Dodge Grand Caravan: No Power Window No Power Locks - CAN Trouble

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Let' come along with Eric O. at the SMA shop as he has a look at this 2008 Chrysler Town And Country that came in with a complaint of no power locks and no power windows when operated from the drivers door. This vehicle takes Eric O. on a path that he is not to familiar with and that is diagnosing an Interior CAN ( controller area network ) system. Lets grab the trusty scope on the rope and the Autel and have a look!
Be sure and check out the all new "Outdoor w/ Eric O. Channel" too! / @therealerico
Interested in stuff seen in the videos or the tools and toys Eric O. likes and uses? Check out the *ALL NEW* SMA A-Store and help support the channel! : astore.amazon.com/httpswwwy083...
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THANKS!
--Eric O.
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Disclaimer:
Due to factors beyond the control of South Main Auto Repair, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. South Main Auto Repair assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. South Main Auto Repair recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of South Main Auto Repair, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not South Main Auto Repair.

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28 авг 2016

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Комментарии : 584

@jackejr74 2 года назад

I have NEVER seen the use of a little Back Electrical Tape be a bad thing! I like your style!!! You have the integrity and ethics to go the extra mile to make sure the repair holds up!!!! Great Job SIR!!!

@mikechiodetti6737 5 лет назад

NEVER APOLOGIZE when doing electrical diagnostics ! ! When others question your time to locate the problem, they're probably parts swappers or parts cannon users! AND we all learned something about that (no longer) mysterious C.A.N. NETWORK ! ! Thankyou for a Great Video ! !

@ernielivingston8194 3 года назад

Lllll

@ernielivingston8194 3 года назад

@timothypelley7825 4 года назад

First time watching your channel this evening I had similar issues with my 09 grand caravan and thank God you did this video. It saved me all of the trouble and hassle. I went directly to the harness and at the connector I found the white wire with the gray tracer stripe broken soldered it back together and works like new. Thanks for this informative video.

@dubsdubs2317 2 года назад

This guy is great! I wish I knew him in my 30 years of growing up in Chicago. I think my town and country's problem is a rear blend actuator, but this guy makes the best videos. I hope he makes some more about T&C's. Thank you very much Sir.

@SuburbanBeard Год назад

thats the same issue in mine!! i deal with the blinking defrost button!

@vr66luke 7 лет назад

If I thought 1/16 of mechanics were as competent as you I would have a lot more free weekends. Good job as always Eric!

@athhud 4 года назад

That is the truth! I’ve even started mounting my own tires, because I have such little faith in the local shops. The only thing I hire out is road force balancing. If there were an economical way for me to do that myself, I would...

@alanpulsipher9664 3 года назад

Just because you can do it does not mean we all can. Do it, you have all the tools and knowledge and experience. And you are good and honest, to bad all service techs were as competent and hostess as you. Mrs. O is so lucky and your children are cute as buttons.

@wyattoneable 7 лет назад

There is so much talent in this community. It's good to hear that guys like Keith, Ivan and Paul are available to you. I enjoyed the process. Yes, it became apparent it was a broken wire but for guys like me who like to see some scope action, it was time well spent. Thanks again for letting us hang around the shop.

@TheDisgruntledMechanic 7 лет назад

Ditto!

@dougdaniels4597 2 года назад

Just did this repair yesterday. A basic repair after watching your video. Customer states her 2008 Chrysler Town and Country had intermittent wiper and headlight activation, audible bell sound, dash lights all flash , tach and speedo stop working when idling and/or when driving down the road. Windows and locks also not operational. Quick diagnosis and located a white with gray line wire broken in driver's side front door harness by the door jam connector. Solder repair and heat shrink installed. I am still amazed this one broken wire could cause so much chaos.. Also , customer states drove vehicle for a month because she thought it was haunted and she feared a mechanic would condemn her vehicle. Thank you for the informative video.

@txc500 2 года назад

Is there a trick to getting the body side of the harness off and reinstalled so it's water tight?

@dougdaniels4597 2 года назад

@@txc500 I pulled the wire protection sleeve back to inspect the wiring harness. I did use a screwdriver to release the tabs on the plastic connector to unplug it by the drivers door kick panel. . I replaced all parts and the sleeve which I messed with for 20 minutes to put back in place correctly. Maybe use silicone to waterproof the connector.

