Well done, Will. There was so much useful info in that video and you made it look simple to diagnose even though i know it wasn't. Keith is a great guy and is always willing to help.
wysetech2000 thank you:) you are right!! Took me way longer than this 30min video and this made jaws drop in that shop:)) was a good moment felt good.. not sure if they ever seen anything like this to be honest.. I just happened to be there. I wish I could have did this live it’s a moment I’ll remember forever along with everyone in the shop that night
Just encountered this issue on my wife’s 06 trailblazer with the codes U1064 and U1016 along with B codes and and C codes. I’m hoping the computer isn’t taking a crap but watching this video gave me hope that it’s having communication issues. This video is pure gold! You explained everything clearly and with no confusion! You are an amazing tech! I am a mechanic but not on the scale you are! I’m just amazed at the skills you have! Thank you so much for giving back to everyone who may need guidance on these issues! Definitely earned a subscriber in me! Keep up the amazing content man! 🤙🏽
This is the best description and walk through on trouble shoot the network I've ever seen hands down. I've been to many classes that cover the network systems but never really understood it till this video!! Well done!!!!
I subscribed just to comment. I’m having issues with communicatons on my 2006 Equinox. ABS/TSC lights. Also lose Electric Power Steering sometimes. I have a tool, like your Tech 2 tool, that reads like your video. Have similar error codes like this video. Watching you go through your video, and going step by step, makes an old car guy like me happy. Been working on cars all my life, and yours made looking for this issue… fun and endearing. Now I just need diagrams and pin outs like yours. Thanks for making this video!
I subscribed to your channel a bit late in life. I just want to say your videos, including this one, shows Excellent troubleshooting tutorial/ diagnosis and repairs. You did this demo Without a breakout box ect.. shows how important having the proper wiring schematics and knowledge of how these systems interact. Keep up the good work! Side note * this is an example of how important it is for semi introverted people to become instructors. No nonsense straight and to the task at hand. (Slow clap to standing ovation)
Mike Decarlo thank you so much for all the kind words and feedback!!!! Glad you found us~ means a lot reading feedback like this. It’s very motivating to me to say the least... thanks again
Thank you for this video, I have a 2006 trailblazer same motor and I’m getting a U1301 and now I know how to test everything thank you again, I work at a Buick gmc dealership working my way up from the bottom I’ve been in the automotive industry since I was 15 because my dad had his own shop so I am familiar with majority of issues but still need to learn how to diagnose properly and you just helped me get 1 step further, thank you so much
Your welcome! I hope this video helps guide you. I can relate to your story. Been chasing the same dreams from a child raised in my dads. Repair shop. Please share your progress I’d love to hear how you make out with this
Will, it has been a pleasure to watch you grow and evolve over the past few years. The changes from where you began to where you are now are truly remarkable.
Thanks for sharing! So much work involved tracking down these kinds of failures, and fun all at the same time! Tammy is a big help with filming/editing.
Great Video Will, enjoyed it. That combs make diagnosing the network alot easier, that's better than disconnecting every module one by one. Great design.
I would have used a jump wire from module to class 2 connector while connector was disconnected to see if module problem, or other I\O , with other power connector connected. Powered. If power and I\O are on one connector , then i use jumpers. Bad-shorted I\O can pull a module down.
This is an awesome example of troubleshooting!! Logical progression by process of elimination. I have the exact same issue right now with an '05 Suburban LT. I've not started the troubleshooting process, but this video gives me a huge head start. I don't have a scan tool or an oscilloscope but I have everything else. Hurricane Helene has dumped a ton of water on this car and it leaked. I suspect I have a short someone in the floor board or dash related to water. Leading up to this exact same failure I was getting some random OnStar messages with no input from me. So I will start at the VCIM. Thanks to UA-cam for the platform and for guys like you who would take the time to recreate a scenario for the benefit of others faced with the same problem. For a 20 year old truck and 200K there is hope to keep it on the road and hopefully an inexpensive solution. I can say this for sure, in 20 more years the cars that have been produced with dependencies on networks and solid state circuitry will never being showing up at Classic Car shows. They will all eventually be unrepairable do to obsolete and unavailable parts.
