Buick LaCrosse: No Start No Communication

what a lovely day to work on a chevrolet or a buick a buick rossi cxl the wind is down what year is it it's co5 apparently it does not start oh we got a little stinker bell down there and i did come out she got a buck 36 on it i tried to start it and it doesn't do anything let's see keon holding it in the crank position nothing no [Applause] and that's it now apparently this is very intermittent i'm hesitant to even pull it inside so we need to figure out what we can do from here just with what we have it's interesting do we see a check engine light i don't got the battery the coolant let me give it a second here that's interesting the keys out of it open and close the door we have an engine light i don't see a check engine light so that's peculiar [Applause] i don't know if the key yeah the key fob doesn't work you told me that honestly i don't think it's got anything to do with it but yeah obviously no check engine light let's get a scan tool first and foremost and see if we can learn a couple things so i tried to let this one do a auto id and it wouldn't uh not surprise there so i'm gonna go through put it in manually it's terrible clear outside here but you're gonna have to deal with it i'll put it in manually we'll let it auto scan and see if any of the modules are talking i'm thinking we've got a failure to communicate here uh probably due to you know lack of power more than anything it's my guess if i had to take a big fat guess what was this thing a rossi oh not an allure in canada yeah what engine do you think we've got we'll go with the three six um i think we have a failure to communicate and like i say probably from lack of power whether it's ignition switch or a relay or something that's not turning on powering up the pcm so i'm going to let this do a scan here and then we'll come back and see who's talking who's not and go from there well the good news is so far there's not a module without codes in it let's see where we're at here it's just about done and we're going to go to the report everybody's unhappy at this point and let's see there is 18 systems a number of 34 faults 34 fault codes everything's got codes in it class 2 data link malfunction device ignition 1 circuit engine electrical that's interesting okay device voltage malfunction lost come with ecm less common vcm lost common abs class 2 data link cast 2 class 2 class 2 class 2 device ignition 1 circuit this is kind of what i'm more concerned with than anything else who's what module is this this is the hvac does the hvac work here fella there's two okay so that we know it turns on voltage malfunction device ignition one circuit device voltage malfunction that's in the shift interlock does the shift interlock work there fella okay that does and it locks class two so we've got a bunch of stuff and a lot of everybody's uh flipping the bird here at this device ignition one circuit however he did tell me that this thing was at another shop and then they told him to come here [Music] so i don't know how much people were fiddling with stuff he says that they were jumping relays and jumping the starter and everything i'm gonna save this and then i'm gonna rescan it and see what we have from there i think that's our best option now that we have a little bit of direction i will say so clear the coats i just want to try something here still no money light i'm going to try to flick the key kind of hard sometimes sometimes that'll do them on these chevys if remember the chevy blazer we had we had a judo chop remember that one give her a good whack i'm gonna let it go through uh so this is after we cleared it uh still the ignition one circuit like i said i think that's where we're gonna find some our biggest issues i want to go through and rerun it now that we've done a couple key cycles so real quick here in the body module if i shut the key off it is inactive that's accessory that's the run position where it becomes active and then if i hold it in the start position it does say cranking so it is seeing those inputs uh so at least we know that so let's see we want report we'll skip that we'll just check here probably a bunch of class 2 u1 thousands all right engine electro u1000 u1000 uh transaction control module not happy with anybody can't talk um torque malfunction that's because they can't see any data from the engine controller and then some bunch of u1000s okay let's come with ecm obviously it's interesting that it can't talk to the body module or the abs so i think we need to just keep it simple and we need to figure out why um why this ecm why the engine controller is not talking to anybody i think they're pretty easy to get to on these cars so i would just get a diagram powers and grounds i think we're gonna we're gonna find our answer or maybe visual inspection we'll find a giant mouse nest i don't know but that's the route i'm gonna go because it looks like everybody else talks and everybody else is happy except this little guy so let's find out what we're missing power ground whatever it is and then just trace it back from there i think that's the best that's the best at least that's what we're doing because you don't have a choice can you see that got your classic wires uh [Music] is everything melted there on the oil filter i don't know is that the engine computer i don't know that either i think it i think it lives in this box down here which looks like somebody kind of hasn't had to touch too much stuff it's giving her the old visual once over it's got the