Anybody and everybody who is in the automotive diagnostic field and say they are serious about there trade had better not miss any and all training that Mister Bernie Thompson has to offer thank you sir for your time .
Bernie, that was fantastic! Thank you for the tips on GM Bus communication strategies. So did the original camera actually fail, or was the broken comm wire the issue all along?
That is GM low speed LAN per SI. Just did a 17 Yukon with intermittent Low speed LAN crashing..Wiring harness was rubbed through on steering col.bracket GM calls both High and Low speeds LAN (local area network).
In GM service info there is a document called "Data link references." As GM dealer techs we always have to check that for the modules in question so we know every single network that module talks on.
Where was the pinched wire. I have exactly the same problem. Only thing is that randomly I get “ park assist fault “ - I have a lot of lost combustion codes, but when I get the park assist fault - magna ride suspension goes in full stiff mode and it’s unpleasant to drive ☹️
So the only thing delaying the diagnosis was that you chose aftermarket wiring diagrams. Using the OE diagram it would be evident in the initial system overview . Either way fixed and thank you for the video
I would of used the other gm software, that diagnoses can communications.gm in 2015 came out with with the the software and its great cause you can check all modules live and pings each module.so it tells you if it's communicating..as soon as I saw it was communication issue,I would of stopped using gds and used gm can software.there is a tsb on how to us that new software.you should you into if diagnosing gm can
That's ridiculous! Several pitfalls there to send a mechanic astray. Little wonder that diag is now almost a separate job. So little effort by manufacturers to design systems that are easily worked on.
These manufacturers need to get their stuff together. People who don’t know any better say things like they’re making it harder for us independents so they wind up back at the dealership but the evidence shows that it’s not the case and they are just flat out incompetent. If that were the case then these vehicles wouldn’t be ending up in the hands of people who know how to think outside of manufacturer flow charts to finally fix the problem. It’s sad when the dealerships have a bunch of cars come through that they don’t have a clue on how to fix because of their own foolery. Just like that diagram missing that Gmlan wire. How does that get left off of a communication bus diagram? It’s ridiculous and our industry is full of this kind of stuff. It tends to help me because I get quite of few of these problem child vehicles brought to me but I can’t help but feel for the other techs in the industry with less knowledge/experience. I get irritated sometimes because I feel like I’m constantly on the phone with peers helping to give them direction but where else are they suppose to turn to when they can’t trust the information that supposed to guide them.
Of course, the customer. The dealers love to run up a huge bill replacing a bunch of likely suspect parts, then send the customer on there way just to have the customer discover, 10 minutes after drive off, that problem not fixed. Then, the service writer will spend more time trying to convince the sucker to spend more money than the "tech" spent diagnosing the problem in the first place.
MY guess was it probably had a accident, replaced camera then they discovered a problem that wasn't apparent due to the camera being out initially either due to a bad wire, etc. Still watching as he's just getting wiring diagram. It'll be good I'm sure! 👍
Data Communication Schematics Figure 1: Data Link Power and Ground, and Low Speed GMLAN (1 of 2) Figure 2: Data Link Power and Ground, and Low Speed GMLAN (2 of 2) Figure 3: Gateway Isolated Low Speed GMLAN Figure 4: High Speed GMLAN (1 of 2) Figure 5: High Speed GMLAN (2 of 2) Figure 6: Gateway Expansion High Speed GMLAN Figure 7: Gateway Isolated High Speed GMLAN Figure 8: MOST Communication Bus Figure 9: MOST Bus Communications Enable Figure 10: Chassis Expansion Bus (1 of 2) Figure 11: Chassis Expansion Bus (2 of 2) Figure 12: Powertrain Expansion Bus (L83 or L86) Figure 13: Object Detection Bus (UGN+Z75) (1 of 2) Figure 14: Object Detection Bus (UGN+Z75) (2 of 2) Figure 15: Linear Interconnect Network (LIN) Busses (1 of 3) Figure 16: Linear Interconnect Network (LIN) Busses (2 of 3) Figure 17: Linear Interconnect Network (LIN) Busses (3 of 3) (X88 or Z88) Figure 18: Linear Interconnect Network (LIN) Busses (3 of 3) (Z75) Figure 19: Accessory Wakeup Figure 20: Communications Enable Figure 21: Communications Enable - Object High Speed GMLAN all the comm lines on this vehicle from GM SI
Anybody and everybody who is in the automotive diagnostic field and say they are serious about there trade had better not miss any and all training that Mister Bernie Thompson has to offer thank you sir for your time .
Amen to that!
Anther great video. The power of diagrams! Thanks for sharing your knowledge.
BERNIE, you are AWESOME thanks for opening my eyes for new level of diagnostics.
He is the man wow one day wish I can gain this level of know how
Thank you so much Bernie for this great video and information you share with us!
Excellent video and diagnosis Bernie. Thank you for bringing us along and sharing your diagnostic process with us. Great information!
Another excellent video Bernie! I am thoroughly enjoying this run of communication videos you are posting, Im learning something new each time
pull the key out please......wow very good video.....you should be working with me, everyday.......ha ha the dream teacher....
