets to be lighter on the pull.

I don’t care what anyone says. It’s not a safety “feature”. The seatbelt retracts by itself without this mechanical pull it does. No other car I’ve ever driven in does it.

jsh139 wrote

I’ve searched and searched and come to conclusion that it cannot be disabled or coded out. I hate it too. Just have to remember to hold the belt after you buckle up. It seems to be somewhat “learning”, in that if you pull against it enough times it eventually gets to be lighter on the pull.

I don’t care what anyone says. It’s not a safely “feature”. The seatbelt retracts by itself without this mechanical pull it does. No other car I’ve ever driven in does it.

The latest 24/25 models are even more aggressive in the synch. I will keep looking.. there has GOT to be a way.

BMW DIY Guy wrote

The latest 24/25 models are even more aggressive in the synch. I will keep looking.. there has GOT to be a way.

If you figure it out please let us know.

jsh139 wrote

I don’t care what anyone says. It’s not a safety “feature”. The seatbelt retracts by itself without this mechanical pull it does. No other car I’ve ever driven in does it.

Your position is clear, but for others reading along...this is definitely a safety feature in BMW and MB. (I have not checked Volvo lately.). The amount of retraction in the base mechanism provides convenience for storage and will lay the belt gently across the torso. It does not take up all the slack which is the direct cause of loss of effectiveness of the restraint. The only "give" in the restraint is the intentional stretch of the webbing during impact, which is why belts must be replaced after one hit. If one wears a puffy coat or has layers of clothing, effectiveness is reduced if the belt is not pulled snugly against the torso. BMW and MB don't do this without reason. It clearly improves impact performance in FMVSS 208 testing versus the casual draping of the belt from the retractor. Defeating it simply adds safety risk back into the system.

Sportstick wrote

Your position is clear, but for others reading along...this is definitely a safety feature in BMW and MB. (I have not checked Volvo lately.). The amount of retraction in the base mechanism provides convenience for storage and will lay the belt gently across the torso. It does not take up all the slack which is the direct cause of loss of effectiveness of the restraint. The only "give" in the restraint is the intentional stretch of the webbing during impact, which is why belts must be replaced after one hit. If one wears a puffy coat or has layers of clothing, effectiveness is reduced if the belt is not pulled snugly against the torso. BMW and MB don't do this without reason. It clearly improves impact performance in FMVSS 208 testing versus the casual draping of the belt from the retractor. Defeating it simply adds safety risk back into the system.

Ironically enough I am not arguing any of that and your points are good. Side note, again interesting my 25 M2 doesn't have this "feature".

The function though startles my wife every time, and is an uncomfortable trigger type feeling. If I can turn it off, I will.

Sportstick wrote

Your position is clear, but for others reading along...this is definitely a safety feature in BMW and MB. (I have not checked Volvo lately.). The amount of retraction in the base mechanism provides convenience for storage and will lay the belt gently across the torso. It does not take up all the slack which is the direct cause of loss of effectiveness of the restraint. The only "give" in the restraint is the intentional stretch of the webbing during impact, which is why belts must be replaced after one hit. If one wears a puffy coat or has layers of clothing, effectiveness is reduced if the belt is not pulled snugly against the torso. BMW and MB don't do this without reason. It clearly improves impact performance in FMVSS 208 testing versus the casual draping of the belt from the retractor. Defeating it simply adds safety risk back into the system.

Sorry. I don’t agree with you. If it’s a safety feature then why do the rear seatbelts not do it as well? Why do other manufacturers not do it? Why is it not NHTSA mandated?

jsh139 wrote

Sorry. I don’t agree with you. If it’s a safety feature then why do the rear seatbelts not do it as well? Why do other manufacturers not do it? Why is it not NHTSA mandated?

FMVSS 208 (and the passive restraint requirement) only applies to front seats. Future regulations may include the rear, but 208 is currently front seat only.

MB does do it. As I said, Volvo might, but I would need to confirm. It's an added cost that helps them achieve the NCAP and EuroNCAP scores they desire for their premium brands, even beyond the 208 requirement. It is also part of their engineering philosophy and brand positions to provide the most superior safety equipment and performance.

NHTSA sets requirements for crash performance in the 200 Series regulations, not the equipment that accomplishes the goal. How an OEM wishes to accomplish that performance is left to the discretion of the OEM using their best engineering judgement. They self-certify to having met the standard's performance requirements.

You may not like the feature, but it's not a matter of agreement. The physics of the fully cinched belt (not synched, as in synchronized) versus one with some slack are simply facts, demonstrable in g-force loads on test dummies. Those without the feature may do well enough to comply anyway, but having the feature improves the outcome further. I've witnessed enough barrier tests and the preparation for them to have learned this from those conducting them. My wife doesn't like it either, but I've explained the benefit and she deals with it.

I understand there are regulations and compliances. What I want to see is documentation from BMW that yanking on the seatbelt when it is already perfectly snug against my chest does anything to improve their scores. And let’s be clear, here. The hug isn’t pretensioning the seatbelt or anything. It’s just making sure it is against a hard surface. Which it already is. I would argue that disabling the seatbelt chime is more of a safety hazard. As at least the seatbelt is fastened if I were to disable the hug.

