Turn Signals Not Working Diagnostics (17 GMC Acadia)

Рет қаралды 11,113

10 ай бұрын

In this video you’ll see the Professor go over a diagnostics that Andrew recently did on a 2017 GMC Acadia. The passenger turn signals don’t work on the front or rear. They all went out at the same time. The drivers side and hazards work perfectly. He will go step by step through the test plan and then show you the fix at the end. We hope this helps! Enjoy!
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Пікірлер: 72

@EATSLEEPFARM 10 ай бұрын

This channel is one of the best automotive channels on youtube. Showing the full process is so refreshing to see. Keep it up guys 👍

@AlanBurnham 10 ай бұрын

Maybe it was done off camera but I didn't see any verification that the problem wasn't in the BCM connector before the BCM was called. IMHO, before condemning the BCM, a small amp test light should have been used to confirm a small load could be carried between the front of female terminal in the wiring harness connector and the point where the wiring harness was tapped for the scope. Great methodical diagnosis other than that. Enough detail to understand and enough edited out to make it short enough to stay interesting.

@mikesautomotivediagnostics8080 10 ай бұрын

By hooking your test light to ground, and touching the input pin while watching the input data, it would show active if the BCM was good.

@ThunderbirdRocket 10 ай бұрын

That was awesome ! You have explained everything about this diagnostic process very very well !! And shout-out to the videographer for bringing us excellent footage !!!

@sanagavizharan92 10 ай бұрын

There's a tsb on these where the ac box drain can leak out ontop of the bcm and cause some interesting electrical issues along with green crusties in the connectors

@johnmitchell2741 9 ай бұрын

I believe they should be looked at first before attempting any repairs could save you a lot of grief

@vickenkaragozian2041 10 ай бұрын

The Escope shines always. The body control module should send 12v to both left & right turn signal circuits when turn signals are in neutral position. When you turn the turn signal to left or right the switch will ground the wire. The Escope has bias voltage negative 2.5v. That's awesome, so when you have a the test lead connected to a wire the red light should turn to gray light. The great thing is if you loose connection the voltage will go to minus 2.5v , but if the circuit touches to ground or if you have a short to ground the voltage will go to 0 volts, That's how you can tell if you have a shorted wire or bad connection. Awesome feature from ATS scopes.. Thanks for posting a new video 👍

@calebmohler3082 10 ай бұрын

Great video, I'd have no problem using a test light to B+ and making sure it light when switch is in right position........

@spirokattan3655 10 ай бұрын

Nice diag! Thank you for taking the time to explain diag path. Excellent! Please keep them coming.

@joeydeemendoza 10 ай бұрын

LOVE yalls diagnostics videos you guys are absolute gurus thank u for sharing your knowledge with us!

@DependableAutoTruck 10 ай бұрын

really good video great information wasn't sure which way to go after the scanner didn't show anything. it might have thrown me down a rabbit whole, i probably would have applied ground on the wire for right side at the BCM to see if anything happened. thanks for sharing learn something either different or new every time i watch a video from you thanks again

@martinboucaud679 10 ай бұрын

Great diagnostic my friend. That was awesome. I love it. Thank you for sharing this awesome job.

@personalimpressions4749 10 ай бұрын

Great video on the importance of verifying the problem. Some would’ve replaced the blinker module by looking at scan data.

@agoodneighborautorepair2176 9 ай бұрын

Very nice explanation and information(I think you can test the switch circuit with va low amps LED lamp 12v

@zekzygaming5128 10 ай бұрын

Glad to see that the volume is just fine now, thank you guys.

@mod_incllc3235 10 ай бұрын

Great video! Love that you focus the content mainly for working technicians. There are plenty of DIY focused channels but less professional oriented content on KZfaq. Thanks!

@GUE5TPA55 10 ай бұрын

Very in depth, this is exactly what I was looking for.

@user-ve8mx3zi6k 10 ай бұрын

If I'm thinking correctly, a grounded test light applied to the left input likely wouldn't light due to the small current reference voltage output by the BCM. It seems that it would toggle on that circuit though, which could be used as a diagnostic method for the right side. But, as clearly mentioned, an accurate diagram and understanding of circuit operation is critical. Personally, test lights and power probes and other pointy circuit damaging type tools make me cringe. Keep up the good work, videos are excellent. Al

@jameslewis1175 10 ай бұрын

Man you make it so easy to understand this. Thank you

@James-fs4rn 10 ай бұрын

👍 great work as always! Thanks for sharing.