It is push button start
Thanks Bernie! Always great learning from you.
Great Info Bernie! Thanks for taking the time to share.
Jeff
Master in craft 👍
Bernie, that was fantastic! Thank you for the tips on GM Bus communication strategies. So did the original camera actually fail, or was the broken comm wire the issue all along?
Pine Hollow Auto Diagnostics good question.
Awesome videos as always. Bernie your the best!
Great diag. Finding proper system operation descriptions and communications diagrams seem to be increasingly difficult.
That is GM low speed LAN per SI. Just did a 17 Yukon with intermittent Low speed LAN crashing..Wiring harness was rubbed through on steering col.bracket GM calls both High and Low speeds LAN (local area network).
In GM service info there is a document called "Data link references." As GM dealer techs we always have to check that for the modules in question so we know every single network that module talks on.
Good job man .thanks for this tips
Pretty sneaky man. Great great tip! That would fool a seasoned tech for sure. Awsome
excellent video thanks Bernie
Awesome
Even the mediocre utubers r watching this genius!!!
Wow! Seems you speak all communication languages ;)
Wow sneaky. Amazing
Where was the pinched wire.
I have exactly the same problem.
Only thing is that randomly I get “ park assist fault “ - I have a lot of lost combustion codes, but when I get the park assist fault - magna ride suspension goes in full stiff mode and it’s unpleasant to drive ☹️
Legend
Multiple wiring diagrams because one did not have the "VERY MUCH NEEDED" wiring information.
So the only thing delaying the diagnosis was that you chose aftermarket wiring diagrams. Using the OE diagram it would be evident in the initial system overview . Either way fixed and thank you for the video
I would of used the other gm software, that diagnoses can communications.gm in 2015 came out with with the the software and its great cause you can check all modules live and pings each module.so it tells you if it's communicating..as soon as I saw it was communication issue,I would of stopped using gds and used gm can software.there is a tsb on how to us that new software.you should you into if diagnosing gm can
That's ridiculous! Several pitfalls there to send a mechanic astray. Little wonder that diag is now almost a separate job. So little effort by manufacturers to design systems that are easily worked on.
These manufacturers need to get their stuff together. People who don’t know any better say things like they’re making it harder for us independents so they wind up back at the dealership but the evidence shows that it’s not the case and they are just flat out incompetent. If that were the case then these vehicles wouldn’t be ending up in the hands of people who know how to think outside of manufacturer flow charts to finally fix the problem. It’s sad when the dealerships have a bunch of cars come through that they don’t have a clue on how to fix because of their own foolery. Just like that diagram missing that Gmlan wire. How does that get left off of a communication bus diagram? It’s ridiculous and our industry is full of this kind of stuff. It tends to help me because I get quite of few of these problem child vehicles brought to me but I can’t help but feel for the other techs in the industry with less knowledge/experience. I get irritated sometimes because I feel like I’m constantly on the phone with peers helping to give them direction but where else are they suppose to turn to when they can’t trust the information that supposed to guide them.
Who pays for the new camera which was not needed?
Of course, the customer. The dealers love to run up a huge bill replacing a bunch of likely suspect parts, then send the customer on there way just to have the customer discover, 10 minutes after drive off, that problem not fixed. Then, the service writer will spend more time trying to convince the sucker to spend more money than the "tech" spent diagnosing the problem in the first place.
Ленивый дед не стал искать обрыв. Жаль.
MY guess was it probably had a accident, replaced camera then they discovered a problem that wasn't apparent due to the camera being out initially either due to a bad wire, etc. Still watching as he's just getting wiring diagram. It'll be good I'm sure! 👍
Data Communication Schematics
Figure 1: Data Link Power and Ground, and Low Speed GMLAN (1 of 2)
Figure 2: Data Link Power and Ground, and Low Speed GMLAN (2 of 2)
Figure 3: Gateway Isolated Low Speed GMLAN
Figure 4: High Speed GMLAN (1 of 2)
Figure 5: High Speed GMLAN (2 of 2)
Figure 6: Gateway Expansion High Speed GMLAN
Figure 7: Gateway Isolated High Speed GMLAN
Figure 8: MOST Communication Bus
Figure 9: MOST Bus Communications Enable
Figure 10: Chassis Expansion Bus (1 of 2)
Figure 11: Chassis Expansion Bus (2 of 2)
Figure 12: Powertrain Expansion Bus (L83 or L86)
Figure 13: Object Detection Bus (UGN+Z75) (1 of 2)
Figure 14: Object Detection Bus (UGN+Z75) (2 of 2)
Figure 15: Linear Interconnect Network (LIN) Busses (1 of 3)
Figure 16: Linear Interconnect Network (LIN) Busses (2 of 3)
Figure 17: Linear Interconnect Network (LIN) Busses (3 of 3) (X88 or Z88)
Figure 18: Linear Interconnect Network (LIN) Busses (3 of 3) (Z75)
Figure 19: Accessory Wakeup
Figure 20: Communications Enable
Figure 21: Communications Enable - Object High Speed GMLAN
all the comm lines on this vehicle from GM SI