big three six case we haven't mentioned that that concerns me a little right there we can see some light on that subject that's concerning we're not going to touch that right now it's got the new alternator is that for the is this a transmission control module here or something maybe not sure don't know don't care somebody's been fiddling with wires there they've been fiddling with wires there uh pretty sure she ain't no virgin baby it's so quiet let's get some stuff we need a seven and an eight and a thirteen and we'll take this little guy with us that should get us into the box let me get a diagram [Music] anything print for me young lady something princeton it's so stinking nice out today it's like almost 65 sunny we're gonna peel this off somebody's somebody's been here folks i see these bolts have been touched these don't come out that easy not in the prny so we're gonna leave that right there we'll stick these right here [Music] i don't remember if these are seven or eight they ain't seven so that means they're eight we're going to have a little look-see i did get us some diagrams that that was loose come on baby so you want to be huh don't worry i brought my little i'll get that screwdriver done that's loosey-goosey [Music] oh he's got some oil up in there oh lots of oil i didn't want to get messy little girl needs a catch can what the thunder that's not the engine computer i'm going for the wrong thing ding dong it must be up here what is this a trainee down here i wonder somebody been in here because they did what i did they didn't look i don't have near enough wires on it i don't feel it needs an oil air filter though almost like an oil filter at this point well there so there you see my my my faults my fallacies my failures i guess they will be tore that apart like a ding dong i'll stick her back together what's up this is though you need to talk to me what's going on you can't see it it's super so what's up we want to talk to him yeah he's coming out to soak up some sun oh i know oh it's so lovely a little bit warmer i was wondering if you want to eat lunch yeah isn't it only like 11 o'clock no no it's 11 30. yeah it's 5 30. we can do that [Music] there's got to be an ulterior motive behind wanting to eat lunch early and uh you know here's a guy who spent thousands of dollars on service data that doesn't use it uh it says right here engine control module top of engine here we are fella okay she's got some fresh tape on her too awesome so i had a glance here it looks like connector a c2 5050 chance who's c2 uh appears to house the voltage of one two three at least three voltages uh don't see any grounds though which is peculiar i do see it has a case ground and i did see that on diagram one it showed [Music] i think if i go back to the beginning here where i should have started uh it does show a case ground but there has to be other grounds than that i would assume i could be wrong i didn't even know where the thing was right i can't trust this guy anymore uh maybe that's it fella maybe that's the only ground on the whole getting kabue here so let's grab us a little power source right here off the alternator you just stand by not going to move you might not even be recording for all i know our test lane is good it lights up up here but that's a pretty small amount um i'm gonna take a quick key on here folks we are still currently in a no start condition [Music] okay let's just check this ground here get a good hook down here on the positive side just don't want to short anything else now short anything out down here okay so my test light does work it does work there [Music] things are kind of crusty it does work there okay so let's find connector c2 i'll have to scrutinize this with my old man glasses to see if i'm missing some other grounds but that seems kind of weird of course i don't ever remember working on a ecm that looks like this either we're gonna see if this is number two we probably could go look it up and tell you what let me just pull back this rubber and see who's got all the pink wires because i think the pink were all our power wires yeah it looks like we got a bunch of pinkies i don't see pink on that one and of course i don't really see many pinks yeah i got a pink over here got a couple pink so maybe this is connector c2 [Music] i don't see any pinks on this one so we'll fix that in a minute here let's kind of screw around with this one here i don't really want to unplug it i just want to get the lid off it but we have to open the latch here a little bit to do so i believe so because we just want to get the cover off so we can just back probe it well it's in place [Music] that makes sense to you so there's that we will take and latch it back down i'm gonna set this to the side cannot even tell if you guys are in frame let me see you guys are right about here so we should be good and let's see what the survey says [Music] wrong page wrong page reminds me of jimmy page getting the let out just listen that yesterday a little stairway to heaven perhaps the greatest rock and roll song of all times [Music] so we got pin one and three we got one is pink number two black with white number three pink okay yeah so we're on the right page here because it looks like uh there's a pink and a black with white and a pink so that has to be one two and three let's get us a good ground i'm gonna ground right off the alternator bracket here actually we got a battery right under the hood here's the guy that's going for the alternator bracket wait till today's monday right