@robertmobileman8304 10 ай бұрын

great video and explanation of diag process, thanks

@pontiacsrule8761 5 ай бұрын

Great video as usual. I'm a DIY guy. i know that's the way things are today on cars. Imagine explaining to a customer the repair bill for a right turn signal. Long gone are replacing the $2 1156 taillight bulb. People don't realize what goes into all that trouble shooting & programming. Great video as always. I love these videos from Royal right to the point diagnosis. If you guys have a shop, can you estimate what that repair would cost in today's times? Thanks....

@johnmitchell2741 9 ай бұрын

I have an XTool d7 I can light up each individual light on my 2018 Chevy Cruze using the special functions tool on the scanner So that would eliminate the BCM and all the wiring,and connectors from the BCM to the lights. that's a big diagnostic time saver

@Mdavied2023 5 ай бұрын

when you started diagnosing using Scanner, you checked if there was any signal from switch to body module. my question.........why you didn't command on active test the right signal using scanner before using scope? when the control body module didnt see any signal i thought the problem is between switch to the body module i thought the diagnosis procedure using scanner is ..........check signal using switch ........then command active test the actuator or motor to eliminate it. i really love your explanation and and strategy when you diagnosis thanks

@AAB371 10 ай бұрын

Great video and explanation

@Santiago_Ordonez_ 7 ай бұрын

Excellent case, in my opinion the only thing missing was the test of the turn signal actuators.

@ryan.mullen 10 ай бұрын

Such a great video. Thank you for what you do. 🙏.

@michaelt8330 10 ай бұрын

Another great video!

@PaulCTownsend 8 ай бұрын

Great video and info thank you.

@user-zl5jz5fg3f 8 ай бұрын

Great and informative another excellent video well done

@danielrobertharrison7827 5 ай бұрын

You could make up your own 1 2 3 4 and 5 volt test lights

@johnmitchell2741 9 ай бұрын

Somebody in the comments mentioned you should always pull any TSB before starting down the diagnoses rabbit hole.🧐

@IamReadyToRock 9 ай бұрын

nice video . From Peru

@stansmulders6126 10 ай бұрын

Learned some thinks thanks

@clivewright7778 10 ай бұрын

A power probe is a very dangerous tool in the wrong hands . I love the power probe but there should be more warning about pushing that button

@tomerikstokness276 3 ай бұрын

You could also just jump the pins in the plug to the switch ,to check the switch. and Ohm between the switch-plug and BCM..

@mikedavidson2117 10 ай бұрын

Hi may be a led test light would be safe

@philh9238 10 ай бұрын

What caused it to fail? Over current from the turn signals?

@martinarrieta248 10 ай бұрын

Grasias

@aymenmohamed1134 10 ай бұрын

Awesome

@CareyH64 9 ай бұрын

Expensive flasher.😵‍💫

@tnamen1307 7 ай бұрын

Very simple issue. There's no 12V send out from the BCM for the right turn signal switch. That's why the scanner shows -2V.

@overload3996 10 ай бұрын

OTC 3631 PCM safe test light could be used along with a meter.

@johnmitchell2741 9 ай бұрын

Wouldnt a DVM give you the same readings to help diagnose the wiring and connectors if you can't afford to buy a scope.Sorry looks like you answered my question The scope just makes it easier

@DependableAutoTruck 10 ай бұрын

what i would like to understand how doing the turn signals this way is better than the old days when you didn't have a computer such a simple circuit made complicated with electronics.

@AlanBurnham 10 ай бұрын

Well, it is way too difficult to hold the lane change position on the turn stalk; we need a computer to do 3 blinks. I'll take a manual transmission and mechanical turn signal flashers any day but a basic vehicle like that won't sell...blame long term financing for that. Most people wouldn't pay 40k+ for a car if they couldn't finance it for several years.