I just subbed. That was an excellent explanation of the bus and how to isolate a bad module that was taking out all the others. Thank you!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Fantastic. I am highly trained on modern high and low CAN diagnosis and this still helped me understand single line communication diagnosis. Also it sounds like you are training Michael Shannon
Immensely helpful.... I was working on a 2003 Silverado today with exactly the same problem.... the Alternator, ABS, and Airbag light were on and none of the gauges were reading.... the ALDL was giving no communication tho my scanners were coming on. Now tomorrow I will look into what the video has.....
Nice job. I spent 20 years in the GM/Delphi/Mahle Advanced Systems R&D Group and I run into dozens of guys that simply won't take the time to learn just a bit of electronics and LAN communications to help them figure this out. They show up in my driveway all the time because they won't buy a cheap scope and soldering iron. 99% of the time, as long as the Micro-Controller didn't get damaged, All of these modules can be fixed for a couple dollars and an hour of time. Best Wishes.
Dude a million times thank you I have a duramax that I lost comm with the pcm, tcm ,gpcm and I was struggling checking all kinds of wires you just made this ten times easier for me to diagnose can buss issues.
This was a great video for me Will. I'm researching a intermittent crank/no start on a 2006 Dodge Ram truck. One of the many codes say it has a "no comm" but this truck doesn't have a CAN Bus system (pins 6 and 14) that my Hantek scope can read so I have to find a new approach. This helps. I'm hoping to get up there and hang out with Keith for a few days hoping some of his brain cells will rub off on me. Nice job on the video too. It was easy to follow along.
one of the best video i have seen great job i only wish that you would do more of these videos i was able to clearly understand everything you were saying except following the next splice connector
Just went through this last week with a 98 Seville SLS. I just went through unplugging every module on the Class network until communication was restored. Found the VCIM as the culprit on that one as well. All modules aren't easy to get to so if it was a module that was in a difficult spot, this method would work best but I just got lucky I didn't have to go that far.
Levon Collins that works as well 👍💪 like you mentioned some are hard to get at. that splice pack takes a minute. Getting to the fault is the end goal~with many ways to get there:) great job!!! Thanks for sharing
Best troubleshooting video I've seen. Thank You Sir. Outstanding explanation and walkthrough. I could pull a 1st year student out and give him this video and they will lean more in the time of this video then a week in class. I'm subbed and sending everyone here to sub. Thank you once again.
good work will....I was at chevy back then and never came across that one but as they get older a new set of problems start what brings you to ny im here on long island
thank you very much mr. to refresh my memory It is precisely what I was thinking of doing with the problem that I have in the car. Master, thanks for your help.
Love the video have an 05 Tahoe first started out with the seat driver seat not working.but I noticed if I use the memory seat buttons on the door panel the seat moves now says airbags not working
Nice find! Can I make a few suggestions? I use a DMM to pin 2 at the DLC. I use a BOB, but you said you didn't have that. What is that reading? Remove the splice pack and check the individual circuits. That would have taken you to JX306 and do the same. I'm not looking for any specific voltage, but I want to see activity. When you got to CK 1098 you would have seen the VCIM pulling Class 2 to ground. Make sense? Another tip you may, or may not find useful - on the Tech 2 the "left & right" arrow buttons take you up or down a full 'page'. It saves a little time instead of using the up & down buttons. Nicely done video!
Great training! I, in no way am a mechanic and you made this extremely easy to a layman to understand with logical processes of elimination and even discovered a couple shortcuts doing so. My 2000 deville spitting out similar trouble codes brought me here after battery change. Great video and these scan tools I'm sure are leagues above my analog Klein multi meter. Good stuff
Absolutely great video! I'm an industrial machine electrician which is usually working with AC and much higher voltages but I can really appreciate vehicle wiring and it's different complexities. However videos like yours makes it become just another way of looking at electrical circuits and standard troubleshooting. I do not have a oscilloscope but think it would be invaluable with comms issues like this. What are your thoughts having a cheap picoscope to a pc. I ended up using my multimeter instead, to diagnose a similar issue in my tahoe. As soon as I unplugged a suspect ABS module my network came back to life, but it ended up being downstream at the ESCM and the vehicle ran fine when unplugged. It was a great feeling. But when I changed the module, the issue returned a week later, which now points to the old shock connectors and or the air ride pump system this module feeds. Going to disconnect the fuse power to the pump as it is not in use anyway. I was getting above 8v on can hi and lo on the module, then it went to 2.5v on both when i unplugged it. Thanks again for a great video, you should teach as much as possible, it's a gift when you can explain things well to the average Joe, your very good at what you are doing. 👍
Hi Will. Thanks for sharing this epic info with us. May I ask a stupid question please? Does the vehicle not need the vcim plugged in/online for the rest of the modules to communicate? Apologies if that's a stupid question.Thx and happy new year :-)
JustAnother IrishMan your welcome!!! That’s a good question!! The only stupid question is the question never asked👍 The VCIM dose not need to be plugged in for the other modules to communicate. As you can see the network became active once we unplugged it. Hope this makes sense
That was a very helpful video! I am having com troubles in my Tahoe. I don't have a complete signal loss on my class 2 its just shitty looking and I randomly have problems communicating with various modules. I should be able to follow the same steps watching my scope until the signal clears up, correct?