my guy okay did i just say my guy where's my we got a prober up here my guy that's what you that's what you say when you've been playing fortnite too long with eight-year-olds okay so we're gonna back probe the pink hopefully we got power on that one they all come from the same source i would think they would all have power try to slide down beside this one here far in okay so i just want to see how far in that was so pin three we have power on pin one is what i'm trying to get into pin one we have power on like i said they all can't come from the same so and then um pin 17 should also be a power source which is also pink is that right my god let's see one through seventeen gotta quit saying my guy i play i i gotta quit it so that's one two three four five six seven eight nine ten eleven twelve thirteen fourteen fifteen sixteen oh it's gotta be right next to it up here on the top side yes sir there she is there's another pink one come on this is our ignition one voltage this one should also be hot all right we have power there what's up miss though we got a question all right stand by okay so we have power there power there power there so we got power on pin one pin three and seventeen there must be a full time battery here okay pin number 36 which is orange we gotta find that because i can't read my numbers here uh but if we know they go [Music] so that is what do they go up to 16 16 is 32. what number is that orange is 36. oh she's gonna be buried in there a little bit deep okay so we found pin 36 which should be a full-time battery power [Music] and we do have a light there you guys probably can't see it but we do have a light so what does that tell me she's starting to look like we got a bad computer power power power battery power um i think that's it fellas [Music] i think that is it and then it has a gm land bus that runs to the transmission control module and then we have our class 2 data bus which i think is the only way that this thing talks i do not believe this is can enabled we're going to verify that for sure whoa fella not using this working outside in the field stuff [Music] let's go back to page one go back to where it all began [Music] i do not see a ground other than the entire case ground a lot of low reference wires coming out you know grounds going to various sensors but that's it so i think what we need to do is verify the class 2 data bus is making it here and then make the call so the class 2 data bus dark green dark green uh what number is it 48.49 so we gotta be in the last row so it's gotta be this one here that's 48 because then 49 is green with white and that goes to something else that goes to the uh some kind of relay control so 48 and then you got a bunch of blankies right yeah no we're good folks uh let me go get a scope and we're gonna see if we have class two data communication here so class two uh on a chevy should be like a zero to seven volts i believe uh you know computer talk stuff so let's go uh get a little scope here before we get a scope i'm gonna go here because i think oops what did that just say i don't know we need to do pin two let's see what is that j 1850 is j 1850 i believe is pin two and i believe that's [Music] that's not doing anything maybe is it pin seven i feel like a ding dong because nothing's happening right now right let's hit play uh oh exit diagnosing before using this function okay let's see so let's exit out of here i think it's pin two i think class two is pin two am i right correct me if i'm wrong i'm sure it will now i just did it wrong again god this guy is click happy now because i i get too click happy here let's see searching for devices i think it's because i clicked on the scope so here we are so pin two and we are looking [Music] uh at zero to seven volts right where is that at that is at about 7 volts so 7.12 volt so this is what's going on the class 2 data bus as we speak we can change the time that's trigger don't use this scope a lot bear with me there's our time interval let's put some more time on the screen so you can see all the gibberish so here we are these are all little individual data packets um running on our class two data bus so technically we should see the same thing at our pcm so this is what's at the data link connector which we knew that wasn't down simply because everything else is talking so where's this trigger put a trigger up here get her to hold still for you hold still little fella there we go so that's that's that that's what we're looking for the zero to seven bolt computer x's and o's and ones and zeros and abc's okay that's what we're looking for now we can go uh we can get us the scope and get a little scope lead for this and see do we have that at the computer i think what we'll do i'm gonna clamp the ground right on the battery which they have shimmed up with some cotter keys it looks like uh i'll make sure i got a good ground here story of my life then we're going to take i've got to just hook to the alt telescope because why not you guys know what it looks like on that we're going to back probe the green wire here i think it was 49 if i remember correctly it feels like it's in as far as it goes let me just double check it over here on this side yeah it feels like we should be touching something let's go have a look hold right on there folks i think let's bring it right with me okay so we're still right here um this recording outside stuff sucks so we're still on uh pin two down here so we wanna back out of this we wanna stop it yes we want to exit try not to get click