HowTo: Build Seat Occupancy Bypass BMW Cheap
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- Опубликовано: 22 авг 2024
- **CLICK HERE: To see how to install the bypass.
• HowTo: Install Airbag ...
If you find are having a problem where your BMW is showing an "airbag" or "restraint System failure" warning light for no apparent reason, it can more often than not be due to a faulty occupancy sensor in the passenger seat.
This sensors job is to tell the car that there is a passenger sitting in the seat so in the event of an accident, the car knows to fire the passenger airbag. The mat sensor is a very common problem in many BMW models and can be damaged from something as simple as kneeling on the passenger seat. You can have the seat sensor replaced entirely by a dealer but this requires the seat to be removed from the car, stripped of its upholstery and can cost as much as €600 as it takes a few hours to complete.
This little mod is a very simple one that mimics the values sent back to the car by the original seat sensor when in good working order, so the car will always assume there is a passenger sitting there and will fire that airbag if the situation arises. If the warning you are having is intermittent then you most likely wont have to visit a dealer to have it reset afterwards. If the airbag warning is always on then you will have to have it reset afterwards. You shouldnt need to spend any more than a couple of euro for the parts to do this mod, My own cost 4-5 quid and i have enough to do about 50 bypass rigs.
Hope you find this useful and feel free to have a look through my channel for more useful/funny/weird video's. :)
I have to answer to myself here :) I did the bypass I connect the cable I start the car and the airbag still was on but I after that I did reset tool and now is over 10 days and the airbag light didnt came back, happy for it, and thanks for this video :)
Works perfectly. Great tutorial. Now my right hand drive interior is in my left hand drive car without an airbag light on.
Glad it worked out for you, pal. Sounds like an interesting project ya have there. 😁
Brilliant! Worked a treat to avoid the MOT failure. Thank you so much!
***** Delighted to help you out, Clive. Don't forget to drop us a Like & Subscribe! It makes all the difference. :)
Worked like a charm, then just needed with diagnostics delete the error and voila heres no more air bag light problem! BMW e46 320i 99yrs
Hi there. I know that you have mentioned to use 2x100 ohms resistors. How many watts should they be? Thanks
Thank you so much, this was a constant pain in the ass.
Hey. Thanks for the comment. Glad you got it sorted. 🙂
great video, thanks for the share, what size diodes and resistors are those?? thanks!
Great job! Just make sure resistors are correctly positioned since they are directional as well. On black side of diode it is brown, black, Brown, gold and on gray side of diode it is gold, brown, black and brown. Always replace the passenger seat mat ASAP to keep safety system working as designed.
Resistors are not directional. Diodes are because they can only conduct power one way.
Resistors.....wrong😮.....no direction.
It Works,--ONLY --- INPA makes clear that the seat is empty. (this means in a accident the airbag will not be fired!)
To make sure the SRS reads the sensor mat right like there is a person in the seat, you have 2 use 1 diode (4001) and a resistor above 300 ohm.
Connect both to the blue and white cable and your good to go!
It can indeed. I'd probably prefer to fit a new pre tensioner though, as it is needed to pull you back into the seat in the event of an accident.
Thanks for the Video!! I had my mat sensor replaced by BMW couple years ago for free luckily because it was a recall here in the U.S. But now it happened again and id like to get rid of it once and for all
Great Job
this guy is a f.. genius!!! thank you!! it worked well
bunny5243 Thanks buddy, glad to help you out. Don't forget to hit the Like & Sub, it helps a lot! :)
im going to give this a try along with the BST cable bypass
Matt McDonough Good luck mate. Let me know if you have any issues or need info. :)
i have a 2000 bmw 582i.
i follow your directions and it works after resetting the codes for the srs.
thank you
yes is a great video...firstly when the bypass is fitted does the OBD2 indicate that the seat is occupied or free...
I have done a ohms check on the seat mat white and blue wires and there is no continuity
is there a check for the censor that the seat mat plugs into ...the BMW manual tell nothing in the wire diagram of resistance...
Have a 318i Touring 1998 E36.Also had a problem with broken seat sensor 2 wires.
Airbag light turns on then off for 1 second and stays back on.
I placed de mod, have to reset de fault and the airbag light turned off.Good Job!
