several things can help us to troubleshoot your issues. start with the year and trim package. next, do you have warranty still? i'm assuming you have a 9th gen (2014+) due to the backup camera statement and detection systems mentioned.

stop by the introductions section and tell us about yourself and your ride. please provide pictures if you do make an introduction, the tapatalk app makes it pretty easy to do so from a smart phone/tablet.

 

Apologies, I've got a 2015 Impala 2LTZ 3.6L I'm out of warranty as far as i know at ~65000 miles. As an update, i've now broken down my entire dash to get behind the radio and mess with the cords to see if something was loose. no such luck. From what i've been reading, my issue sounds like a possible BCM malfunction? i hear that excessive vibration can ruin them, and i've just recently moved to a home on a dirt road. i'll head over to the introduction section now and get that filled out.

 

I'm about to head up to the store and pick up a couple of fuses. It looks like engine block fuse 62 controls my sensors, and 4/5 control the radio and display respectively

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Did you check the amp connections? I am assuming yours have the amp in the trunk as well as mine. My sound went out once and I pressed in the connectors and it came back on. Worth a try to see if it fixes your issue.


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I did not. I actually still have sound, and as far as I know, all functionality of the radio minus the touch display

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ive just finished replacing a few fuses, and it didnt change. i replaced fuse #62 in the engine compartment (rear camera/park assist/side blind spot alert) which was blown, but i still got the errors upon reconnecting the battery negative. i also replaced 2 fuses in the instrument panel on the driver side #4 (radio) which wasnt blown, but had some dark spots near the base on the metal, and #5 (display) which i was hoping to be the issue, which also had darkening near the base. neither of these fixed my issue, which would make me suspect whatever part could have made the fuse in the engine compartment blow, which if im not mistaken brings me back to the BCM?

 

One clue you have here is that the side blind spot alert fuse was blown. Both side object sensor modules/radars use low speed GM Lan to communicate as well as over 12 different modules in your car and some of them are the radio, the info display, amp, BCM, HVAC, etc. It's pissiable that the side blind zone alert modules are corroded internally and/or the wire harness connectors are corroded/Have water in them and are shorting out the low speed GM Lan. One thing you can check is look inside the rear facia just behind the rear wheels and check both modules for expanding in their brackets and water/corrosion in the wire harness connectors at the modules. The modules should be able to move easily out of there brackets.
The right side module communicates threw the left hand side module. If there is an issue with one of the modules and it is causing your issues you can unplug the left hand side detection module, this will take both modules out of the circuit, and see if things come back.
If unplugging the side blind alert modules doesn't help then you'll have to bite the bullet and take your vehicle into your GM dealer for a better diagnosis.

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Any new ideas on this one? Now my radio doesnt connect to my phone, and all that I listen to is pandora. What could cause all of my sensors plus the touch screen display to fail?

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i've heard of their being firmware updates on the newer radios. wonder if you're due for one from the dealer? maybe a TSB or silent recall on it?

 

Just for giggles, see what it would cost at the dealership to have it checked out. It maybe something they know of and can fix cheaply. Unfortunatly I don't think that will be the case. but its worth finding out what they say at least. You may need a new touch screen replaced.

one last thing to check out. Check out the brain box and try to pull it out, unplug and replug the wires. its located far right passenger side way up under the dash, you'll have to flip upside down on your back to access it. I'll see if i can send a photo. I upgraded mine to do gps on screen and to do so i had to swap out that brain box. ($1000 upgrade) but my assumption is that could be the issue maybe that brain box perhaps.

Does your screen still scroll up when you hit the button under it?? if not you may not have power to the screen and

On a side note. The vibration claim i think is false. My stereo in my car is so intense it shakes the cabinets in the house from curbside, so I don't think they are 'prone to vibration issues' well at least mine anyways.

 

I've already broken down the dash and checked the connections behind the stereo. Everything is hooked up, and I still have power. The screen moves up and down, and the radio still plays over aux. Let me know about that "Brain box"

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this video is a walkthrough on how to upgrade it. I know thats now what you're doing here but it shows where the box is located and how to access it

 

if that still doesnt work, you can get a used mylink screen on ebay for around $200 that probably will be the fix you need (for reference, new the screens are over $1400)

https://www.ebay.com/i/173151064215?chn=ps

 

Well, it's no longer in theft mode... I, on a whim, auto started it, to see if I could get the heat working a bit for my drive to work, and when I got it , it started back up perfectly. I'm back to my previous issue, with no sensors and no screen. I've still not pulled the left side sensor cable to see if taking it out of the loop will correct the issue since it's been so cold this week. I did find the diagram for how it's fastened to the car, and it should be simple to remove.

In the meantime, a coworker had an obd2 reader, and pulled the stored codes in my car. Looks like a bunch of bcm issues.

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Sorry that unplugging the side detection modules didn't bring things back. In doing some more research there is an HMI, human machine interface, module update that fixes a lot of issues, from blank screens to phone connectivity issues. The update is for HMI module build versions older than gmg2_14.0f105. Press power + menu + home to bring up The version number screen. The TSB is PI1375C. On code U0140 there is a tsb#PIT4730B that has you look for shorts in the high speed GM Lan circuits (2500 & 2501) witch have experienced an intermitent short to ground while going over bumps.

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Sorry that unplugging the side detection modules didn't bring things back. In doing some more research there is an HMI, human machine interface, module update that fixes a lot of issues. The TSB is PI1375C.

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It went back into theft mode, and my gauges were going crazy while I was driving. Human machine interface update sounds a lot like "learn to use your stuff" lol.

https://youtu.be/qLNFzvsOYIk

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Ya this is definitely a dealer bring in issue. Some sort of internal computer messing up/grounded out. Best of luck,

Let us know how it comes about


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Hi, did you ever resolve this issue. My 2014 LT2 has had similar issues with the infotainment system and I've been trying to find a solution.

My 8" MyLink screen died about a year ago. The buttons on the control panel all stopped working, except for the one that puts the screen up and down. My radio and all my steering wheel controls still work. Sounds exactly like your problem, right?

The dealer diagnosed it as the screen being shorted out and said I needed to replace the control panel. They wanted $1100 to do that and I told them no way, mostly because I don't think it's the control panel at all.

I recently bought a working used control panel from the junkyard and swapped it in. Unfortunately the problem persisted. If the control panel was the issue then I should have received a LOCKED screen of some kind until I could have the dealer unlock it by VIN programming it. So it's not the control panel.

So the question is whether or not it's the HMI, and what my options are to diagnose/replace it...

 

So sorry that i didn't see this earlier. My car is actually in the dealership now. They are talking with GM to see if i can get it covered under bumper to bumper. I've got a case open and all that jazz. I described everything to the technicians rep and left the car there Monday. Wednesday night i heard back. They say, " your sensor is shorted out. 1200 to fix, parts + labor. if you want us to look at anything else, pay us more to daignose. " so gm is now in negotiation with the dealership, and i will hear back monday. i'll keep you updated as to how this goes. i have a much deeper issue other than, my "sensors being shorted".

 

I've heard back and my side detection sensors are internally shorted, which is allegedly giving my BCM odd signals, which led to my cluster going nuts. Its been a week since i gave the OK to proceed with radio diagnosis and i've heard nothing back

 

Have you had any more issues? Mine is doing same thing as far as gauges go not the radio display issue.