happy we want to go to scope [Music] let's go okay here we go let's see we should be on channel a right is that what i plugged it into a whoa hey let's go 50 milliseconds per division and our voltage where do we change voltage at here maybe in here we want to go to 10 volts oh calling a medic we're flatlining let me take it out here little with our connector okay key is on so i make darn too and that we're in the right one here [Music] oh it's i saw something there we go now we got her back probed that is not as near as much chatter as what we were seeing [Music] at the data link connector i'm pretty near certain oh you know why because the key's off my guy let me turn the key on keys on oh there we got some jibber jabber and we are running zero to seven volts am i right we are zero to seven volts so that's good and then now if we change the time basis here this should be that all familiar site that you guys are looking for will bring up a trigger bada bing bada boom so we have powers we have grounds and we also have the ability to communicate that's what that's why i tell mrs oh i have the ability to communicate sometimes i just don't do it correctly so that's good um it would be nice you know it would be nice if we could go here and we could go here and look at them both at the same time but i don't think this lets us look at the dlc plus because that's where it can burn you sometimes okay do we have high speed we got 6 and 14. really [Music] can't i can low no high speed can so we do have a high speed can let me double check my wearing diagrams here jamaican watermelon homemade watermelon making watermelon all right and i made you i guess that's kind of boiling some rabbit food i am going to feed you some chicken though oh thanks let's see here folks so 6 and 14 it does have so it does have a high speed data network that what runs the transmission control module only so that's good to know uh pin number two is what we're looking at is purple that comes down here into a comb now that you use on your hair but uh that distributes all the different wires and you can see that class ii talks all these different modules and then in the pcm it also has a uart serial data primary in a uart serial data secondary and fun fact the u codes on cars come from that terminal determine this gosh dang it tried to give you a fun fact from you are universal something something something i don't remember what they're acting in for but that's why we get a u code that's what view code's for uart and uh anyhow so you got me all distracted you don't even hear me do you what no you got your earbuds in yes oh my goodness oh you poor little prius look at that little a little more exploded in the back of that thing what a crappy video uh universal asynchronous asynchronous how they say that receive and transmit yeah right i don't know whatever dude it doesn't matter it's trying to give you a fun fact i can't remember acronyms i can hardly remember anything else i believe that we have a bad pcm i don't know of anything on a gm that will make it stop communicating you know like a let's say like a chrysler that has you know the five volt references pulled down and it just puts the kibosh to everything this appears that we have powers we have grounds and we have the ability to communicate therefore it should work i don't know of anything else is this kind of old primitive type system and i believe that we have a bad computer that is my thoughts the funny thing is is that he says it will run if you jumper the solenoid is at least that's what he was told uh by the other shop um and the thing is the fella drove it here and says he has had problem in in quite some time he made his appointment weeks ago and then you know it hasn't had a problem since and it's been driving it it's his daily i'm going to look at some oem diagrams i want to make sure that i'm not missing anything and then i'm just going to make the call and say it needs the magic box under the hood that does all the magical stuff i don't know what else to say seems to be as simple as that [Music] let's grab our where tools check plus for the mechanic with the on-the-go lifestyle that we got a 10 in there we got a 10 a little extension little ratchet i think that's what we'll need most importantly it's got a little belt clip boom look at that huh boom boom boom we'll tell the very lovely misses i'll just say some lunch we'll be back young lady okay love ya yeah all right let's rock and roll it's thunder time sick new tires on a tundra all right all right folks we're on the way to the wilbert's you pulled a bath in the tundra uh i've got us a list in my pocket of what this thing fits the guy the wilbert says he can't tell me what it fits for some reason he couldn't cross-reference a pcm so i did it myself looks like some lacrosse builds across obviously the rendezvous and uh a couple cadillac models srx cts 0407-ish somewhere in there i think they had an 07 lacrosse so we're going to go right for that right out of the gate we've got our where a kit and uh and that's it we're almost there they're pretty close to our shop so it amazes me like how busy this place will be during the middle of the day in the middle of the week uh let's see we got one tts we got a rendezvous and a lacrosse row 24. that's what we're in here i've seen a maroon rendezvous let's go see if that's it uh row 2405 what year is this one oh this is a 05 then digit 5. this is it baby let's make sure i tell you what it's got a little tag on it here oh five rendezvous 8260 8260. let's see if