Thanks from the Netherlands.
works like a charm! :) since the mat in the seat was broken anyway,i took about 3-4 cm of wire and the connector from it,and then connected the bypass to it. when that done,connected it to the module. no fear of sparks. :)
@lukewowk That depends on whether the light was on permanently or not. if it was an intermittent fault then no, you dont need the reset tool. If it was on constantly then you will need to reset the light.
Great video parts easily sourced at Maplins for a few pence. Worked first time saved on expensive dealer bills. My light was an intermittent fault so did not require fault reset. Thanks again for your help.
Worked like a charm on my 2000 e46 318i.
Delighted to help!
I'd be very grateful if you would "like" the video if it helped ya. It'll be easier for others to find. :)
Excellent video. Worked a treat, thanks
Glad to help mate, I'd really appreciate a like and share if you found it useful! :)
Excellent video??????......a resistor and a diode with no connection info.....video is useless.
Yes, It can be done on the Elentra too, as it suffers from the same common problem. It may be a little different in how it works though. Google it and see what you can come up with. Its been a while since I worked on one.. :)
Thanks, good video, very clear.
But, can you explain why this works? What is the function of the diode and resistors?
Why can't a wire simply be placed across the plugs omitting the sensor?
I have a similar application of a safety bar in some plant machinery, I'm trying to figure out if the sensor is the issue.
The cars ECU expects a certain resistance value across these two cables when a healthy seat sensor is present. Simply bridging them with wire will not provide any resistance at all and the car will understand this as a fault with the seat sensor. The diodes are kinda like a little one-way valve. They allow electricity to flow in one direction but not in reverse.
Can't really offer much in the way of help with plant machinery, but I hope the explanation above helps you out. :)
It might do, I cant guarantee, but if you do it exactly as in the video then it'll definitely work. :)
I understand the resistor, but why the Diode, pls.
The module doesn't "turn off" the light. It simply simulates a perfectly working seat mat.
You will need to have the light reset with diagnostic equipment and the module prevents the light from coming back on,since the ECU now thinks the seat mat is good.
If you reset the light without the module fitted then the light will just keep coming back, because the ECU is getting a bad signal from the seat mat. Hope that clears that up for you. :)
Thanks mate, works without airbag reset.
Glad to help you get back up and running, mate.
Don't forget to drop us a Like & Subscribe! :D
No probs mate, glad to help you out. If you haven't already, Id really appreciate if you could give it a "thumbs up" as it makes the video easier to find on here. :)
Thank's man ! Tested & Approuved on 316ti e46 (2001) Great !
Hi. Tested & Approuved in a 330d e46 2004!!! Thanks!!!
can you show how to connect to the car? how do you fix the seatbelt chime? Plug in the belt even there isn't any person on the seat?
Hey. There's another video on my channel showing the installation. 👍
I am trying to fix this problem on my Nissan Versa. I learned about this solution, but I still do not know how to implement it. My car is a different make entirely. Some video of plugging it into some holes would be really helpful as I could make some deductions. I am thinking I should make a video doing this myself because the amount of searching I've done is bonkers, and the only answers I've gotten are summarized as: diode and some resistance into blue and white wire. Well, I am pretty sure my blue and white wire is actually supply voltage, sooooooo...
Thank you for your video.
Hi you used 1n4001 diod in this video. I was wondering if i can use 1n4007 diod?
Hey thanks for the video can you please post a video or explanation on how to install the sensor? does it go into the back of the cut sensor plug? or the back of the sensor computer?
thanks great vid
It may work, its entirely dependent on the resistance the car is looking for from the seat mat.
thanks but wish you provided more details how to wire this bypass into the BMW.... and whether it would work for an E90.
Also... the circuit doesn't make sense: In series there is no difference between two 100ohm resistors with a diode in between vs a single 200ohm resistor in series with the diode.
There's another video on my channel showing how it was installed into an E46. It's the same process for all others with the same occupancy system.
You can indeed but the values might be a little different on that car. ideally you would measure the resistance on a perfectly functional seat and make the bypass according to that result. :)
Glad you got sorted mate. :)
@MrAtanasDimitrov Hi, Im not quite understanding what you mean. This device will give the signal that there is a passenger present in the car, if thats what you are asking.:)
I cant say 100%, I'd have a look under the seat and see if the electrical box looks like that on the E46. If it does then there's a good chance it'll work.
Great video, followed and fixed. I now only have passenger seat belt light on, anyway to fix this?