Great video. Learned a lot. Have you ever had a problem when controlling the driver windows, that the heater fan changes speed? I am looking for a DYI way to read the data seeing that I do not have intelligent scanners. 2008 siverrado.
Awesome video and very informative. It's nice to see a step by step approach that takes novices like me through the process of elimination without just throwing parts at the problem.
Hi. What a great video, you definitely did work on the car like a true detective. Impressive. Maybe you have the knowledge sort my question out below. :) Have a 2002 Tahoe sold new in Europe, do you know what pin 14 are used for in my OBDII port? Do I have GM-LAN in my truck and what protocol does it go under?
I Will great video and happy new year! So if I didn’t have the Tech2 doing this test And the ability to print each one separately, I only have the ALLTEL, besides going through and Unplugging each module separately, while I have my scope hooked up, the easiest way to check to see which module is bringing it down would be to jumper each one and watching the network how it reacts correct? Thanks and keep up the good work, Doug
BigFoote Mobile Auto yup absolutely 👍 and the Alltel would have worked just fine for this entire job. Keep it plugged in the DLC just like I did with the tech2 and you will see the modules come on. May need to keep doing a system scan🤔 good question. Should work... We went for the tech2 just in case the ALLTEL was being goofy lol Plus being a OEM tool it’s much faster and easier..
Michael Herbert thank you! Yes I do believe we could have used the autel throughout the entire job... we went for the tech2 because we had it and wanted to verify a second scan tool had no com. The tech2 will be much easier since it’s made for the job of course However I’m thinking with the autel you might need to keep repeating system scan and see what becomes active.. I’m not 100% but sure there is a way
I know this is an old video, and I'm not even sure if the information I have is correct, but isn't the datalink supposed to have pin 6 populated? The service manual at Operation CHARM states that the rendezvous communicates via high speed GMLAN and the class 2 network, and it mentions: Home >> Buick Truck >> 2005 >> Rendezvous FWD V6-3.4L VIN E >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Relays and Modules - Computers and Control Systems >> Body Control Module >> Description and Operation >> Data Link Communications The data link connector (DLC) is a standardized 16 cavity connector. Connector design and location is dictated by an industry wide standard, and is required to provide the following: - Scan tool power battery positive voltage at terminal 16 - Scan tool power ground at terminal 4 - Common signal ground at terminal 5 - Class 2 signal at terminal 2 - GMLAN High Speed + circuit at terminal 6 - GMLAN High Speed - circuit at terminal 14 I got excited for a moment and double checked, and unfortunately female pin 6 was not populated, and there were only 4 female pins and 4 wires (battery, ground, ground, and class 2 signal)
My favorite is when I get called to a shop to help them diagnose a problem and I don't even use my own diagnostic equipment. I use their equipment to help fix the problem.
Silly question, what do you use to "jump", looks like a piece of coat hanger. Is there any concern of material type, solid copper wire, aluminum something or other... diaper pin?????
Hi. Great explanation, thanks! I have slightly different problem. 2007 Chevy TrailBlazer Without any DTCs message "Stabilitrak not ready" and then "Stabilitrak OFF" appears on IPC display. I understand, it means, that EBCM can't initialize all sensors and other, to make sure, that ESP don't kill you🙃. But main problem is, that there no any DTCs in EBCM, at all. But there is U1166 (both driver and passenger doors) and U1019 on SRS. All succesfully cleared, but Stablilitrak issue don't go away. Maybe you seen that before, or can tell me, which way to go with diag. Thanks!