it's got a motor it's got a big old dent boom it's got a motor where the thunder is a computer it's probably in the box we didn't bring stuff to take that apart maybe it's not even the same for a three-four all right let's go find let's go to row one let's go find a lacrosse because i only brought my wear a kid baby row three who is that our cts let's see sorry let's put the shuffle in here uh 85 22 85 22. this is this is our little guy here sun very biscuit took it jerk holes now we gotta go to row one and what are we looking for here one hold on row one we were looking for the 2007 buick number 8123 let's find a lacrosse nope nope oh this is it baby i see a computer 07 lacrosse 07 lacrosse well let's just take this one right seems legit let's see if we can do it with what we have to work with here which should not be the problem wiggle that one off that's one thing we didn't do when we left the shop is it we never did a visual inspection on a connector now here's a guy who's making some big assumptions [Music] and i didn't bring the wire cutters so we could take these harness connectors but we know where they're at if we need them hopefully ours does not need them but we'll stick them on the side very gingerly in case we need to come back [Applause] to cya that means cover your butt we're gonna undo this that way and then this way and then oh 10 millimeter too imagine that i'll tell you this where a kit gets me more parts from the salvage yard than any other tool i have not that's probably not true that's a false statement you guys probably don't need to watch me change this to you let's find out if you do your weirdos we probably should have got the numbers off our other controller but i think the hardware is all the same spider each classic seven mil not eight that's for the ground wire come by can't do it we'll disconnect the ground somebody in the comment section wants to know why we tested the ground with our low amp test light 750 milliamps and we were satisfied with our results i'll tell you why is because we did it with the key on we did it at the point of failure okay if that ground was bad our light would not have lit up if it had such a bad ground that it wouldn't turn the pcm on does that make sense like sometimes you can test the ground with no current flow through it and it will uh it'll light up the tesla until you load the circuit in which it supplies that's it man look at that little guy you guys can't see me it's all black i know but it's funny the people that look at me like i'm the funny guy who's this nut job talking to himself all right let's flush this toilet got mobbed by the fans by that i mean i seen a guy who watched my channel i like to make it sound more important than it is uh a grocery store last night with mrs though that's what you do on a date on mother's day you go shopping for groceries and i met a fan there too in the wegmans wigman's a corny he was super excited i'm super excited because we just bought a pcm for the price of a pack of cigarettes and uh i don't smoke but i see they're expensive there in the store so let's roll time is it almost one o'clock this is a pretty tiny little computer what's happening what are you doing were you sleeping i wanted to sleep you ready to go do work sorry i had to go do work though okay i believe the key is off still hopefully these suckers are clean rookie mistake if they're not clean as a whistle we got lucky that's our 7 mil for the ground i guess that's the only one we really need at this moment in time because we can just plug it in make sure we made the right educated guess i'm sure we did very gingerly put that on there now it's not going to start and run folks don't get me wrong but we should have the ability to communicate at this point and it should be flipping us the bird saying hey security we need to get security that's what it should be telling us let's go find out for right or wrong [Music] keon hey we got an engine light now starting disabled so that's new and that's fun [Music] and this is where we left this thing [Music] so we want to come back into try agnostics uh we want to go to our history with my screen all flickery maybe because it's really hot let this thing kind of boot up and then we want to go right to ecm engine control and then we want to go to trouble codes which should have some theft deterrent stuff [Music] i'm thinking current codes theft deterrent start enable signal not correct so anyhow we were right we should be able to go read live data now [Music] that we can read all the data so we're good we're happy let's get this thing programmed so we'll take this thing out now that we know it's junk well we knew that before we just we're in a hurry there's that one we're now using the gm mdi2 i'm letting that get connected so hopefully we can go through and program this without a hitch i'm hoping gm's been a little finicky here the past few days some reason this thing is like dragging its feet so i'm gonna give it some time here folks but i mean it seems to be working but it is going abnormally slow like we just got the counter up there uh usually these things go through pretty zippy zap i did kind of throw a fit we had to do an override uh for because it did detect the vin that's in it uh but it looks like we've got some progress now it's just the hurry up and wait game um i may not be able to finish this before i have to leave this is just like reality tv it's 128 can we do it this is the end finally made it to the end i think things are getting a little heated up out here