08-26-2018, 11:47 AM | #1 |
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Hi guys,
I really need your help here. I just installed a pair of M4 seats but keep getting air bag light. The install is a direct fit and I did use the new plug from the new M4. Other than airbag light, all the functionalities seem to work fine. The installer suggested to add a resistor to clear the code. But I think it can compromise the airbag functionality. Appreciate anyone with useful info! Here is a picture if it means anything. Thanks Sean
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08-27-2018, 09:08 AM | #2 | |
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08-27-2018, 09:12 AM | #3 | |
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08-27-2018, 09:14 AM | #4 | |
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Would using M2 module make the M3 seat a plug and play? Anything else should I do? Thanks for replying! Sean
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08-27-2018, 09:17 AM | #5 | ||
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The plugs are the same. You just need to switch to the original module.
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08-27-2018, 09:39 AM | #6 | |
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What do you suggest as my course of actions? First swap the old module and then go to dealer (only dealer can do it?) to clear the code? Thank you!
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08-27-2018, 10:10 AM | #7 | ||
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I usually wait about thirty minutes to make sure the power is off. Make sure you leave the trunk open!!
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08-27-2018, 10:58 AM | #8 | |||
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https://www.e90post.com/forums/showthread.php?t=552877 https://www.youcanic.com/bmw/airbag-light-on See time mentioned in Step 2. Guessing time is waiting for capacitors to discharge. https://www.youcanic.com/bmw/airbag-...el-replacement Last edited by omasou; 08-27-2018 at 11:09 AM.. |
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08-27-2018, 04:53 PM | #9 |
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Some modules have inertia switches in them. NEVER UNBOLT OR MOVE AN AIR BAG MODULE WITHOUT DISCONNECTING THE BATTERY AND LETTING THE SYSTEM DISCHARGE. You'll have an expensive repair on your hands and could be seriously injured or killed. Do not add any additional resistors to the system either.
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08-28-2018, 06:17 AM | #10 | |
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There could be 2 reasons for the restraint error, one is the airbag in the seat (behind the seat trim, and the other is the seat belt holder itself. If the donor car has had a minor collision, the seat belt holder is probably shot Both of these can be swapped out from the m2 seats, but start with the seatbelt holder since it’s the easier of the two to switch out And yes, the grey box usually also has to be swapped out
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08-29-2018, 02:14 AM | #11 |
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I have a good installer of mine disconnect battery and install the grey module of m2 seat. But problem remains, the error is resistor is greater than should.
Some say some kind of wiring job is required. Can anyone shed some light? Also the m2 stock diagram will be very useful. Thanks! Sean
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08-29-2018, 05:51 AM | #12 | |
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The m4 seats are compatible to the m2 module, so there shouldnt be any splicing or messing around
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08-29-2018, 06:53 AM | #13 | ||
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I'm running out of solution, really...
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08-29-2018, 06:56 AM | #14 | |||
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david51 might be able to help, he has m3 seats on his f22
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08-29-2018, 07:00 AM | #15 | ||||
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08-29-2018, 07:05 AM | #16 | |||||
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Worth a shot since it takes 2 mins to swap out Sorry when i say seat belt holder, i meant buckle [IMG]https://www.autopartsapi.com/eEuropa...ad9ef2ed29.jpg[/IMG]
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08-29-2018, 07:25 AM | #17 | |
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08-29-2018, 02:23 PM | #18 |
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Every component in the supplemental restraint system has a specific resistance. The module looks for the exact resistance in each circuit to determine if everything is functioning properly. If it sees a resistance other than what it is programmed to see it will set the light. The light can not be reset until the module is happy with all it's readings.
EDIT: You could always compare old components to new ones to check for compatibility with an Ohm meter. If both old and new components show the same resistance you should be able to swap them with no light. |
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08-30-2018, 01:01 PM | #19 | |
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BTW, I found my seat adjustment button works in a reverse way (up and down). Press up and it goes down and down it up... Did you experience the same?
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08-30-2018, 01:48 PM | #20 | ||
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08-30-2018, 09:42 PM | #21 | |
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Can confirm it was reversed on mine too before i swapped out the grey box with the one that came on my m2 |
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08-31-2018, 09:53 PM | #22 |
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M3 seats (unlike M4 seats) don't have those buttons and pull flap to slide and fold the seats back for people to get in the back seat though, right? How will you be getting people/bags/etc. in the back seat? Seems like it would be a pain in the ass to use the electric seat controls every time.
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