@bartomand3681 4 года назад

Watching your videos 3 years later (Sept 2019) and I think you are mastering these COMS and Networks. You don't only need to know the mechanics, but need to be a computer tech to work on these things nowadays. Great job Eric! Keep evolving, keep learning!

@irepENC 7 лет назад

Don't sweat it Mr. O, any technician that says they're good at everything are lying. The difference is your man enough to admit and don't let it stop you from doing what you do. Mad respect for you, hope to be half as good as you some day, don't let all these haters get to you.

@SouthMainAuto 7 лет назад

Well that is why I am a mechanic and not a tech. I know when I don't know. However I ask learn and move on :)

@passiton3801 3 года назад

Talk about having the patience of Job. The man is the epitome of it!

@JohnDoesGarage Год назад

Ice cream is my kryptonite. I am just learning how to troubleshoot networks and watching a video where you are learning is actually quite helpful because I was following along with your thought process. My logic seems to be very similar to yours so it was almost like I was doing it as I watched you. Thank you for a great learning experience.

@phillipswain4312 4 года назад

I'm a dealer tech and honestly based on my training my diagnostic work would be done as soon as I saw the broken wires. We'd just throw a wiring harness in it. But I know I don't feel a whole lot of pride doing that compared to what I'd get if I repaired the wires myself. Good work!

@somewhereinontario1500 Год назад

Time and time again I come to your channel to get your help. I’m going to check my harness this weekend cuz I have this exact issue suddenly. Thanks for being here 👍

@jayhulko1586 4 года назад

You are a lifesaver! I was having the exact same problem with a 2010 Caravan, but didn't have the scanners that you do. Thanks for saving me the trouble of shipping this vehicle somewhere else!

@ThePlowGuys 7 лет назад

*Eric saves the Day* not to mention hundreds of dollars for the customer. I just bought a new Ford *Escape* and I am sure I will need this type of info. Cheaper to spend an hour of my time that paying for it at the dealer. Around here there really isn't anywhere I know of that does anything close to what you show here on your channel. Great Job *Eric* as always. -John

@steveodonald9503 4 года назад

I know it's an old video, but great job once again Eric. You taught yourself some things, and you taught us some things. I hope you did get to those classes (Havn't seen any videos of you mentioning that so far). Once again, love your work.

@kurtkennedy5370 7 лет назад

When I was at mini cooper I had a new car off the lot with the same issue. Found the Passnager side mirror bringing down the Driver switch and LIN bus. Its always a pretty fun day when you have to put your thinking cap on and not do the same stuff day after day.

@denniswilkinson1118 7 лет назад

Well done Eric, another lesson in rocket surgery . Your patience is over the top. Great video. Keep'em coming.

@joetiller1031 7 лет назад

Makes me glad to have manual windows and locks.

@777warhero 7 лет назад

I don't miss those manual door mirrors. Huge PIA to adjust the passenger door.

@cobraninetysix3883 7 лет назад

Hey...., what's a world without a little from our friends! Outstanding! This is what will separate the shops in business from the ones that don't keep up with the changing times. Great video!

@jasongraham882 7 лет назад

After your class it would be super awesome to pass on anything interesting you can! I also have very little understanding of the CAN networks! Thanks for all you do ! I have learned more from watching RU-vid videos from pros like you, scanner Danner, and Ivan than I did from any book or class I have taken !!!

@michaelherbert8213 7 лет назад

IMO this was by far your best, most informative video. Thank you so much for your time. I'm going to watch it again and take notes lol.

@jdub6782 7 лет назад

Ericthecargu Eric O.... No need to take that can class.....Your knowledge is priceless.....I admire your patience and perseverance to figure out the solution. Thank You much for all the great videos.

@brianbutterworth8186 19 дней назад

I just bought a used 2010 Chrysler town and country van and the drivers window won’t roll down I’m going to follow your path see if I can get it fixed myself thank you for sharing. I always appreciate your videos they have helped me out many times in the past as well. Thank you for sharing your knowledge and experience

@arciefan 7 лет назад

Your common sense is off the charts. That's what makes you a stand out and the best mechanic I've seen on here. Your video and editing skills also serve to make this an excellent channel. Was the two alligator clips on the magnetic swivel base a home made tool or store bought as they say?? Can see where that comes in really handy as it's essentially extra hands to hold your wires. Thanks for all the great videos !

