02-16-2023, 06:19 AM | #1 |
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Driver Restraint System Fault
So, after replacing the springs that snapped thanks to potholes I need to fix the driver restraint system fault its started throwing. Scanner says its a short or disconnection to the airbag control module under the driver's seat. Has anyone taken the front seat out of their 6? There's not enough space to get at the module even with the seat raised as far as it can go. Also, if I need to buy a replacement control module, does it need to be coded to the car?
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02-16-2023, 08:04 AM | #2 |
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Hi Billy,
I have the same error in my 2013 640d GC and been told that its likely a wiring issue. I was going to take it my mechanic to get the wire changed but havent had time yet. There is an open recall right now for the driver airbag and I am booked in to have it fixed in May so might get BMW to have a look at this as well. I tried using bimmercode to reset the error but it comes back after a couple miles. |
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02-16-2023, 09:08 AM | #3 | |
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Thanks for the reply, what year is your 640d? As far as I know I have a recall outstanding for the EGR valve but can't find anything about the airbag.
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02-16-2023, 09:17 AM | #4 |
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02-16-2023, 09:29 AM | #5 |
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Yeah its a 63 plate. I had the EGR done last year and got a letter from BMW last week about the airbag. Its booked in for 1st of May at BMW Hillington.
Check this website if yours is also affected: https://www.bmw.co.uk/en/footer/quic...e-recalls.html |
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02-16-2023, 09:34 AM | #6 | |
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Yeah I got the letter about the EGR but can't find anything about the airbag. Not sure if the airbag is recallable, its MOT expired because it took so long for the replacement springs to arrive. Hoping it doesn't take until May for them to sort the airbag if it is covered by the recall.
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02-17-2023, 08:32 AM | #7 |
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hi.
my last 640d leaked water through the yellow grommet and i had to take the passenger front seat out. removing the drivers seat is same as passenger seat. first move seat fully forward,then unclip the covers on the end of the seat runners,these are tricky to remove and if you break a locating tag off they wont stay on.they are approx £5 each too. when you get rear runner covers off make a note they are different and then remove the torx bolts that hold the runners to the floor. then slide the seat fully backwards and remove the runner covers,again they are different,then remove the torx bolts. lift up the seat at the front a bit and remove the wiring harness clips that hold the harness to the bottom of the seat..do not unplug this harness ! there is only one wiring connector.. when you get the harness clips off there will be enough free play to tilt the backrest as if someone was getting in the back,then manually tip the seat backwards..you noe have full access to all the seat modules..this should take 10 minits. if you do unplug the wiring conector you will have air bag fault codes come up. if you are ok with that then you can take the seat out of the car if you wish.be aware the seat is VERY heavy. when re installing the seat be carefull clipping the runner end caps back on. |
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02-19-2023, 08:15 AM | #8 | |
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I've just been out at the car again. I removed the driver's seat disconnected and removed the module, no signs of water or damage to the wires, opened the module, no obvious signs of corrosion/damage. I put it all back together, cleared the codes and took it round the block. The error came back within 2 minutes. I did notice 2 modules under the seat, a larger grey/white module with 6 connections, and a darker grey smaller one with one large connection.
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02-19-2023, 08:25 AM | #9 | |
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Just saw this online. The car has been sitting for about 3 weeks now, its been giving low battery warnings when I've been out working on it. Could a dying battery be causing the problem?
https://www.youcanic.com/bmw-restrai...m-malfunction/ Quote:
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02-20-2023, 03:15 PM | #10 | |
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02-21-2023, 03:57 AM | #11 |
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02-21-2023, 05:23 AM | #12 | |
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Let us know how you get on with the steering wheel. |
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02-21-2023, 06:00 AM | #14 |
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02-21-2023, 01:15 PM | #16 |
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Update: I didn't blow my hands off. Took the airbag out, checked the connectors, everything looked fine. Blew on everything just in case. Put it back together, cleared the codes and ran the scan and now its saying there's a short in the airbag module behind the glovebox. Thats a tomorrow job.
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02-22-2023, 04:39 AM | #17 | |
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02-22-2023, 01:25 PM | #18 |
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Thats the code I'm getting. I've tracked it down to the active head restraint, the ground wire is shorting against something. Problem is I can't figure out how to open the seat up to get at the wiring inside. Any ideas?
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02-22-2023, 01:40 PM | #19 |
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If its any help I found this video of this guy working on his front seats. It kind of shows how the back of the seat comes off and the wiring for the headrest active restraint. Its not great but its the best I've found so far:
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02-23-2023, 08:32 AM | #20 |
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You need to take the seat out to get to it i think. I tried getting to it with the seat still in the car but you cant take off the plastic at the side because of the centre console.
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02-23-2023, 11:12 AM | #21 |
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I figured it out. Gently prise the plastic away from the seat, once the clips are undone, lift the seat back and up (I was sitting in the back seat) and it'll come out. The leather backing is clipped to the seat frame, undo those clips and you can get at the wiring in the back of the seat. I found a short on the plug for the headrest restraint, I'll fix that and that should be it. Might even just put in a bypass like in the video above and that should do it.
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02-23-2023, 01:21 PM | #22 | |
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