Awesome video and great way to see a pragmatic approach to tracking down multiple issues. Would love to see the rest and maybe show the process for programming 1 of the modules?

👍 keep filming! Anything you share is golden. Probably not too many techs that could figure that one out. Thanks for sharing.

Not even a question man of course we want to see the whole thing

Wow! This is crazy for sure and filming makes it even harder! Thanks for sharing and I'm sure everyone would love to see the outcome of this one.

This is better than any soap opera I’ve ever seen! Cliffhanger, can’t wait for Episode 2!

Please continue to film, learn a lot from your channel. Bless

Of course keep on filming. What are your guesses on what took out all the modules and that BCM was smoked bad! I assume CAN is 12V tolerant, but could someone maliciously hit it with 24V or more? Welding done on the truck, lightning, alternator go nuts? What industry is the owner and truck involved in? Did he just come out one day an no start? So many questions.... Common link so far is the HS CAN, but not sure about LIN bus modules yet.

I'm all for what ever you're willing to share. Every experience, virtual or otherwise, is still experience.

Gotta see part two. You make it look easy.

Moral of the story: if lightning strikes (or someone backwards jumps) your new computerized vehicle, just have it towed to the junkyard haha

I had to rewatch this one, I like this video man! Don't you just love how they make all their changes depending on RPO's I really love when they don't tell you specifically in SI too 😂 ohhhh...😂😂...GM You forgot the trailer lighting control module and/or the Trailer Brake Control Module 😂❤ Watching your vin scan reminds me of watching our national debt😂... Like I said man this is an amazing video!

Nicely done. I'd say you and Pine Hollow Auto Diag have become my 2 must watch channels. Your channel is going to go to the moon, as they say.

keep the camera rolling please. we are all hooked.

Just by the title, this should be good. Simple and effective approach to check bus integrity and potential shorts. A lot of modules down - doesn't look good, if powers and grounds check. Got horrified after seeing the BCM (reverse polarity jump attempt?). Great job unraveling this pile of problems, Jake! If you keep working on it, it should be interesting to see how far the carnage went 🙂

I learn a lot from you, you are truly a teacher

That was great, thanks for the video. Like an electronic séance - trying to communicate with the dead. Looking forward to the rest of this truck's repairs. You're one of the best channels for this kind of work there is.

It has been over 12 years since I have done a split search electrical diag, but those kinds of tools were never available to us onless you paid out of pocket, and before you know, they become shop tool's because everyone wanted to borrow. So, to keep the peace, you will never acquire keep up the good work

More please always great content. Could watch all day keep them coming

Keep em coming! Great videos

Keep them coming! Great content.. 👍🏻

Keep filming on the truck. Always appreciate your time , always an opportunity to learn from your experiences. Thank you

I learned something today. You're very good at this stuff. Your shortcuts are very interesting.

Imagine working at a dealership getting paid .3 hours to diagnose this problem. The perfect Monday morning vehicle to work on.

Thanks God for that experience under your belt. Not an easy task. Great work, thanks for sharing. Am ready for part 2.of the great video.

Thanks for sharing your diagnostic process! I would’ve given up. Yes please show the follow up!

Yes sir!! Please continue with the filming, your video is very interesting and very helpful

Crazy case study for sure. I would love to see the resolution to this one.

Great video, can bus -still working on understanding it. Definitely want to see more of this one. You are one of my favorites along with Pinehollow, South Main auto and super Mario diagnostics.

Great stuff, please keep going.

Excellent, cutting down the network then finding the P&G's, then dead modules galore. really interesting keep filming.👍

Thank you for your time. Couple months ago I check a similar truck. Almost same issues, I am a mobile technician. The shop did not provide me with any info other than a start stall engine. After running several test, I found a BCM staying on all the time, and a PCM not seeing a wake up signal voltage (btt volt). Well it was my first time seeing two modules faulty. I did not fixed, the customer took it to the dealer. At the end I feel comfortable for knowing and learning on all this KZfaq channels. Thank you very much SR...

great video and diag , lot of blown modules !!!!!! ya customer sure has the right man on this job...... good job Jake , be good to see the follow up .. cheers

I am looking forward to more on this one Thanks

Brother, I would like to see this repair to the end , this trouble shooting is on point thanks

Hec yea I want to see more what a cliffhanger I am looking forward to the conclusion 1 out of Ivan’s play book 😂😂

Great video. Keep going!

Those Banana jack leads for your test lites look great! I did it for all my test lites, about 10 of them in different amperage ratings

32:46 haha, sums up this entire video, good work Jake 🙂

Great video, as always! Customers not always say the truth.. I got Volvo with issue - power windows not working.. In reality, they didn't tell, that drivers door was replaced.. I figured it out only by missing wires in door harness.. 😂

Keep filming it was so good and well done....

Page #2 waiting....can't wait...😊

Excellent video jake.thanks waiting to see update.

Nice video and diagnosis. If you have time please share the rest. It would be nice to see it driving down the road after it’s fixed.

I'm sure you told the customer about the high cost of replacing many modules now and possible intermittent electrical problems in the future with the harnesses and other components. This video and the next will make for some great diagnosing. I just hope the customer understands the costs and possible future costs.

