I'd like to thank DenverGP for the info and pics. 260 spent and, I'm gonna guess about 1200 saved!
i have a 2017 as well with 32000 miles and warranty over in November 2019 my screen went blank to onstar says take to dealer touched positive and negative wires together "off of battery taped together to drain condensers in whole system, with no results all fuses good hardly use car looks like this is a common problem. do I do the dealer thing and then start shopping parts or take to a car stereo repairman? Could use some good info. Thanks,Well, rather than try to mess with another clueless dealer, I went the hacker way.
Found information about disassembling the radio itself (the silver box), to get the EEPROM chip on the circuit board, and using a $10 USB eeprom programmer off ebay, was able to change the vin myself.
Got the EEPROM updated, radio reassembled, and reinstalled in the equinox, and it's working perfectly.
If anyone else ever has to deal with this, hit me up. Time to pull radio, disassemble, flash the eeprom, reassemble and reinstall in vehicle was about 3 hours.... That's actually less time than I wasted at the dealership only to have them not be able to do it.
Yeah I don't have a clue. I wasn't trying to get the system to come back on. It was cold out and I hit the heated seats buttons and all of a sudden the MyLink system kicked back on. After 2 weeks of a blank screen. Now that I think about it I really did not know if the heated seats worked anymore. I just hit the buttons without thinking about it. My Equinox came with all the bells and whistles in the center counsel, nav, auto climate control, etc. At night the center counsel was completely dark except the climate control buttons at the bottom. It's all working fine now, no glitches at all. I am kind of expecting it to mess up again one of these days. For now its all good. I called the dealership and told them never mind on bringing it in. While talking to the service advisor I kind of got the impression that they are used to glitches with the MyLink system.GMTool---WOW! What an interesting remedy. Coincidence or did it actually cause a "power" spike that reset something? I'm going to watch for comments from others that may explain what happened and why.
Thanks for the help DenverGp... I am googling as much as i can so i don't bother you too much. I found a video demoing the reader/writer but i have a question on the software. I got the file extracted (see Below) now should i first install the driver file 24CXX25XX and then which app do i chose to read/write the chip? (my virus scanner popped up giving me a warning and removed CH341A.exe saying it was a trojan so that is why it's not listed).Feel free to reach out if you have any issues with the VIN update process, I'll be happy to help.
So rewrote the chip in the new radio put it back together plugged it in and BOOM it worked!! I am so happy! My only regret is that I didn't see these instructions earlier. So if your radio is lagging, erratic just what DenverGp's radio was doing. Don't waste your time at the Dealer, the service managers at my dealership look like they just graduated high school, they will just take your money and quote you $1400 for a remanufactured radio installed. The only thing the dealer is good for is the parts department can tell you which radio model you have by giving them the VIN. Mine was 84064074. You can then find a wrecking yard radio that matches, I used Wilberts on Ebay which they say you have have to take it to the dealer to be reprogrammed. I did that and wasted $130. If your not real handy you might be able to find a electronics/TV guy to rewrite the chip and your local mechanic to swap it out for you.
My total cost should of been $10 for good trim tools, $65 for the radio, and $10 for the programmer... $85 total. I screwed around with the dealer and wasted $260. But I'm still saving a bunch. I'm happy!
Thanks Again to DenverGp and others for the info. And for those who are thinking about doing it themselves... go for it. Pulling the radio the second time was easy (find a video online) and the radio comes apart easy to. There are little tabs on both sides of the XM ribbon cable that need to be lifted to remove and pressed back down when reinstalling (someone mentioned that earlier here which helped).
This is an AWESOME How-to thread! View attachment 16872