@DependableAutoTruck 10 ай бұрын

@@AlanBurnham the ford guy that fixes all the late model fords just fixed a F-150 turn signals quit chain reaction soon vehicle would not run $5,600.00. the tail light lens was like $1,600.00 and it didn't have the lane assist module in it that was extra. no reason a lens should cost that much

@AlanBurnham 10 ай бұрын

@@DependableAutoTruck I saw that video as well. Most people that buy those complicated vehicles new will probably never see the crazy repair bills; when the warranty runs out they buy a new vehicle with even more fanciness. I'll admit I wouldn't buy a new vehicle without power windows so I'm probably part of the problem I complain about.

@johnmitchell2741 9 ай бұрын

Ive read the manufacturers are doing it to cut down on the amount of wiring and connectors which also cuts down on weight and if your good with a scanner it can cut down on diagnostic time

@DependableAutoTruck 9 ай бұрын

have you looked at the new vehicles take the 5.3 look how much wiring there is compaired to earlier years mor and more wires@@johnmitchell2741

@ront7795 10 ай бұрын

I do have a question, hopefully I don't offend by asking. Why did you not use the Launch scan tool that you did a piece on about a month ago? I saw you using your Snap on tool. I'm just a DYI guy that likes to fix things when possible myself & am asking for a little reassurance before dropping 400 plus. Thanks for your videos & your time. 👍

@theroyaltyautoservice 10 ай бұрын

One of our shops still use it daily but mainly for pre scanning vehicles when they come in. The one at our other shop locked up and won't turn on. Ive got to get with Launch and see 8f they can fix it.

@ront7795 10 ай бұрын

@theroyaltyautoservice Thank you so much for getting back with me! Means alot, greatly appreciated. 👍✌️

@johnmitchell2741 9 ай бұрын

My friend bought an XTool d7 and I can make it turn each individual light on in my car,so that would eliminate an awful lot of diagnosing time . I liked it but wanted a Bluetooth dongle-type scanner so I bought an XTool A30M I got it on sale for $170 but it will not program keys and you have to use your own Tablet it will also record and give you a health report on all your modules. Just Saying, do your research

@ront7795 9 ай бұрын

@@johnmitchell2741 Good info John. I actually ended up getting the Xtool! Felt it was a little more user friendly & better options for the DIY. Does a ton of stuff.

@johnmitchell2741 9 ай бұрын

Cool glad I could help@@ront7795

@davidbarnes9184 21 күн бұрын

I appreciate your video but man brother..I'm not that far advance..just need to fix it

@marshall1157 5 ай бұрын

i miss the simple flasher type turn signals

@johnmitchell2741 9 ай бұрын

Im just curious Did it have LED Lights or incandescent bulbs

@TB-jy5nr 10 ай бұрын

Hoi you all nice video Can you open the bodcontolmodul?

@johnmitchell2741 9 ай бұрын

I would have tried the 4 ways just for the hell of it to see what happened

@TucoolRacing 10 ай бұрын

Hello, may we know how can we send products to you for testing? Thanks.

@theroyaltyautoservice 10 ай бұрын

You can reach us through Facebook Messenger. Royalty Auto Service St Marys GA.

@michaelt8330 10 ай бұрын

How did you determine that it was UHF?

@theroyaltyautoservice 10 ай бұрын

It's been a couple of weeks but I believe that information was in the RPO codes.

@tomd5010 10 ай бұрын

Yet another reason I’d never buy a GM vehicle. A simple turn signal not working ends up costing for a diagnosis, a new electronic module, installation and programming. Got to be hundreds of dollars. No reason it needs to be that complicated, although the video was informative. A turn signal should need power, ground, switch and bulb. There are a zillion of old vehicles driving around with the good old setup working just fine.

@ua7pyro591 10 ай бұрын

Typical gmc quality, surprised the owner even noticed they don't work!

@tnamen1307 7 ай бұрын

If it's was my vehicle, i would have simply buy electronic relay parts, and rewired with the BCM to actually work for both left and turn signals. Only 10 dollars will FIXED the issue.

@matpolson4411 10 ай бұрын

My only question is what made the bcm fail in the first place?

@theroyaltyautoservice 10 ай бұрын

Unfortunately we don't know.

@johnmitchell2741 9 ай бұрын

Someone said in the comments there was a TSB on this issue saying water from the ac evaporator drain was dripping on the connector causing it to corrode @@theroyaltyautoservice