WOW! Very informative video! I sure learned a lot! I have 2011 Colorado throwing intermittent module error codes like this. Wished I had access to the data and schematics to run it down to which module is dragging down the others? Body panel module and fuel pump modules keep throwing codes on warm days only. I've replaced the fuel pump module but it did not help. Maybe my rear door wiring harness has pinched the wires off again or shorted them together making the body module drag down the network? Thanks for the video! I wished that you were near me? I'd gladly pay you to run down my problem and even pay a bit extra to watch you do it and learn!
Hello, very useful information I'm working on 06 hummer H3 got this code U1041 no communication with ABS module and brakes won't work at all. I don't see a splice connector can you tell me if this car has one thank you very much.
Great video. I know this is an old video. I hope you see my comments and respond. What is the program or source of the technical documentation? What is the best all around scanner? If Tech2, how do you make sure you can diagnose and/or program modules or features? What is the language standard for 2000 - 2006 GMC Yukon and Sierra? Thanks in advance!
Well done, Will. There was so much useful info in that video and you made it look simple to diagnose even though i know it wasn't. Keith is a great guy and is always willing to help.
wysetech2000 thank you:) you are right!! Took me way longer than this 30min video and this made jaws drop in that shop:)) was a good moment felt good.. not sure if they ever seen anything like this to be honest.. I just happened to be there.
I wish I could have did this live it’s a moment I’ll remember forever along with everyone in the shop that night
@@robinsonsauto I've to get the same thing done to my trailblazer soon but I live in kansas city mo who can fix it besides a dealer
instablaster...
Just encountered this issue on my wife’s 06 trailblazer with the codes U1064 and U1016 along with B codes and and C codes. I’m hoping the computer isn’t taking a crap but watching this video gave me hope that it’s having communication issues. This video is pure gold! You explained everything clearly and with no confusion! You are an amazing tech! I am a mechanic but not on the scale you are! I’m just amazed at the skills you have! Thank you so much for giving back to everyone who may need guidance on these issues! Definitely earned a subscriber in me! Keep up the amazing content man! 🤙🏽
Hope you were able to resolve your problem. thank you for the kind words and sub
Hey man you just made me understand THE SYSTEM.I’ve been looking for this explanation for a while.now I’ve got to go fix a truck.thankyou so much.
This is the best description and walk through on trouble shoot the network I've ever seen hands down. I've been to many classes that cover the network systems but never really understood it till this video!! Well done!!!!
I subscribed just to comment.
I’m having issues with communicatons on my 2006 Equinox. ABS/TSC lights. Also lose Electric Power Steering sometimes.
I have a tool, like your Tech 2 tool, that reads like your video.
Have similar error codes like this video.
Watching you go through your video, and going step by step, makes an old car guy like me happy. Been working on cars all my life, and yours made looking for this issue… fun and endearing.
Now I just need diagrams and pin outs like yours. Thanks for making this video!
Your welcome. Hope you get the issue resolved stay on touch
Great diagnosis... Very informative.. The knowledge you gave us is invaluable.. Thanks for taking us along...
MIKE CONT thank you for the positive feedback!!!! Means a lot. Your welcome anytime!!
I subscribed to your channel a bit late in life. I just want to say your videos, including this one, shows Excellent troubleshooting tutorial/ diagnosis and repairs. You did this demo Without a breakout box ect.. shows how important having the proper wiring schematics and knowledge of how these systems interact. Keep up the good work!
Side note * this is an example of how important it is for semi introverted people to become instructors. No nonsense straight and to the task at hand. (Slow clap to standing ovation)
Mike Decarlo thank you so much for all the kind words and feedback!!!! Glad you found us~ means a lot reading feedback like this. It’s very motivating to me to say the least...
thanks again
Thank you for this video, I have a 2006 trailblazer same motor and I’m getting a U1301 and now I know how to test everything thank you again, I work at a Buick gmc dealership working my way up from the bottom I’ve been in the automotive industry since I was 15 because my dad had his own shop so I am familiar with majority of issues but still need to learn how to diagnose properly and you just helped me get 1 step further, thank you so much
Your welcome! I hope this video helps guide you. I can relate to your story. Been chasing the same dreams from a child raised in my dads. Repair shop. Please share your progress I’d love to hear how you make out with this
By far the best breakdown explanation with no filler and fluff. 🙏🙏
Please come diagnose my 2016 Jeep GC 75th Anniv, NO Crank NO Start 🙏
Will, it has been a pleasure to watch you grow and evolve over the past few years. The changes from where you began to where you are now are truly remarkable.