@haroldestevez4803 4 года назад

Thanks, I was braking my head still I saw this video. I just moved a bit the connections between the door and the car and now mirrors, windows and locks work great. Thanks.

@baxrok2. 7 лет назад

Great vid Eric and thanks for sharing this with us. Very cool that you talked to Keith about it. Sharing knowledge is a beautiful thing. A harness like that might just be found at the good old junk yard.

@philliptipton9371 Год назад

Never a dull moment...fire trucks, meat wagons....tangled scope wires... unidentified intruders through the front door... and it still getz fixed! I learned!

@wademosier3155 3 года назад

Great tutorial, my parents have issues with the passenger door not locking or unlocking. I tore the pnl off and it was clear someone had been in there before... I did t get to the harness yet... now I know what to look for...! Keep up the great work

@jalbie1875 4 месяца назад

All door controls when dead on my 2014 Durango except for the window controls for the two back door windows. My research online told me that the door module was bad.After watching your video I did what I learned from your video and discovered that possibly a bad mechanic cut two wires. The red and black wires passing between the door and body clearly were cut partially so they would break overtime . Thank you for the video that was well done.

@gman5209 Месяц назад

Great video!!! I love watching your videos Eric O. and i continue to learn so much from you, as a up and coming auto tech you give me the confidence to go out be the best I can be. Thank you so much!!!! Good diagnosing and plenty patience good stuff.

@ablelock 7 лет назад

Great video Eric. Sometimes electrical is challenging but nothing that we can't overcome with just a little patience which you seem to have a lot of. And I think going to that can conference will be a great deal of knowledge look forward to what you can share with us from there.

@jamesfrend2351 6 лет назад

Able Lock h

@davidwood4374 6 лет назад

I left the motor trade in 96. I don't remember anything like this. OBD was just coming in. Take my hat off to him! Good skills...Learn something new everyday.

@chrisjager4539 7 лет назад

Thank you for another great video. Thanks for mentioning the CAN Conference. I never heard of it till now. Signed up for the classes also. See you there.

@HUBBABUBBADOOPYDOOP 7 лет назад

As long as Manufacturers keep using plastic coated metal wires- the "Tap and Wiggle" test will always be used. This was an excellent video, as always, Eric. Thank you.

@SouthMainAuto 7 лет назад

Always tap and wiggle...yes sir

@mikechainz2245 7 лет назад

great video as always Eric. I got slid on an 05 Cobalt about a year ago( can bus no com ) what a nightmare. .lol but two days of scope on a rope a lot of reading and a lot of swearing..I found 3 faults .. 1)a break in The Wire driver's door 2)a bad connection at the main connector into the electric power steering.. and 3) an aftermarket radio with no can Communications.. the 2016 can convention sounds like a great idea I may see you there ...thanks again always I have never watched one of your videos I did not enjoy you are truly the best

@smtshrek3674 7 лет назад

Nice job Eric,CAN faults can been fun to find and sometimes a nightmare.i know how it feels to be weak at them and try to understand,the can class will help a lot.

@stevenakn1 7 лет назад

I took a class on can bus systems and the ones we learned about had replacement pins so you could install new wires. there are also some tools required but worth it. they don't recommend replacing the harness like you said there 2 expensive. another great job my man👍👍

@call.me.k.o. 7 лет назад

All in the the Details. At Lease you Recorded it for Us, and Proof that it was Previously a Repair that Failed. Thanks for Vid., Mr. O & Assistant Hanna.

@jakeandrus690 7 лет назад

Nice job Dr. O. Can systems are pretty interesting. I had one last week that had a wigging out steering angle sensor which pulled down the whole system. It's cool to see your approach. Take care

@throttletherapy9998 7 лет назад

The magnetic clip holding tool for soldering comes from lisle, Thanks for taking the time to scope the system and showing us how to understand these comm systems, I am also weak on these systems, but I am learning. Thanks again

@davescruton2829 5 лет назад

I am an industrial mechanic/troubleshooter/electrician and can bus is is a pain to find issues, especially in long strings. I was surprised to find they are in cars. I did not know that.