Yep keep filming. This is a good one. Tks.

Yes Jake keep going if the customer oks it!

These hard to troubleshoot videos are the ones I like best. Looking forward to watching the conclusion of this repair. Was Lightening the cause of these failures, or perhaps this is a flood vehicle (which are showing up a lot more in the repair shops)?

Keep on filming. Love the crazier ones

Sure Jake, I'd like to see you continue the autopsy on this vehicle.... : )

Definitely want to see more of this. I would have been too chicken to tackle this. If possible, I'm curious of the cost of the repair.

Do post a video if they approve the further repairs. Thanks for sharing as always!

Definitely the whole story. Especially the Lin bus. That ECM was definitely beyond repair. It really looks like a lightning strike car/truck. What else could cause such destruction? Thx for sharing!

Appreciate your knowledge keep going

glad it was you and not me good job please bring us back for the final fix

Great job keep filming👍

Oh no, somebody let all the magic smoke out of the bcm😲 Yes, I think we all need to see the final outcome........I gots ta know😊

Keep going!! Im on the hook now lol

Great Video!

Keep them coming

😅 Wonderful. Let's see it through to the end.

My God...this truck was plug in to wall socket to get fully charged 😂...man...that's some serious troubled truck 🚚...good luck with repairs....cheers

I'd jump up on the bed real quick and look over the roof and the hood and see if it has any burn marks in the paint. Because it definitely seems like it got struck by lightening-- or maybe someone hit this truck with a welder somewhere and had their ground in a bad spot and pulled some juice through all the modules somehow. IVAN had a car like this not long ago, and it was from a welder burning through a hole under the seat (from under the vehicle) and hitting some wires with his welding rod. Fried a bunch of modules just like this one. crazy stuff.

Love this...❤

Yeah keep going, we want to see the end.

Hey Jake, I love the channel! @4.02 how did you figure out that you had a short to ground using ohms on the DLC and monitoring the canbus lines? Thank you in advance, Jake I really appreciate the hard work you put into these videos!

Love it

Of course I want to see more! Lol!

Yes definitely we need to see the end result of this truck...

Don't leave us hangin! Melting my brain into goo is not complete yet

I wish all modules got smoked like that BCM, makes it way easier to call it a problem haha

Yes, keep filming

Keep filming 👍

Well Jake it looks like that severely burned up circuit board has taken out just about every other circuit. Hopeless what ever caused the board to burn up doesn’t happen again and burn up all the new modules . Did the work order say there was a strong Oder of smoke? From the looks of it I’m surprised there weren’t flames. Thanks for sharing and keep an extinguisher handy Lol. 👍

Good job, i do diags as well on my channel, that bcm was overdone for sure!

From an automotive electronic module design stand point, module power is protected against electrical overstress (spikes due to induction), ESD and reverse battery connection or reverse jump, and sometimes double battery jump. How robust the protection is relative to the specific type of fault is what is usually not known, except for ESD (ISO 10605) which is strictly tested. In my experience the weakest link is double battery jumps (24V jump). However, I think reverse battery is not strictly protected on all vehicles. So, installing the battery backwards may damage modules. But, there is a lot here that does not make sense from a systems design standpoint. For example, you would think that the most robust module would be the gateway/BCM. But, many times the BCM will be one of the first to fail. In my long career, I have not worked on a car that actually had a known lightning strike which resulted in an electrical failure. But, I suppose it is possible to damage modules this way. If we look at the HSCAN network, the Module Engineers had to make a choice about how to daisy chain the HSCAN network; on the harness side with a splice at the module connector, or inside the module, which takes two extra pins on the connector (both male and female) and requires cross connect routing on the module PCB. From a generic network architecture having essentially CAN in and CAN out is flexible in routing the harness because you can add external termination to the end module which ever it happens to be without using splices in the harness. If you have a bad module pin on one of the CAN signals (CAN in or CAN out) you will lose bus termination and the network may not communicate. If a harness splice was used it would not matter if a module pin was bad. Having modules (and mating connectors) underneath a vehicle without a secondary enclosure to protect it from the elements is crazy. Having wiring harnesses underneath the vehicle is also crazy, but a harness can be sealed and routed in such a way to minimize salt spray intrusion. If we look at the modules in the rear of the truck in the video, the connector wire input harness side faces towards the front of the vehicle, which again, is crazy. Modules and harnesses underneath a vehicle will not survive long in the salt belt. Which seems to be rather stupid from a GM truck standpoint, because there is a truck plant in Pontiac Michigan and the GM Tech Center (Engineering Center) is in Warren Michigan, and Michigan is most certainly in the rust belt and a place where salting the roads is extreme. I don't really use traditional bulb test probes or custom bulb test lamps any more (I don't like the inrush current and the inexact current load at steady state), except when troubleshooting bulb circuits. Instead, I use my Fluke DMM on DC Volts with custom low inductance resistive dummy loads of 22 Ohm and 6.2 Ohm, which provide a known load of approximately 550mA and 2 Amp with a 12.4VDC main voltage respectively. The power resistors are mounted on a small heatsink and mostly covered in heat shrink tubing to allow for heat dissipation. If I know the load, which I do, and I know the voltage, which I do, I also know the current. In automotive testing you will see as a trend to use a small load when testing power feeds and grounds this is to determine if there is a high impedance connection which you will not see with just a DMM due to its high input impedance. In my career, I see two basic groups when it comes to bulb testers vs. DMM testing. If you start as a diagnostic technician at a high end dealer or an Automotive OEM you will not see bulb testers much, because they are not issued and sometimes banned (like at an OEM), generally you will have access to (or maybe get issued if you are lucky) a DMM, usually a low end Fluke, like the 115 for example. Many senior techs will have a Fluke 88V. I purchased a Fluke 87 which I used for about 10 Years and replaced the LCD screen once. I also had on my bench a used Fluke 8050a which I repaired and still have today. I really like the old 8050a for a basic bench meter. I know this may sound stupid but if you are working with other high paid techs, it is better to pull out a Fluke 88V to do testing than a bulb tester. If you work by yourself, do what ever you want. If you are working around OEM Module Engineers never use a bulb tester.