Paul E thank you for sticking around it means a lot~ I appreciate the feedback thank you :)
Thanks for sharing! So much work involved tracking down these kinds of failures, and fun all at the same time! Tammy is a big help with filming/editing.
Bill K you’re welcome anytime!! Wish it was as easy as it appears sometimes lol took way longer as you know:) but yes worth every minute
Great Video Will, enjoyed it. That combs make diagnosing the network alot easier, that's better than disconnecting every module one by one. Great design.
DiagnoseDan Thanks Dan I appreciate your feedback👍 thanks got taken the time
I would have used a jump wire from module to class 2 connector while connector was disconnected to see if module problem, or other I\O , with other power connector connected. Powered.
If power and I\O are on one connector , then i use jumpers.
Bad-shorted I\O can pull a module down.
Well done Will and thanks for sharing. It always pays to know a guy.
Thank you!!! lol absolutely
This is an awesome example of troubleshooting!! Logical progression by process of elimination. I have the exact same issue right now with an '05 Suburban LT. I've not started the troubleshooting process, but this video gives me a huge head start. I don't have a scan tool or an oscilloscope but I have everything else. Hurricane Helene has dumped a ton of water on this car and it leaked. I suspect I have a short someone in the floor board or dash related to water.
Leading up to this exact same failure I was getting some random OnStar messages with no input from me. So I will start at the VCIM. Thanks to UA-cam for the platform and for guys like you who would take the time to recreate a scenario for the benefit of others faced with the same problem.
For a 20 year old truck and 200K there is hope to keep it on the road and hopefully an inexpensive solution. I can say this for sure, in 20 more years the cars that have been produced with dependencies on networks and solid state circuitry will never being showing up at Classic Car shows. They will all eventually be unrepairable do to obsolete and unavailable parts.
u r a great teacher much respect for your expertise
Jo O'Daye Thank you for the kind words!!! Means a lot
This video is gold, thank you for putting this together and making it available for us! I found this video EXTREMELY HELPFUL & VALUABLE!
You handled the situation very patient and clear very professional
I just subbed. That was an excellent explanation of the bus and how to isolate a bad module that was taking out all the others. Thank you!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
ROBERT FERRARA thank you 👍 I appreciate the sub and the positive feedback!!! Welcome:)
Will, you went all Keith on us! :D That was a fantastic, easy to follow explanation. One of my favorites. Thank you for posting this.
lol this was a great time to say the least... Keith is one hell of a guy, I’m not sure how he dose this every day 💪
Thank you for the compliment!!!
Fantastic. I am highly trained on modern high and low CAN diagnosis and this still helped me understand single line communication diagnosis. Also it sounds like you are training Michael Shannon
Immensely helpful.... I was working on a 2003 Silverado today with exactly the same problem.... the Alternator, ABS, and Airbag light were on and none of the gauges were reading.... the ALDL was giving no communication tho my scanners were coming on. Now tomorrow I will look into what the video has.....
Hope this helped out your situation? Thanks for sharing
Nice job. I spent 20 years in the GM/Delphi/Mahle Advanced Systems R&D Group and I run into dozens of guys that simply won't take the time to learn just a bit of electronics and LAN communications to help them figure this out. They show up in my driveway all the time because they won't buy a cheap scope and soldering iron. 99% of the time, as long as the Micro-Controller didn't get damaged, All of these modules can be fixed for a couple dollars and an hour of time. Best Wishes.
Great logical diagnostic routine. Keith is the man for helping you out.
Dude a million times thank you I have a duramax that I lost comm with the pcm, tcm ,gpcm and I was struggling checking all kinds of wires you just made this ten times easier for me to diagnose can buss issues.
Nice job, Will! You got thrown in the deep end, all at once! Way to handle it!
roadkill5333 thank you:) so glad I brought my swimming gear along 😁
I like this video. Thank you for explaining IN DETAIL.
This was a great video for me Will. I'm researching a intermittent crank/no start on a 2006 Dodge Ram truck. One of the many codes say it has a "no comm" but this truck doesn't have a CAN Bus system (pins 6 and 14) that my Hantek scope can read so I have to find a new approach. This helps. I'm hoping to get up there and hang out with Keith for a few days hoping some of his brain cells will rub off on me. Nice job on the video too. It was easy to follow along.