@JamesDoylesGarage 11 месяцев назад

Thank you so much for sharing your knowledge. I'm 17. This was so awesome to see all off this. Keeping car, we already paid the carbon foot print for , on the road, is the best way to save the environment. Can you imagine , trying to repair these new EV's?!

@geertvandenelsen6585 4 года назад

Good video Eric! Stay safe in these strange times! All the best from The Netherlands

@mtebaldi1 Год назад

Great video and tutorial on troubleshooting an electrical issue and how one problem causes other issues with communication.

@billymccagh5800 7 лет назад

awesome as usual Mr E. any body else doing that would say it needed a new connection well done keep up the good work fun watching.

@yeeyang4708 3 года назад

I had the same issue with my 04 colorado 211k miles, bought a use door lock switch didn't work try a brand new acdelco door switch, same thing, took apart the door wire harness, bingo 1 broken wire, solder it together, now everything works, thanks for the video.

@ahill007ny 7 лет назад

Nice job Eric!! This 2008 is already on its second engine 😱 I can't wait see that video and hear about its autopsy.

@comingundone27 7 лет назад

I just did a older Jeep Liberty. The guy wanted just the 5 wires repaired in the harness that were broke instead of a new harness. Needless to say about 4 months later, more wires were broken.

@johnwright5731 7 лет назад

Its always a problem fixing someone's elses fixes. They did their way and it lasted X years. Never easy and learning on the fly sucks. Good job and keep Hanna from the the hoses and cords!

@athhud 4 года назад

I’ve gotten extremely OCD with my electrical repair over the years. Ideally I would have a wall of wire spools in every possible color combination. Until my ship comes in though, in applications like this I use white wire and then match the OEM colors with an assortment of multi-colored sharpies. I was really hoping to see you depin this one. Obviously no one can keep every style of pin terminal in stock though. I think I probably would have depinned it and soldered my new wire directly to the pin if that was possible. Whether or not that would be better or worse, I don’t know, but I prefer to have as few splices between terminals as possible. In the past I have used a pick to uncrimp terminals and then crimp again on the new wire. It is no easy task though and can easily render a pin damaged beyond use if you aren’t careful. I am really looking forward to you learning Can Bus networking! I know the general concept. Troubleshooting and diagnostics are beyond my self-taught education though. It is very frustrating to me. There is virtually nothing I can’t do on the modern automobile. From setting up a differential to circuit board repair, I can do it all and am equipped to do it well. Data networking is my one weakness and there is more and more of it. As each year passes there is more data networking stuff crammed into vehicles and I remain as ignorant of it today as I was yesterday. I don’t know a single person that knows more about it than I do and my attempts to learn about it on the interwebs have not been very successful. There is not much out there and the little bit of information that is available starts off out of my league... Go forth and learn Eric! Then come back and educate me. :D Hopefully once you get learned you’ll have an influx of customers with networking problems. Lol

@passiton3801 3 года назад

Love them magnetic croc clips. Never seen them before, so useful!

@i1100ra 2 года назад

Thank you so much Eric. I have a 2012 Town& Country that is doing the same thing. I now know where to look.

@johnc4352 7 лет назад

A Controller Area Network (CAN bus) is a vehicle bus standard designed to allow microcontrollers and devices to communicate with each other in applications without a host computer. It is a message-based protocol, designed originally for multiplex electrical wiring within automobiles, but is also used in many other contexts. I did not know that, thanks Wikipedia.

@Friend_of_the_One-Eyed_Ladies 3 года назад

Yup, it's a brand new thing . . . since 1986.

@WTFJake86 Год назад

James C I know I am 6 years late but that is the most honest and no bs answer I have ever seen you rock PEACE ☮️

@uenragedbro Год назад

Congratulations. Now, what does it mean, what do you draw from that information?

@TheRooster1122 7 лет назад

Hey Eric sure enjoy watching your informative videos buddy! Your one awesome wrench!! Keep em' coming 👊🏼👍🏼👊🏼👍🏼👊🏼👍🏼

@geraldhinson 7 лет назад

Watching you playing with the CAN stuff here and watching Ivan restore the retro ZAZ in Russia. Quite the contrast! But, both are fun. I've spent 25+ years working with computer networks and you on cars. Our worlds are now colliding. I'm learning about cars and you about computer networks. :)

@sebry25ify 7 лет назад

always learn something new all the time. thanks for all the videos.