Be careful with them aftermarket scan tools on these newer one's too brother; because even with Techline/MDI Factory Scan Tools, we all know, that somtimes, DTC'S don't like to clear, ESPECIALLY during a system wide dump...unless you ACTUALLY go into the module through GDS2 and clear them...silly but true story! You probably know this I just wanted to let you know or anyone else out there to be aware. Don't forget you can always do a global too, To allow that car to fully power down and discharge...then go drive it and see.?. That's my thoughts Curious to see your approach Proper programming,..SDM setup and configuration, as well as, immobilizer learns, and power down is critical as well. They have made improvements in their instructions on that🎉🎉🎉🎉😊

Another great diagnosis , I enjoy seeing these problem cases, have you tried to use RLS website that Sean Tipping talked about in his podcast to know for sure if that truck has a transfer case module, why I'm asking I can't find the RLS website he was talking about

Dont leave us hangin’

Lightning or welder are the first things that come to me after looking at that smoked module. The damage is catastrophic.

Definitely have to finish the repair on video for us curious to know if it fried every module

It's a ground problem , most likely the ground strap for the cab has failed. This has become a common problem...it's located down under the passenger side of the cab in the engine bay right behind the right front wheel.

Please continue on part 2. Really crazy case study. What was the reason for all these failures?

oh yes sir would love to see the rest of that done . spot on with the can diagnose. had a similar issue this week . hybrid can plugged in 120 ohms . plugged in around mid of circuit unplugged one of the terminated ecu’s 120 ohm went away so went the other way found the nearest plug to the mcu no 120 ohm unfortunately for tge tech had to tell him he needs to remove the fuel tank and hybrid battery to gain access to the mcu don’t think i made his day

Great troubleshooting and approach! What ended up fixing the start stall issue? Did you have to set up the Key in the SDM?

Just a quick interjection, and I noticed you [weren't required to?] inspect/document all the BCM's circuit integrities B4 installing a new one? But forget about that for a moment! and I'll get back to the point: Considering the condition of the BCM, internally, and the fact that the 'wake-up' signal *initiates* from the bcm on this vehicle, couldn't you just loop-in/out all the BCM bus circuits -- leave no bcm installed -- then jumper in your own wake-up voltage to that circuit and see who else might be able to respond to a scan? Oh yeah -- awesome work, keep it coming! Quick edit: if you backprobe the wake-up wire on (a good vehicle), on (any of the vehicle devices that receive that signal from the bcm), just sticking the key in the ignition lock cylinder will trigger a 12 volt wake-up signal, you don't even need to turn it on. Sometimes it comes in handy. 👍

Interesting case. If you're planning to dive in further, please put it out on KZfaq. The amount of damage in the BCM is very impressive. If lightning did that, then would be great to find out how it found its way to the BCM. Maybe there's still markings of that hit, somewhere on the body of the car. Or does this car belong to somebody who does lots and lots of tinkering with the electrical system, knowing that his modules are well protected by fuses from the eBay Special automotive fuse assorti super heavy duty long life 500pcs for $4.99 with free shipping?

Yes continue filming and give us an estimate of how much it cost on just the MODULES

Take us along!

Keep on going this old boy is going to have to rob a bank to paid to get it right .your right I bet he hooked up the battery jumpers wrong.

As an automotive locksmith I get these calls a lot. I turn everyone of them down. "My key needs to be reprogrammed". I explain there is no such thing. I tell them to take it to their mechanic or dealer for a proper diag. I tell them I am 99% sure a new key isn't going to fix their issue plus they won't pay me after it doesn't fix the issue. They argue and argue but I refuse 100% on them.

👍👍

some one obviously hooked up a battery charger backwards and on full boost. Or tried to jump start backwards. expensive oops!

What is the identification in HVAC module..? Keep up the good work 💪..!

Keep Going Please...

Please do a follow up filming!

yes please

was there any welding done. thanks for video

I know from experience, nothing makes you feel more alive than kneeling or laying on gravel.

Yes let’s see what happens

Looks like someone had the battery cables backwards. From what I've seen, that's the normal cause.