Wow I've been chasing wires and grounds for 3 days. This is will make it so much easier to find the problem! excellent video.
Now you’re taking thing ls to a New Level, Good one 🤙🏼
The Homie Hektor 💪👍 thank you!!!
Great work Will always enjoy watching you work through the issues.
Thank you Mike!!! Your support means a lot
one of the best video i have seen great job i only wish that you would do more of these videos i was able to clearly understand everything you were saying except following the next splice connector
just so you know people are still learning from this well made video
Thank you for this demonstration Boss.
Any time
Meticulous and thorough. Excellent job.
scotsiain1970 thank you for the compliment :)
Nicely done those splice points really help...good wiring diagrams are essential keep them coming
jeffrey herbert thank you for the compliments and feedback!! Will do
Just went through this last week with a 98 Seville SLS. I just went through unplugging every module on the Class network until communication was restored. Found the VCIM as the culprit on that one as well. All modules aren't easy to get to so if it was a module that was in a difficult spot, this method would work best but I just got lucky I didn't have to go that far.
Levon Collins that works as well 👍💪 like you mentioned some are hard to get at. that splice pack takes a minute. Getting to the fault is the end goal~with many ways to get there:) great job!!! Thanks for sharing
This is a great video. Thanks so much for making it. Really helps to mentor us that are trying to learn electrical systems in cars. Awesome job!
Best troubleshooting video I've seen. Thank You Sir. Outstanding explanation and walkthrough. I could pull a 1st year student out and give him this video and they will lean more in the time of this video then a week in class. I'm subbed and sending everyone here to sub. Thank you once again.
Great video and explanation of Gm class 2 operation in real time!
The power of knowledge. Thanks for sharing. Great info.
learningfromthebest now it’s a wonderful thing :) you’re welcome anytime!!! Thanks
Very nice and informative video - especially since I have a no com no start to fix tomorrow...
good work will....I was at chevy back then and never came across that one but as they get older a new set of problems start what brings you to ny im here on long island
scuba422123 your exactly right.. I’m from Ny my Dad is a mechanic as well.. went out to spend a few days
Thanks for another great diagnosis.
RareDiamond Ching you’re welcome anytime!!!
Awesome, I have ground on class 2 date line I think I can find the culprit with this tremendously helpful video wish I had those tools!! Thanks!!
thank you very much mr. to refresh my memory It is precisely what I was thinking of doing with the problem that I have in the car. Master, thanks for your help.
hi, what software from did u get the info for can bus splice location?
A true professional, such dedication to the trade great watch
Great case study Will! Thanks for sharing! 👍
Nick Nicu thank you :)
I bet the customer was happy not to get a new alternator 😉... great diagnoses, very helpful those module ports cheers 👍
Cars Exposed 😆 the best part was she was really understanding. She Watched everything real time!! I had a audience that night to say the least lol
Love the video have an 05 Tahoe first started out with the seat driver seat not working.but I noticed if I use the memory seat buttons on the door panel the seat moves now says airbags not working
Really enjoyed that, you are a good teacher 👌
nobb1euk1 thank you for the positive feedback:)
Good Job Will.
Thank you
Nice find! Can I make a few suggestions? I use a DMM to pin 2 at the DLC. I use a BOB, but you said you didn't have that. What is that reading? Remove the splice pack and check the individual circuits. That would have taken you to JX306 and do the same. I'm not looking for any specific voltage, but I want to see activity. When you got to CK 1098 you would have seen the VCIM pulling Class 2 to ground. Make sense?
Another tip you may, or may not find useful - on the Tech 2 the "left & right" arrow buttons take you up or down a full 'page'. It saves a little time instead of using the up & down buttons.
Nicely done video!
GM's ONLY thank you for your feedback and advice!! Yes makes perfect sense 👍💪 great approach that will save time for sure!
Great training! I, in no way am a mechanic and you made this extremely easy to a layman to understand with logical processes of elimination and even discovered a couple shortcuts doing so. My 2000 deville spitting out similar trouble codes brought me here after battery change. Great video and these scan tools I'm sure are leagues above my analog Klein multi meter. Good stuff
Very well explained. Thank you.
Kirk Abrahamson thank you for the compliment and feedback!!! It’s appreciated
12 minutes in, awesome video so far. What a way to start the year lol! Thanks for sharing!