@randybrill5071 Год назад

Good job I must say. I’m trying to pick up things on CAN and this did help. Thanks.

@domjohnson2579 7 лет назад

Also the existing harness will most likely fail again in no time since its old so a new harness makes more sense to me. That being said I appreciate your efforts in trying to save the customer money and btw keep up the good work, your videos are great.

@adamtrombino106 6 лет назад

SInce a previous repair also failed, I agree. At this point I would stop and tell the customer that they need the door harness for a long term repair. I don't trust the rest of the wiring, even though Eric did a good repair on those 2.

@JoesAutoElectric 7 лет назад

Nice find Eric. CAN seems to be difficult more because we don't deal with it on a daily basis and tend to have to think more about it as we see them come in. Great use of the scope and comparing the known good module. Takes time to do this, but always better to be sure.

@NewLevelAuto 7 лет назад

MEA right? I have to know it's been bugging me for days now

@JoesAutoElectric 7 лет назад

MEA? Do I know you?

@vangogle1 Год назад

Love your channel. My go to for everything. Just about to buy a cheap Pico. So your inexperience was really helpful to me believe it or not. I've wstch several vids on Pico's and CAN BUS. Do know a little but this gave me tons of confidence cuz now I know that there's not a ton out there I didn't know. Your a genius and you didn't know too much about CANBUS. So I don't feel so dumb😄 Wish you'd put out the vid of installing engine in this Van cuz my daughter has one and I want to keep it running as long as possible. Seeing vid may determine whether I put an engine in somewhere down the road if needed. Btw, I'm sure by now yiu are a CANBUS expert. 6 yrs can add a lot😄 Keep up the great vids.

@northsouth9079 7 лет назад

I hope I can work for someone like you and the kind of business you have after i graduate school.love your videos keep up the great work.

@tuffbarber842 7 лет назад

good job of explaining SMO.I actually can say I have learned a lot this one thanks Eric.

@PaulysAuto 5 лет назад

Finding a wiring diagram for the whole thing is a process, I just ran into this type of problem today...AGAIN...I did fix it, but that's why I'm here, to LEARN STUFF. Watching your approach Eric and very curious to see how you attack um🤣🤣🤣👍 Ok back to watching now.

@burn153 7 лет назад

I had to do a similar repair on a 2009 Dodge Ram. Nice video!!

@darrenberry3456 Год назад

Great Diagnosis and repair .

@Bobbywolf64 5 лет назад

My buddies grand caravan has the exact same issue, like to a "T" I'd bet money when I dig into it I'll find one or both of the same wires broken. SMA for the win!

@mouhajirmohamed751 3 года назад

Amazin work smart man thx my town and country driver door is heading down to that problem I’ll try to fix it before it’s worse thank you so much

@williegillie5712 5 лет назад

Good thing you learned the CAN systems of vehicles. If you CAN learn learn it so can we.

@63256325N 5 лет назад

Nice fix. I was ready to throw a switch at it, I would've been wrong. Absolutely not the first time. Thanks for the video.

@workingshlub8861 7 лет назад

just bought a cheap harbor freight scope on a rope.. that thing is so handy. good job eric

@macktruck2007ify 3 года назад

Hey thanks for doing the Town & country's I own one it gives me a reference just in case I had the same problems

@harrie6124 7 лет назад

great video Eric we learn as we repair

@thomvogan3397 3 года назад

Always nice to see Hannah

@yhird 4 года назад

Awesome video. Thanks Eric.

@Antto 7 лет назад

Well done Eric, nice fix. Keep up the good work!

@DaveSender66 7 лет назад

Thank you for sharing your knowledge with us !!!!

@johnniec2861 2 года назад

magnetic Roach clips,, LOL sweet :P , Great Job you always hit the technicals that other people wont,, Thanks

@jpol3808 5 лет назад

Hey Eric. The only thing you screwed up on. After you soldered the splices and put on the clear heat shrink tubing and even though it had inside adhesive, I just can't believe you forgot to seal the ends of those heat shrinks, with the clear liquid electrical tape! What a rookie mistake. Hey, all kidding aside, your honest and good and that's why I love your videos. We don't make mistakes, we make LEARNING EXPERIENCES! Jpol.