Laddeligist Hey. Glad to help. It might clear after a few starts. If not then you'll need to have it reset and then you'll be good to go. :)
I think either will work, but I can't say with 100% certainty unfortunately.
hi mate, thanks for this video, very useful. just a couple of questions.
1) is it the same ohm resistors and same type of diode for all bmw models? 2) will this apply to my bmw 2006 E90 320d aswell? the airbag and seat belt warning light is on. the check control computer is saying cc id 97. i havent had it diagnosed yet though but stumbled across your video whilst trying to research the problem. thanks
Its hard to say for sure but it sounds like a module that has been retrofitted to the car, maybe to eliminate an SRS light from the seat pre tensioner or something. That's probably the most likely explanation for it. :)
Great tutorial, do you know if this will work for 2009 mkV Jetta. My assumption is that the occupancy sensor is probably common to most vehicles (especially German), VW uses the "Delphi PODS". I have read other VW forums and the problem is ususally solved by experimenting with using a series of resistors to get the right amount of voltage drop to the control module ... yours is the only one that mentions the use of the diode which makes a lot of sense. thanks
hi, i dont have access to it at the moment, look under your passenger seat. theres a plug with 2 wires in it. blue and white.
Unplug that, you wont be plugging it back in. Chop off the plug and replace it with what you made from the video. thats it.
You dont "have to chop off the plug, you can just splice into it behind the actual plug and wire it that way.
I wonder whether it is true, because I did the same model as yours with two resistors and one diode and the light went out on the dashboard without having to remove software. A way that I suggest you should remove the software or it will not extinguish the lamp.
Cpt MishMash VonRandom what should the watts be on the 100ohm resistors? im assuming their 1/4 watt but I really don't want to chance it
work on e46 thanks!
hey, the codes for them are in the "you will need" bit at the start of the video. :)
Hi. Capt.
Thanks alot for the help. apperentley many people are in need of that.
I've tryed it in my Subaru but it didn't help.
or maybe I have other prob. since I tear some Plugs out..
How can I check if my car may work with different electric values?
again
Many thanks
Oz
Hey Hanan, I'm not a Subaru technician but the first thing I would do is get the codes read to find out exactly what your problem is. This is specifically for BMW and your own car might be very different do applying guides like this might even do you damage.
If you do have a seat occupancy issue, you would need to identity the resistance on a healthy seat in order to make a bypass to work correctly. I'm not familiar with the Subaru system, unfortunately. :)
Hello,
Does this works on bmw 118d E87 2007 ?
@Avi4674 Im not quite sure what you mean, Why would you not want to use the old connector? so long as its clean it'll be fine. :)
\Done it to the missus 328i and all Good now thanx no more bleeting onya
Why do you use a diode? Do resistors only work in one direction? I need to create one of these for a 2001 Hyundai Sonata, the tipping point for the system turn on the airbag is 50K Ohms(less than indicates occupant in passenger seat, according to a Hyundai Service Bulletin that I downloaded.
Cool video, i have the SRS light issue on a W203 Mercedes 55 plate C220 CDI, there is a bypass product on ebay for £40 but i would like a cheap quick fix. Will this work? Do you have any advice?
Hi, I recently purchased a 2002 Mini Cooper And the airbag light is now on all the time. I am assuming the previous owner has had some problems also as the mat is now hard wired ie no plugs. I have made an emulator from your tutorial and wish to install it, however on investigation the two wires are RED & YELLOW could someone please tell me which wire to connect to the blue wire on the emulator Thanks Great Tutorial made my unit in about 5 minutes, If I receive info I will post what worksThanks Again
Hi, I have a question. You said this trick makes the system think there is a passenger in the seat and causes it to work without showing a restraint system maulfunction. I have an 07 530i and recently bought a passenger seat emulator module and hooked it up to bypass the malfunction, but it would tell me to buckle the seatbelt even if no one was in the passenger seat. I was wondering if this trick would do the same thing because it's basically telling the system there is someone in the passenger seat which would activate the dinging noise until you buckled the belt, regardless of whether or not anyone in sitting in the seat.
Any help would be appreciated!
Thank you
Hi, if you made the bypass as shown in the video then that isnt going to be the problem. I'd get it scanned with diagnostics and see what that comes back with. It could be another airbag related fault thats showing up this time, like seatbelt tensioners etc. thats also a common problem. :)
What kind of resistor and diode did you used?