Angel Garcia I’m glad you’re enjoying it so far 👍
Thanks for sharing. Awesome video! Thorough diagnostics, wish more vehicles had splice packs. & btw great diagnostic setup
Excellent step by step video!!!!
Nicely done Will!
Flat Rate Master thank you Mike
Great job with explaining everything. 👍🏻
Fantastic job! great to see you making videos!
eric smith thank you I will keep them coming:)
good job. I'm saving this in case my Trailblazer acts up.
Absolutely great video!
I'm an industrial machine electrician which is usually working with AC and much higher voltages but I can really appreciate vehicle wiring and it's different complexities. However videos like yours makes it become just another way of looking at electrical circuits and standard troubleshooting. I do not have a oscilloscope but think it would be invaluable with comms issues like this. What are your thoughts having a cheap picoscope to a pc. I ended up using my multimeter instead, to diagnose a similar issue in my tahoe. As soon as I unplugged a suspect ABS module my network came back to life, but it ended up being downstream at the ESCM and the vehicle ran fine when unplugged. It was a great feeling. But when I changed the module, the issue returned a week later, which now points to the old shock connectors and or the air ride pump system this module feeds. Going to disconnect the fuse power to the pump as it is not in use anyway. I was getting above 8v on can hi and lo on the module, then it went to 2.5v on both when i unplugged it. Thanks again for a great video, you should teach as much as possible, it's a gift when you can explain things well to the average Joe, your very good at what you are doing. 👍
Golden video! Thank you for posting / sharing the info!
Happy New Year to you & yours!
Thomas EXOVCDS Thank you Thomas 👍 your welcome anytime!!
Wishing the same for you
Excellent.your the master tech.thanks again for the insight
I appreciate that! Thank you
found a shorted power window module! great info! thanks!
thank you so much for making and sharing this video
Hi Will. Thanks for sharing this epic info with us. May I ask a stupid question please? Does the vehicle not need the vcim plugged in/online for the rest of the modules to communicate? Apologies if that's a stupid question.Thx and happy new year :-)
JustAnother IrishMan your welcome!!! That’s a good question!! The only stupid question is the question never asked👍
The VCIM dose not need to be plugged in for the other modules to communicate.
As you can see the network became active once we unplugged it. Hope this makes sense
A moments embarrassment is better than a life time of ignorance.Thanks for the info. Can't wait for the next video .
Well, explained.. well done!!
Thanks!
That was a very helpful video! I am having com troubles in my Tahoe. I don't have a complete signal loss on my class 2 its just shitty looking and I randomly have problems communicating with various modules. I should be able to follow the same steps watching my scope until the signal clears up, correct?
JOHN HUFNAGEL thank you... you can bring one Circuit up at a time while looking analyzing the wave form absolutely
very interesting thankyou
Great video. Learned a lot. Have you ever had a problem when controlling the driver windows, that the heater fan changes speed? I am looking for a DYI way to read the data seeing that I do not have intelligent scanners. 2008 siverrado.
Bless What an AWESOME 👏 video. Thanks 😊
thanks for this awesome video . Do you think all the cars have splice like GM's has for the network ????
Nice video,
What should the voltage be on that single wire bus?
Awesome video and very informative. It's nice to see a step by step approach that takes novices like me through the process of elimination without just throwing parts at the problem.
Nicely done, Will.
This is so valuable
Thank you
Great work diagnosing that tricky problem. Do most modern cars have that COMB connector and is there a fancy term for it??
Hi. What a great video, you definitely did work on the car like a true detective. Impressive. Maybe you have the knowledge sort my question out below. :)
Have a 2002 Tahoe sold new in Europe, do you know what pin 14 are used for in my OBDII port? Do I have GM-LAN in my truck and what protocol does it go under?
Great find man, just went through something similar on a Silverado.
Where are you connected with the scope? This is definitely a training video . Thanks for this and all you do.
Most excellent video, thank you so much for sharing your knowledge!
MrsSunshine75 thank you for the kind words. Your welcome:)
I Will great video and happy new year! So if I didn’t have the Tech2 doing this test And the ability to print each one separately, I only have the ALLTEL, besides going through and Unplugging each module separately, while I have my scope hooked up, the easiest way to check to see which module is bringing it down would be to jumper each one and watching the network how it reacts correct? Thanks and keep up the good work, Doug
BigFoote Mobile Auto yup absolutely 👍 and the Alltel would have worked just fine for this entire job. Keep it plugged in the DLC just like I did with the tech2 and you will see the modules come on. May need to keep doing a system scan🤔 good question. Should work...
