GM Chevy Truck: Airbag Warning Light B0044 -Part2
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- เผยแพร่เมื่อ 26 มิ.ย. 2015
- We discuss our findings from Part 1 and showing the final fix for the Airbag system DTC B0044 on this '07 Chevy Silverado.
Link to part 1: • GM Chevy Truck: Airbag... - ยานยนต์และพาหนะ
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Very nice video. As an electrician and someone who scans and repairs their own vehicles, it is great to see someone trying to educate others on basics of Ohms law, and circuit testing, especially how it applies to auto repair. I commend you on taking all the time to video your progress as you worked through the problem.
Thanks for sharing. I had B0044 and B0026. B0026 got cleared out when I reconnected the yellow connector (C275) under the steering wheel. B0044 was still there, and I was reading 2.8ohm at C275 white/pink terminal. Now, I measured resistance at SDM white/pink terminal, and sure enough the reading was increased to 6.4ohm causing B0044 error. There was >3ohm resistance between SDM white terminal to C275 white terminal. I googled, youtubed GM/Chevy airbag errors, and none of them mentioned connector behind kick panel, but I finally figured that there is another yellow connector (C221) hidden under kick panel. I removed kick panel, disconnected connector, cleaned with alcohol, applied dielectric terminal grease, reconnected connector, and yay the error was gone. If anyone has airbag error due to connection issue, make sure you have clean connection at three connectors (C221 under steering wheel, C275 behind kick panel, SDM under driver seat)
It’s 2024. I’m just here to see a handsome young man, Ivan.
What a great video series in diagnostics. Thank you for sharing. Keep up the good work. Usually when I get an air bag issue, if is not a sensor or seat belt switch I send the customer to the dealer. Air bags are usually covered under an extended warranty due to it being a safety item. But thanks again, I look forward to seeing more of your diagnostic videos.
George Heri Hey George thanks for the comment! I wonder if a 2007 would still be under warranty? The dealer would probably have thrown a $600 SDM unit at it and possibly "fixed" the problem in the process :)
Ivan, my friend, you are the kind of mechanic that I would like to have working on my vehicle. Very knowledgeable of the equipment, and persistent in finding the root cause of the problem. Very impressive and deserving of big respect from this old veteran from Virginia. Thanks, my friend. Keep up the good work.
Thank you Harold for the kind words! Sometimes that persistence in finding the root cause is time-consuming, but we are all sure to learn from the experience :)
Excellent job of analysis, troubleshooting and explanation. Very informative and helpful. Thank you!
Ivan, anyone ever tell you that you're wise beyond your years? I have a 2004 K1500 and I pray I never have this issue.
This is a hair pulling case study! Great job, as usual!
Nice find on the intermittent pin connector inside the connector. And I was thinking of using a loaded circuit as you did to measure the voltage drop. For cases where there is intermittent contact, I spray the terminals with a generic contact cleaner such as CRC. After it air dries, I follow it up with a squirt on each pin using Dexoit 100 which chemically cleans the terminals. After it dries, I put a dab of dielectric silicone grease into the female side of the connector pins. Good work Ivan!
stuzman52 Thanks for the tips, Terry! Intermittent pin contact issues are the toughest ones to pinpoint for sure...as soon as you touch or backprobe that connector, it may fix itself! And this Airbag circuit in particular was so sensitive to extra resistance, that even one parasitic Ohm would throw a DTC.
You are correct Ivan as intermittent problems are the toughest ones to find. You've covered all the bases very good and you're right with such a very low resistance, that even makes troubleshooting even more challenging.
Great video Ivan, my business is repairing boats and corroded connectors are a constant problem. I have found Deoxit D 100 to be a god send for servicing electrical connections, everything from high voltage shorepower to stereo remote connectors I use it first to help eliminate the connections and better than 50 % of the time that fixes it. I service my own vehicles and between you, Eric, Scanner Danner and Matt you guys give me the confidence to tackle any electrical problem period.... You are truly a professional. Keep up the good and God Bless !!!!
I use Deoxit on audio gear. While watching this I was wondering the same thing
You did great, love the video, very educational.