The more I think about this, the more I am convinced that this is all just a gimmick designed to give people the illusion that the car is somehow safer. Just like ASD gives the illusion of a sportier ride experience. Especially now that I learn that the 2025 M2 does not do it. What possible explanation could they have for that?

jsh139 wrote

I understand there are regulations and compliances. What I want to see is documentation from BMW that yanking on the seatbelt when it is already perfectly snug against my chest does anything to improve their scores. And let’s be clear, here. The hug isn’t pretensioning the seatbelt or anything. It’s just making sure it is against a hard surface. Which it already is. I would argue that disabling the seatbelt chime is more of a safety hazard. As at least the seatbelt is fastened if I were to disable the hug.

The more I think about this, the more I am convinced that this is all just a gimmick designed to give people the illusion that the car is somehow safer. Just like ASD gives the illusion of a sportier ride experience. Especially now that I learn that the 2025 M2 does not do it. What possible explanation could they have for that?

If a document from BMW is your standard of proof, I suspect you will remain unsatisfied. But, try this on a vehicle without the feature. Put the belt on and just let the natural action of the retractor perform. Then, grab the cross-body shoulder part and tug it tighter yourself. Were you able to get it any more snug, particularly across your hips?

One reason there may be variation between platforms at BMWAG could be differential occupant kinematics on the impact barrier which may related to structural management, air bag deployment timing, seat pan anti-submarining design or other factors, but I doubt we will ever know with certainty.

I've shared what I can and it's fine to doubt my input. For those who find someone who worked in the field at another OEM persuasive, they at least know that there is another side to the discussion than doubting.

The drones in NJ will take control over your vehicle and snug them so tight it kills you .... be safe out there. Seriously though, our X3 is the wifes DD, while it catches you buy surprise in the beginning, it's no big deal after a while IMHO.

My wife loves it and calls it her BMW hug

It's the little things in life..

I WFH and my office is my dinner table so I can yell at CNBC all day on TV and see our cul de sac. I see my wife of 34 yrs finally get her dream car (24 X5) after driving literal shit Nissans for 10 yrs. As she backs out and turns the wheel, I see her smile and touch the belt...😁

Seems to me you either view seatbelts as welcomed safety feature or as an annoyance. As an ex racer who pulled his five point harnesses down as hard as he could on the warm up lap, a one second hug from the belts in my X3 could not possibly bother me less.

I'd been pulling the belts on my analog '95 M3 tight as I roll out of the driveway long before my G01 purchase. Now my car does it for me and like I said, does not bother me in any way.

I didn't know the cinching was tied to crash safety performance. Thanks for all the explanations. Maybe jsh39 will listen. Maybe he won't. If he figures out how to disable it and his wife is in a crash and is injured, maybe he will listen then. But if it were me, I'd just show my wife this thread and tell my wife "sorry but it is for your own good and can't be changed."

The G01 has two aftermarket fitment options that relate to the seatbelt tensioner: DBDR_DEACTIVATE_BELTSLACK_DRIVER and DBPS_DEACTIVATE_BELTSLACK_PASSENGER. They change the following parameters from aktiv [01] to nicht_aktiv [00], respectively:

ACSM5 / 3203 PcComfortFct / cpGleTr1LEnb
ACSM5 / 3203 PcComfortFct / cpGleTr1REnb

Try coding cpGleTr1LEnb to nicht_aktiv [00] to see if it does what you are looking for. If it does not disable the automatic tensioner or gives you persistent errors or warnings in iDrive, code it back to aktiv [01]. (Coding anything in the ACSM module will usually give you some kind of a warning that goes away after a few minutes or after shutting the ignition off and turning it back on. But if the warning continues to show up, you should code it back.)

If you do this, can you please report back to this thread about the outcome?

AlteBMW wrote

I didn't know the cinching was tied to crash safety performance. Thanks for all the explanations. Maybe jsh39 will listen. Maybe he won't. If he figures out how to disable it and his wife is in a crash and is injured, mmaybe he will listen then. But if if were me, I'd just show my wife this thread and tell my wife "sorry but it is for your own good and can't be changed."

That’s a bullshit thing to say and you know it. Now you’re pissing me off. Like I would want to intentionally cause harm to someone. I was happy to let this thread sink to the bottom and die like the other ones where people have asked this same question. And the same thing always happens. People like to feel superior by getting on their high horse and put people down for asking a simple question or giving an opinion. It’s not like we’re talking about taking seatbelts out of the car or disabling the pretensioners that automatically pull back the belts in the event of a crash. We’re talking about a tug on the belt that hasn’t been proven to be necessary other than people theorizing that it is. Show me concrete evidence that it does anything and I will concede this point. Literally squirming around in your seat or turning your head to look over your shoulder puts slack into the belt. The car doesn’t automatically pull it back again when you do that. Come on, you’re totally reaching here.

I for one wasn't putting anyone down or suggesting that disabling the hug was unsafe, just saying that of all the things one can be bothered with, this one seems minor.

And FWIW, every single person that can drive a car is capable of reducing the seat belt slack on their own by pulling on it. I don’t need the car to do it for me. This is what we are asking for. Again, not trying to disable safety features and put people in harm’s way here. Why this is any different than disabling the navigation warning screen or disabling ASS or ASD is beyond me.

I don't have any answers. But I'll just say that it was weird for both me and my wife for the first few weeks. And we felt the same way.
But now we don't even notice it, and actually like it.