We went for the tech2 just in case the ALLTEL was being goofy lol
Plus being a OEM tool it’s much faster and easier..
God bless you have a blessed day today 🙏
Thank you 🙏
Great video. Can you use the autel auto scan as a "ping" to see if modules pop up? My shop doesn't have a tech 2.
Michael Herbert thank you! Yes I do believe we could have used the autel throughout the entire job... we went for the tech2 because we had it and wanted to verify a second scan tool had no com.
The tech2 will be much easier since it’s made for the job of course However I’m thinking with the autel you might need to keep repeating system scan and see what becomes active.. I’m not 100% but sure there is a way
I know this is an old video, and I'm not even sure if the information I have is correct, but isn't the datalink supposed to have pin 6 populated? The service manual at Operation CHARM states that the rendezvous communicates via high speed GMLAN and the class 2 network, and it mentions:
Home >> Buick Truck >> 2005 >> Rendezvous FWD V6-3.4L VIN E >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Relays and Modules - Computers and Control Systems >> Body Control Module >> Description and Operation >> Data Link Communications
The data link connector (DLC) is a standardized 16 cavity connector. Connector design and location is dictated by an industry wide standard, and is required to provide the following:
- Scan tool power battery positive voltage at terminal 16
- Scan tool power ground at terminal 4
- Common signal ground at terminal 5
- Class 2 signal at terminal 2
- GMLAN High Speed + circuit at terminal 6
- GMLAN High Speed - circuit at terminal 14
I got excited for a moment and double checked, and unfortunately female pin 6 was not populated, and there were only 4 female pins and 4 wires (battery, ground, ground, and class 2 signal)
excellent job very helpful
My favorite is when I get called to a shop to help them diagnose a problem and I don't even use my own diagnostic equipment. I use their equipment to help fix the problem.
Greg J Feeney :) that’s a good feeling indeed
Great video. Thanks for posting
If I were to use a scope and back pin two leads to see what you were looking at what wires would I use?
I noticed in alot of advanced tech videos. Almost everyone is using a harbor freight test light. It's my favorite light.
Greg J Feeney it’s a great test light 👍👍
Advanced and harbor freight don't belong in the same sentence. It must have been your first and only test light.
Loved the video - THANK YOU!!
Silly question, what do you use to "jump", looks like a piece of coat hanger. Is there any concern of material type, solid copper wire, aluminum something or other... diaper pin?????
great video with lots of info thanks
gonz garr thank for god the compliment and feedback
Hi. Great explanation, thanks!
I have slightly different problem. 2007 Chevy TrailBlazer
Without any DTCs message "Stabilitrak not ready" and then "Stabilitrak OFF" appears on IPC display. I understand, it means, that EBCM can't initialize all sensors and other, to make sure, that ESP don't kill you🙃. But main problem is, that there no any DTCs in EBCM, at all. But there is U1166 (both driver and passenger doors) and U1019 on SRS. All succesfully cleared, but Stablilitrak issue don't go away. Maybe you seen that before, or can tell me, which way to go with diag. Thanks!
Thanks Will. Have a great new year !
Ron Baynes your welcome and thank you!!!
WOW! Very informative video! I sure learned a lot! I have 2011 Colorado throwing intermittent module error codes like this. Wished I had access to the data and schematics to run it down to which module is dragging down the others? Body panel module and fuel pump modules keep throwing codes on warm days only. I've replaced the fuel pump module but it did not help. Maybe my rear door wiring harness has pinched the wires off again or shorted them together making the body module drag down the network? Thanks for the video! I wished that you were near me? I'd gladly pay you to run down my problem and even pay a bit extra to watch you do it and learn!
Hello, very useful information I'm working on 06 hummer H3 got this code U1041 no communication with ABS module and brakes won't work at all. I don't see a splice connector can you tell me if this car has one thank you very much.
Great video. I know this is an old video. I hope you see my comments and respond. What is the program or source of the technical documentation? What is the best all around scanner? If Tech2, how do you make sure you can diagnose and/or program modules or features? What is the language standard for 2000 - 2006 GMC Yukon and Sierra? Thanks in advance!
Enjoyed this video. Some great learning points in there. Thanks.