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#1
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Airbag light (93B4 & 93A8) and Clock Spring Replacement
A couple weeks ago I drove over a speed bump while turning and I received the "Pass. Restraint System" fault on the iDrive screen, accompanied by the seat belt and airbag lights on the dash. Scanning with the Carly adapter showed 93B4, or "Driver Side Stage 2 airbag". Uh oh, that sounds serious! After resetting the error, it came on about a mile later when I hit another bump in the road. This time, I received 93A8 fault, which Carly misdiagnosed as "Central control timeout" but google reveals to be "Driver Side Stage 1 airbag." Basically, these errors mean that the airbag ECU is not seeing both of the airbag's 2.2Ohm resistances that it should. The driver's side airbag, located in the steering wheel (the one we all got recall notices about) has two stages, each with its own connector and 2.2Ohm resistor. If the airbag ECU doesn't see the 2.2Ohm resistance, a fault is thrown. To confirm the problem: 1. STORE YOUR PRESETS and disconnect the battery. 2. Remove the driver's side airbag by inserting a screwdriver through the tiny slots in the leather. Check this video for hints: https://www.youtube.com/watch?v=7iZG8Y0Wm6Q 3. Disconnect the two airbag connectors. Again, make sure your battery is disconnected first. To separate the connectors, pry the thin clip away from the airbag with a flat blade screwdriver. 4. Disconnect the left connector leading into the clock spring. These are the airbag wires. 5. Pins are 1-6 from left to right. Check resistance of pins 1&2 and 3&4. Both pairs should be ~7.3kOhms. If they are not, congrats! You have a damaged clock spring or wire harness leading into the airbag ECU. At this point, I wanted to see if I could repair my clock spring rather than buying a replacement. ($50 is a lot!) Following advice on the web, I removed the clock spring by first removing the steering wheel, then the upper and lower cowls around the steering column. More detailed instructions here: My $0.02 Steering Angle Sensor Fix After opening the cover of the clock spring, I discovered the problem: there was a "kink" in the ribbon cable which was causing intermittent contact. I did successfully solder the cable back together, but I have no hope as a long-term repair so I did order a replacement from eBay. When reassembling, make sure you follow BOTH index marks (one on the steering wheel, the other on the steering angle sensor). Failing to misalign the steering angle sensor will cause a 4x4 error light after you reach 20mph. See more details here, pic 7 and 10: My $0.02 Steering Angle Sensor Fix |
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#2
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Im getting the same exact issue right now on my 2010 BMW X5 35d.
I had the dealer do the airbag recall on the passenger side and when its time to pick my X5 up, i got the DSC 4x4 error. Brought it back and then the next day, got the Passenger restraint system error. Now, they want me to pay for the part (labor is free), to replace the SZL, because the service manager said they never have to touch the steering wheel when they replace the passenger airbag so it must have been a coincidence that the SZL went bad on its own while they were working on it. I didnt agree with them.
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"Lapit mga kaibigan at makinig kayo, ako'y may dala-dalang balita galing sa bayan ko Nais kong ipamahagi ang mga kwento at mga pangyayaring nagaganap sa lupang ipinangako..."
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#3
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I am new to the whole BMW world so please bare with me..... I have 2010 X5 35D with the same issue. But here is how it happened. I initially had passenger matt sensor fault. I took it to a guy who said he will disable it via the software and no need for dongles. Then I got a call from him telling me that he was able to disable the Matt sensor but my car has ACSM: Driver's airbag, stage 2. I took the car back and after I have been learning I got ISTA installed and I was able to pull the code he was talking about. However, It turns out the code mileage existent was around the time he had the car. So I am guessing he did something that triggered the computer to trigger this code. I also checked the resistance of the airbag, the clockspring and the wires connect to the airbag and am getting the expecting resistance reading. Any Idea how to go by fixing this or troubleshooting it further? ISTA stated if all checks out check the airbag module next, I have been looking all over the web on the location of the module and nothing. How can I revert what this guy did? what tool to use. Can I use ISA/p for that or NCS? Thanks!!
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#4
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Nice detective work. I would have just cut it at the kink and soldiered the ends directly onto the connector and called it a permanent fix.
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#5
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Thanks for your reply!!! Do you think my issue is the open circuit of the Matt sensor they disconnected after disabling it? How can I revert the changes made to the Matt sensor?
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#6
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Quote:
I am thinking the entire dash comes out and hence they do touch the drivers side airbag and break things along the way. |
#7
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Nice thread.
(Kudos for having the balls to post that solder picture.) Finally, for new folks. OPs prior contributions are notable: https://xoutpost.com/bmw-sav-forums/...e-e70-n55.html |
#8
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I just cleared an error for "Airbag Fahrer Stg 1" which is actually the passenger side from what I can gather. Its coded as 93A8A0 in INPA.
I cleared the error and sat and idled in the drive for 15 minutes and it didn't come back. But I'm glad I found this thread because my heated steering wheel recently stopped working and I can only assume the issue is in the clock spring.
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2009 xDrive35D Comfort seats, Tech, Premium, Cold Weather, Sport w/ Adaptive Drive, Extended Nappa Leather Deleted & Stg 2+ Tune for over 115k miles 227k on the clock Being replaced by a 2016 X5d |
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