okay hoorah and we have the right vin now we should have awesome see this is where it's like uh a new vci device was connected reporting this vin that's that's really interesting that it brings up the old mumbo jumbo interesting did it really write the bin to it i think we're gonna have a problem all right yeehaw there's one not problem but we got a lot of lights on i don't think it wrote the vent um because when i went back in and let it re-id it pulled up the 07 bin so let's go quick like a bunny rabbit and get a scan tool i think we're in trouble well she does auto id'd and it brought up the correct bin uh that should be us so let's see i didn't clear the codes after the programming so it's likely we've got a ton of communication codes from doing the programming so i'm going to let this go through yeah it did bring up the right thing that's weird that's the first time i've done a used controller with tecline connect so uh oh five yeah probably just get past their o5 buick um i'm gonna let it go through and scan here which of course now we should be able to see the ecm but we're gonna have a bunch of codes from programming so i'm gonna go through and clear them out and if that resolves our issues hallelujah because we got 10 minutes to spare folks we got time to screw off never been on such a tight time constraining my life this guy's got some issues under here still let me tell you what this video is terrible as far as glare let me tell you okay all right no money like now we don't have any history on this car so i'm gonna have to call the guy because perhaps his abs light has been on that's what we'll find out because let's see what code is in that it's scanning the ecm and the electronic brake that's weird let's see what this says just a minute miss so we're on a time crunch rough road center circuit son of a freaking freaking monkey son of a monkey son of a monkey dang it mrs oh i gotta get a hold of this guy we gotta see if this was a problem before i'm not familiar with the po318 hopefully this is not some stinking cadillac problem no we didn't take this we didn't take this computer off the cadillac did we we looked at a cadillac we're gonna have a light now right that's the second trip nope maybe she's not a two-tripper okay it's time for me to go isn't it it's close i told the people if we didn't get this done before two o'clock we could lose everything everything yeah it's like really tv um we gotta call this guy wow because we gotta find out and you gotta call it well we gotta call this fella that owns this thing to see if he had a problem with his right rear speed sensor circuit and this po318 i'm not familiar with that we're gonna have to look this up this video isn't over that's the problem but whatever that po 318 is it doesn't light a light which is nice am i right i'm all right you're always right that's what i've learned to tell you though well we just keep saying it to each other boom problem solved you should be a marital counselor just disagree sometimes i agree to disagree yep rough road sensor circuit don't know what that is um dang it folks i gotta go i gotta go you gotta go uh good news though let me roll up my windows uh the good news is i called the customer uh and without leading them because after a while dealing with the gp the general public you learn hey look at that it's a wilbert's truck you pull out a bath uh that's not that you pull the bath that's they pull it for you and drop it off of your shop truck uh anyhow calling the customer and like i say after learning to talk with the gp you never lead them into the answer that they want to give you um [Music] i can go more into that at a later date at any rate i did call the customer inform them that i believe that the pcm is at fault because i did not get prior approval to repair it if you can imagine that uh and then i asked them prior to replacing the computer did you have any other problems were there any other lights on and at that point the bean can got kicked over they spilled the beans says all the traction lights on the abs lights on every light and the dash is on that's a song in case you didn't know um so anyhow he told me everything every light's been on uh his problem is not having a camera holder on his dash and his problem is look both ways stop look and listen uh he said that all his lights are on the main concern is to get the flipping thing running uh without having communications with the old pcm who knows but i am still gonna look up that po 318 it was and just see what's up with that it's clear looking at the engine somebody's been in there with these fellas the fiddling and things they'll not be fiddling in and uh so anyhow so i'm gonna end the video here it starts and runs and drives it's what he wants i'm running late as a mother lover and i'll see if he wants to proceed with diagnosing anything else with the abs however if i look and see the po318 which doesn't seem to turn the engine light on has anything to do with anything that we did i'll come and get you and we'll go at it on the car so that's a whole lot to say like all the lights are on folks comment section the questions the comments the concerns wish a chevy would find his throttle pedal that's in front of us the insti the facebook and uh that's it folks just from our viewers if i can do it you can do it thanks for watching [Music]

Channel: South Main Auto Repair LLC

Views: 598,128

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Id: NFgQ4APDh0M

Length: 49min 22sec (2962 seconds)

Published: Wed May 11 2022