Nicely done. Very complete. Thanks for taking the time to do it correctly.
good job explaining the parameters of what a controller looks for
Woah...thanks mate, I learnt something, I know nothing about air bag things.
Great videos as usual.
Really good video Ivan 🤩
Seems to me like you could really make a cool video to help people learn how a airbage actually works to help people like me whos so affraid of them deploying! I really dont under stand how they work? I sure dont wanna hit a bump & that happen! Been thinking about away to disarm it & not have a light on! Your very smart! Wish i could remember like you! God bless you!
cool video Ivan.!
Usually what I do is spray with WD40 (or equivalent) and plug and un plug the connector a few times and this cleans the connector of the resistive materal
That is what I do. I'm sure Ivan does too. Years ago, I worked on a lot of swim pool heaters and they use pilot generators that produce 500-750 millivolts of power. In order to energize the gas valve this very low current would have to travel through three switches. Just spraying the switches with WD-40 and turning them on and off would fix the problem
Wow, you have well earned my subscription!
Thanks Donny! Welcome to the channel!
You can do a vibration test on the connector: place a speaker on top and let it sweep some low frequencies. If you see outages with your scope you found the issue.
Could you have done a voltage drop test between the low and high pins to see the resistance?
What if the air bag connector does not have any voltage at all. My 2005 Cadillac Escalade have no voltage at that connector under the the dash? Codes B0026, B0043, B0044 the same that came up on your Snap on scan tool. I Can't pass inspection with the airbag light on. I love your explanation on all the circuits also. Help needed,
I got 2 of those shirts and won a third one but didn’t receive it. That was a bummer because I wear them all the time. One of my favorite shirts.
Great video. Just a thought, sawtooth related to 500ms spec, filtering glitches?
Wow great job. Did you ever do the EVAP video of this truck???
Good job Ivan that was a dilly
Brilliant!
I have 3 air bag codes on my 2003 GMC envoy and I'm hoping it is this easy of a fix
Hey Ivan, I tried finding that link with Mark j hicks and Eric. Could you post a link on the video. thanks
Can this also work on a 2006 Chevy uplander?
Hi Ivan, Thanks for sharing your video. You know that DVOM will send out small voltage when you measure resistance on the circuit. Are you confident that you are measuring air bag inflater's resistance with DVOM? I'm not sure it's proper example but would you go underneath vehicle that is lifted with a floor jack only? I wouldn't. I would use another jack stand. It's safety issue. You knew that this code is due to high resistance on the circuit. Most vehicle air bag inflater have about 2~2.5 Ohm and you can see the vehicle individual air bag circuit resistance on the PID list on most vehicle(I'm not sure you could see the air bag PID list on this 07 chevy silverado) . If you have 2~2.5 Ohm resister, You can narrow down the problems. Just unplug the air bag inflater and connect the resister. If code is still there, you know that the inflater is ok and clock spring and connector c275 and connectoer c221. If the code is still there, you know that the module or module connector is faulty and finally do the pin drag test with special tool and you will know what the problem is or wiggle the harness/connector individually while watching the air bag PID list and you will see the erratic resistance change. How much will you charge to the customer for this poor contact after spending few hours. Please correct me if I am wrong. You were one of my best teacher in this field after watching the Hyundai Tucson twisted cam shaft case study. Thanks again
+FREDDIE HYUNHO LEE Hi Freddie, in this case there was no PID showing actual inflator resistance on the scan tool...that would have been a great time-saver!! Sure, you can use a substituted resistor instead of a DVOM...just takes time to find the right one. Actually I have done this permanently on my own truck to disable the driver's airbag and keep the system happy (don't want an explosion happening in my face :)
But there is no safety concern here; the DVOM will NOT set off your airbag lol! You need a significant CURRENT (not just voltage) to set off the airbag; DVOM cannot provide that current.
i believe i seen a small voltage difference on your first video between the low wire and high wire ... on the MV scale side of things ..... one thing i have found is it best some times to just walk away from the job for a few to let the brain have time to think , then look at it again ... eric o also said be mind full of wire wiggling when testing might just fix it .... good find though you stuck with it to the end with a good result ....