@mdorf61 3 года назад

im currently watching this at 9:32, im going to say you need a new door switch module. cat wait to see how this turns out. WOW, I was wrong. Awesome Video!

@joemilton7552 7 лет назад

Awesome job, I loved everything about this vid. Keep it up!

@airborne63 4 года назад

Not the first time I've seen the 'door flex' broken wire prob.....had them in Crown Vics before....whatta pain! Good one!

@jbborg Год назад

I would choose you on a day where you really are not sure what you are doing verses the mechanic at the dealer. At least you are honest and admit your weakness and work from there. Instead of throwing the parts cannon at the problem and maybe getting the correct result. You inspire me and I dont even work on cars, except my own. Blessings to you and yours.

@aubreystanley1124 4 года назад

I admire your courage.

@djbobbyd3985 4 года назад

I got to say that was a Great video.... I learnt a lot. Excellent job on your troubleshooting skills

@PineHollowAutoDiagnostics 7 лет назад

Great job Dr. O! As you have demonstrated, an oscilloscope and a known-good waveform is the only sure-fire way to diagnose a high-speed network. Looks like the Autel scope was shining in this application :)

@tctwg1 5 лет назад

Pine Hollow Auto Diagnostics 🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕🖕🤬🖕🖕🖕🖕🖕

@JosePerez-bz4ix 7 лет назад

great repair Eric keep it up love your videos

@davegair1984 3 года назад

Hi Mr O I was always taught to clean the soldier joint of the flux before sealing up

@samd410 7 лет назад

excellent work as usual.... thanks Eric O.

@scottcarper1401 Год назад

Over the years of also being a tech I’ve run across so many broken wires in the door harness it’s one of my 2nd checks after testing the switch and. Module it’s such a common due to those wires constantly breaking

@georgeshadrick8860 6 лет назад

Keep it up Eric oh you're the best in the business by far

@feeneysmechanical6215 7 лет назад

Morning Eric, Don't worry I am still learning about Can bus diagnostics myself. But I do have a idea for a upcoming video. How about a quick say ten minute video on all your scan tools. Pro and cons. I am the same way as you I like to be universal on scan Equipment. Keeps the mind active.

@svengonzales2664 7 лет назад

Great video Eric. Just remember Eric it's still about the wires and what they are attached to. If the wires and connections are good then a device is bad.

@SouthMainAuto 7 лет назад

and in this case the wires were bad

@TheDaf95xf 5 лет назад

Hi Eric O love your terminology on things..........😆 Like the money lights on and someone has been here before haha 😂 Thanks for making me laugh Stevie 👍🏻🇬🇧

@shadowdog500 7 лет назад

Good video. I didn't even know the new cars used a network to control stuff so I really learned something. I wonder how many years until the network becomes wireless in the cars and there are little WIFI like transmitters and receivers incorporated in each component. Chris

@brandondavis9687 7 лет назад

newer cars already communicate wirelessly on some circuits, like tpms reading tire pressures..

@cent31119 7 лет назад

I have come across this many times on these vans and I always just replace the whole door wiring harness for peace of mind. The harness is cheaper then you think and the "SealerShip" can get it within a day if there not in stock.

@SouthMainAuto 7 лет назад

Well a bit of solder and a piece of wire is pretty cheap on an old van like this :)

@randomcrap763 7 лет назад

Is James serious? I've learned tons watching this, "Couple thousand dollars in tools?" Um if you are a pro and doing it day in and day out but last I checked a Scope on a Rope is still pretty inexpensive, as for the rest....well as cars get more and more complicated you will need some more complicated tools, that's not Eric's fault. Keep up the vids amigo, we are LOVING them!!

@daveyio87 7 лет назад

Great video. Say you don't have a scope you could use a multi-meter that records min max values and check the network that way, It wouldn't show you as much detail but it still works. Good luck on your class learning about networks! One network that GM has out now that can get very confusing diagnosing is the MOST network for infotainment systems...