Hi. I wanna start off by telling you its a great video! Do you know how to bypass the seatbelt indicator on the passenger seat on a BMW E61?
Hi, Glad you liked it.
I've been out of the loop for a while, but I vaguely remember being able to unplug the seat harness under the seat and that would clear the light. I can't say for certain though, as I've not worked on one for a long time.
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So I should be able to unplug something that is attatched to the "seatbelt holder"? Or what do you mean with "seat harness"?
Yes I think that's right. There's a plug on the under side of the chair. Its been a while since I worked on one so I can't remember exactly.
I love the video, very helpful, worked for another model I was working on, but now I have a three wire one for a 2008 bmw 328i, I figure you may have worked on one by now and might be able to tell me how to use this baby on it? Thanks
Hi, I haven't done it on a 3 wire setup myself, but there was mention here in the comments of someone who had done it successfully. I can't remember their username but take a look through the comments and hopefully you'll find the info you need there. :)
iselili2
hey what's up. I have the same 08 328i e90 . did you figure out what to do please help me out 👍
Nice!!!
But i don't have diode in my country can i use resistor 3.5kohm ? I hope answer me and so thanks
No, it's important that you have the diode. It's easily available online.
do I need the reset tool to turn off the light after installing the bypass? or will installing actually turn off light?
i didn't find anything about the 3 wires plug on your comments . for who ever was able to build a bypass for the E90s
I have 06 KIA OCCUPANCY AIRBAG LIGHT ON what ohm and diode do i need if you know please?
Why not a single 200 ohm resistor instead of 2x 100 ohm, electrically they are in series so it should be no different?
Its hard to say for certain. You should be able to get the proper one in ebay really easily though.
Will the seatbelt light stay on after bypassing the sensor since it tricked the car that there is always a passenger sitting there so it will be required us to put the seatbelt on the passenger seat all the time???
No, you won't have to buckle the seatbelt every time. It doesn't work like that on this model (or at least on the ones here in my region. Yours might be different).
One more question, will this work with the E60??
Right hehe.. I have a Black box/module under my driver seat, BMW E39 and 5 cables should be connected to this box but 2 of them, 1 yellow-red is connected to a white cable, 1 yellow-brown is connected to a white one outside this box. Someone have soldered the 2 wires and i think this has to do with the Airbag light. So i'm wondering if you maybe know what this box/module is for? There is one under the passenger seat as well.
Thanks a lot it works
Glad to help mate, Please like and share if you find it useful! :)
why did you make 2? is this the same as cutting the plug of the mat and wiring it and then plugging it in to the mat module?
also, is it possible that it's not the mat, and the module would have to be replaced?
I was making them for a a couple of people at the same time, you only need one per car. I'm not sure exactly what you mean but it sounds like you're suggesting cutting off the plug and hardwiring it maybe? if so, then no. Thi bypass is connected to the car side of the harness, not the seat. The seat side remains unplugged and the bypass takes the place of it.
Had a diagnostic done it said seat occupancy mat. fitted this had the light knocked out and after 4 day the light is back up?
very thanks tiganhonda :) . i reset and i turn of the lights eith diagnostic compiuter bmw,but lights this turn on again after a week. why? you recomended me another resistance or diode?
@Thenyymi Glad it worked for ya mate. :) No more annoying airbag lights and such a simple mod huh. :D
just need a bit of info
have assembled a unit but could only get 1 resistor of 213 ohms plus diode
together they measures..873 ohms with the white being +plus and the blue being--neg
can you tell me the resistance value of the unit that you made here...
Greetings from South Africa. Firstly i would like to say Thanks a lot Cpt for the two vids. You really were sent from above. I have the same seatbelt & airbag lights on on my 2005 e90 that have been annoying me for a while now. But just to get some clarity.... my apologies if someone has already asked these question in the earlier comments but... and My car is out of warranty so the cost of the seat mat is just too much. But just 2 Questions. 1. will the affected airbags deploy in the event of an accident? 2. What should be the resistance reading be on the Volt Meter when testing the circuit? Thanks again in advance. Will make mine circuit tonight
+Poscent Gonga Hi, as mentioned previously in the comments, The airbags will function normally. The resistance depends on what car and what type of seat mat your car has. I'm assuming yours will be the 3-wire kind, no?