thanks once again on the bbbind.com has save my butt several times all ready
Which online reference for code definition you are following on the laptop? Much appreciated
my dad has a chevy avalanche 2003 and it was problem on the module smd the code that it gives him b0051, he sent to reset two modules and the code keeps coming up , what will you recomened pls we need a responce asap
we wanted to know your answer cause we have seen your videos and you look like a person who knows
There must have been some excess resistance in the connectors and just unplugging them and plugging them all back in was enough to clean them up and reduce the resistance. Every single connector adds resistance to a wiring system. Using three sets of connectors on a single circuit with a computer constantly testing for any extra resistance is just an error code waiting to happen.
+Rod Palm Yeah these circuits that measure low resistance are very touchy to poor connections for sure.
hey Ivan .I had the same problem same truck I unplugged the plugs and replug them in and it fixed it .
Sweet!
Pine Hollow Auto Diagnostics
When you plug/unplug the wires do you have to disconnect the battery?
Thanks
I didn't disconnect the battery...but every service manual will say "disconnect battery". Use your best judgement :)
Nice job
So what was the problem??
What are the conditions that will deploy the air bag? How many ohms or how much volts to the bag?
Thanks for your information maybe you can help me.
My truck GMC. 2500 crew cab code b0103 I changed the sensor but the light still there thanks again
The whole course of the videos for this truck I've been waiting to hear the sound of a small explosion followed by Ivan crying because he just set off the airbags in the truck..,
+AvidAviator Sorry to disappoint you... no explosions lol! In fact I'm kind of paranoid of airbags...on my own vehicle I have permanently disabled the driver's airbag by simulating the igniter with a couple resistors from RadioShack :)
Advice from the Automotive Career Development Center, on Google, by searching for "Stabilant 22". The product is a contact enhancer, originally developed for the Canadian Armed Forces needs in Arctic conditions. It's not cheap, but is the best I've ever found when performance is critical and/or intermittent. We used it when multiplexing 2,700 telephone channels onto a single circuit. Big headache solver.
Thanks 😊
I have a 2007 Chevy Cargo Van. No loos wires or connections. The airbag blinks and then it stays on. The drivers seat recognizes me sitting in it with the seat belt unbuckled . The passengers seat does not recognize me. I can sit in passenger seat and seat belt light will not come on. I pulled the seat out and unplugged it and same problem, airbag light on and no seat belt light. I pulled back the vinyl seat covers and see a module with a ribbon cable going to a pad. Could the seat module/ribbon cable pad be open??
scan for codes.
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hi , thank you for your video You really professor
I need your help I have chavy 2008 trailblazer it have two errors B0026 ,B0065 Can you give me the steps to check the problem؟؟
I don't think I'd have written "Ok" in you white board inequation when talking about resistance because it looks like "zero k-ohms" in context.
have the same problem on my 03 same motor etc. just dont wanna mess with it. saw another video where a wire behind passenger seat was cut, but that wire is fine . i would really want to fix the problem i hate that "service airbag" light
Is it the same trouble code? Might be a simple fix :)
motoYam82 i havent done code search but ill take to a friend that has the comp. reader to see what code it gives. i havent tried disconnecting the yellow one under the driver. i did passenger but still same result
You have to get the code first...there are literally dozens of possible problems so without the initial scan you will be guessing in the dark. Good luck!
Same thing happened on my 2003 Silverado 4.8 liter.
Codes
B0026
B0043
B0044
So did you fix the problem? If so what was the issue? And how did you fix it?
diagnosing airbag dtc's is like walking in a minefield, not because of the airbag itself but the sensitivity of those circuits are really high, you have to thread lightly, the slightest touch as demonstrated in this case, will throw you off to oblivion
To make a long story short, you jiggled a wire to get the airbag light to go off.
Auto electric defective parts....as usual. Tiny minimal crimp joints and very little surface area for contact to the origin to destination terminators. I'd have to have a good paycheck to have spent that much time verifying and finally causing the self repaired connection. Maybe some die electric grease on a very fine dense Q tips applicator to those pin/wire connections. GM needs to make their elect systems less tempermental to very tiny Ohm and Volt changes.