Think my HMI is bad

[mateyjoe]

Hey New guy here. joined because im having some issues with my radio

my wife has a 2016 Tahoe LTZ with 25,000 miles. zero issues before this

about 2-3 weeks ago, we pull in the garage everything is normal. next time we go to start up the car, the radio screen is blank. So I did some googling and everything seems to point to HMI or the screen itself.

Here are the symptoms:
1- screen in black, but it is back lit (i can see the screen illuminate when we open the door, but the mylink logo does not display)
2- screen and buttons underneath are nonresponsive- except for the button to slide screen up, that will work to access cubby hole.
3- steering wheel controls will control the radio and volume.
4- no bluetooth
5- can drive a few miles, radio will "flicker" off and on a few times, and then just die. restart the car its on but will repeat same flicker and die. has never stayed on for more than 15 min.

Here is what I have checked:
1- pulled radio fuse- no change
2- disconnected battery for 20 min- no change
pulled glove box, checked connections on HMI- no change.


so my questions
without going to the dealer, is there any way to confirm it is the HMI? Our local dealer is not the greatest, and we can't be without a vehicle right now anyway. I dont currently pay for onstar, but I read about people have them push an update to the HMI? could I try that route if I pay for service?

I have access to a 2018 Silverado High Country, I know the HMIs are VIN locked, but could I swap this HMI into my Tahoe to see if the screen comes on with a VIN locked message? I read messages related to corvettes where people bought used ones off ebay and plugged them in to confirm it was the issue. they would get a "VIN lock" message and then go to the dealer for a flash.


appreciate any help

 

[mateyjoe]

Well I got no response from anyone but I can confirm it was the HMI.

I swapped an HMI from another vehicle in and got a theft Lock Screen. Another sure sign it’s the HMI

Ordered a new unit programmed to my vin and we are back in business

 

[Tahoe14]

Thank you for the information. This may help another member.

 

[phottomatt]

My 2017 Tahoe XL just started this yesterday, what is HMI?

Human Machine Interface... Seriously? That's the best they could do?

 

[Dinkmaster]

Well I got no response from anyone but I can confirm it was the HMI.

I swapped an HMI from another vehicle in and got a theft Lock Screen. Another sure sign it’s the HMI

Ordered a new unit programmed to my vin and we are back in business

Hi. Where did you order the module? Dealership? Do you mind sharing the price?

 

[phottomatt]

Mine is almost useless now, it blacks out about every 5 minutes and sometimes takes 10 minutes before touch screen will work again.

 

[kk1lron]

Hey New guy here. joined because im having some issues with my radio

my wife has a 2016 Tahoe LTZ with 25,000 miles. zero issues before this

about 2-3 weeks ago, we pull in the garage everything is normal. next time we go to start up the car, the radio screen is blank. So I did some googling and everything seems to point to HMI or the screen itself.

Here are the symptoms:
1- screen in black, but it is back lit (i can see the screen illuminate when we open the door, but the mylink logo does not display)
2- screen and buttons underneath are nonresponsive- except for the button to slide screen up, that will work to access cubby hole.
3- steering wheel controls will control the radio and volume.
4- no bluetooth
5- can drive a few miles, radio will "flicker" off and on a few times, and then just die. restart the car its on but will repeat same flicker and die. has never stayed on for more than 15 min.

Here is what I have checked:
1- pulled radio fuse- no change
2- disconnected battery for 20 min- no change
pulled glove box, checked connections on HMI- no change.


so my questions
without going to the dealer, is there any way to confirm it is the HMI? Our local dealer is not the greatest, and we can't be without a vehicle right now anyway. I dont currently pay for onstar, but I read about people have them push an update to the HMI? could I try that route if I pay for service?

I have access to a 2018 Silverado High Country, I know the HMIs are VIN locked, but could I swap this HMI into my Tahoe to see if the screen comes on with a VIN locked message? I read messages related to corvettes where people bought used ones off ebay and plugged them in to confirm it was the issue. they would get a "VIN lock" message and then go to the dealer for a flash.


appreciate any help

This describes my issue 100%. 4 months running with an WAMS programmed pair of radio (from 2016 Sierra) and HMI (2017 Cadillac) in my 2015 Yukon XL. One day just as you describe. Occasionally after starting the vehicle the rear camera will work for for 30 to 60 seconds and then off. The radio will generally work, but then just stop and no station will show on the dash. Your attempts to fix are same as mine. I went so far as to plug and replug the CD, Radio, and HMI. I tried MOST bypass of the CD with no change. MOST bypass the radio and of course nothing worked. I am getting access to a GM scan tool, but suspect it won't tell me any more than I think I already know.

UGH...this Android Auto upgrade has been an expensive venture. I thought it was done.

 

[Rookie44]

Well I got no response from anyone but I can confirm it was the HMI.

I swapped an HMI from another vehicle in and got a theft Lock Screen. Another sure sign it’s the HMI

Ordered a new unit programmed to my vin and we are back in business

The wife's 18 RST sat for a month while she was having some medical treatments. When she started it up the screen is dead, but the back up camera works perfectly. I think the screen in fine and the signal being sent to it is the problem. Do you have a part number for that HMI you bought?