Yes it's the 3-wire one i discovered this last night and it has posed another problem. How do i modify the circuit to accommodate the third wire?
Hey, I haven't performed the mod on a 3 wire myself but someone in the comments here mentioned how it could be done. Have a browse through the comments and see if that's any help. :)
ok thanks a lot
Hi, I used to make them to order but I haven't done that for a while. They are really cheap and simple to make though. If you are not willing to make yourself, you can order similar ones from ebay. :)
@tiganhonda Thank you again :) And yes it's 2 wire regular on mine, since my E60 was imported from Germany 2006 but I can think and be sure that is the same too in Sweden. Cheers
Hi, great little mod. Will this tell the MRS that the seat is occupied? Cheers
Hi
I have a 2003 BMW 745i. I have the Restraint issue and I tried clearing it with INPA but it comes back immediately. Do you have those bypasses ready. If yes, I would like to buy one of you.
No probs mate, glad to help. :)
@congur Glad it was useful to you mate. :) I see you are in Sweden, Does your E60 have a 3 wire occupancy sensor like the UK & Ireland ones? or a 2 wire regular one?
I have a bmw e87 (series 1) in 2010 and has three cables, blue, white, and brown as do the connection for bypas?
Wil this fix work on a 2002 Mini Cooper R50 with a two wire connector? Same value resisitors and diodes?
Thanks!!
Jonathan Selig I would say there's a strong likelihood that it'll work. That Mini shares a lot of stuff with the E46 3 Series. Don't forget to drop us a Like & Subscribe! :)
@ybewiz It will indeed, Ive done it on one myself. :) Just make sure that you are having the occ sensor problem instead of some other restraint system fault before doing it. :)
Hi. I have Audi 80 Cabriolet and cant find out exactly how much resistance the airbag should have and therefore how much resistance should I put....3.2? or maybe 4 ohm?
Its S line Audi a4 steering wheel originally
thanks
Georgi Georgiev Hey buddy. Are you removing an airbag/steering wheel? I'm not entirely sure what you need but I'm guessing you want to bypass an existing airbag in the steering wheel, either to replace the wheel for an aftermarket one or to remove an error from a faulty/blown airbag?
In my experience, most airbags are pretty universal across lots of brands. I can't be certain with your particular car, but check out my other video about seat airbags in a Honda Civic. That info might be relevant to what you need. Don't forget to like and Subscribe! :)
Hi. Could you please tell me what are then names of those diodes and what do I need to ask for in the shop to make on of these. Cheers
Why did you use a diode. What is the total resistance?
I have done your type and my light's gone but today i've done the second one and the light is back on my dashboard, and he told me that i have to remove it with the OBD comp. Sorry for my English......
Great video. Any info on building a w90 3 wire bypass? I looked through all the comments and saw many people ask the question but no answers. Thanks again and I'll keep searching the forums.
Hi, I haven't made a module for the 3 wire setup yet but it's something I may look into, as I often get questions about it. There is of course another option for those with the 3 wire setup. You can have it coded out so that it doesn't require any signals from the seat and will always treat it as if there were a passenger there.
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As far as coding, can be be accomplished with a generic ebay $20 obd2 / usb with a windows laptop or a specific expensive bmw obd connector? Thanks
You can use a cheapo ebay cable indeed. You'll need a laptop running windows and with a serial port, or have a serial port to usb adapter.
When you have those things, you'll just need to get INPA/Ediabas/NCIExpert etc up and running. That's the software that is used to do all the communication with the car. It often comes with the cable or it can be downloaded online. :)
@520BC Your very welcome mate. please leave a thumbs up if you found it useful, if ya dont mind. :)
how many watts capacity did u used for the resistors (100 ohm) ???.. thank you
is this also can solve the seatbelt tensioners warning?
Is this two 100ohm resistors and a 1amp diode?
I have a 2003 Mazda 6 with the same problem do you know if I can do the same.Thanks Rich
@jochylbb you can indeed yup.
So it's one cable per Sensor correct? And its only 2 pins for connector?
There is only one sensor. It's in the lower part of the passenger seat only. That sensor has two cables and the resistance changes depending on whether the seat is empty or if there's a person in it. This bypass replaces the original sensor and feeds the computer the correct resistance to tell the computer that the seat is always occupied. The original sensor in the seat will remain unplugged when the bypass is fitted.