u/the3teesargents

Currently working on upgrading my 2015 Buick Lacrosse Infotainment to add Carplay, as it is not on my current model. I do not have the Naviagtion package on my original 2.0 HMI.

I recently went to a junkyard and pulled a HMI 2.5, A11 ACM, and dual USB port from a 2018 Malibu. I put both into the car and reprogrammed both on SPS2 while the car was in accessory mode, ACM and then HMI, and plugged in the USB port. The theft lock came on and stayed during ACM programming (as expected) and then during the HMI programming, the screen blipped a couple times, and then said "THEFT LOCKE", like it cut off the E. I took out the keys and let the car sit for a few minutes with the doors closed. Went back into the car, and the digital cluster came on, and said "Audio Off", and the infotainment screen was lit up, but black.

I used my VCXNano to look in GDS2 and see what was going on with the HMI. The labeled VIN was not my vehicles VIN, and there was a DTC code saying that there was "High Voltage". I had the vehicle plugged into a battery tender the entire time.

I swapped the parts out at my junkyard with another HMI and ACM from a 2016 Malibu, thinking it was a hardware issue. And the same issue has occured a second time.

Any advice or ideas on what the issue is? Im really out of guesses now. I didnt do any USB updates to software on the HMI, but I dont think that would cause a voltage issue?

Currently working on upgrading my 2015 Buick Lacrosse Infotainment to add Carplay, as it is not on my current model. I do not have the Naviagtion package on my original 2.0 HMI.

I recently went to a junkyard and pulled a HMI 2.5, A11 ACM, and dual USB port from a 2018 Malibu. I put both into the car and reprogrammed both on SPS2 while the car was in accessory mode, ACM and then HMI, and plugged in the USB port. The theft lock came on and stayed during ACM programming (as expected) and then during the HMI programming, the screen blipped a couple times, and then said "THEFT LOCKE", like it cut off the E. I took out the keys and let the car sit for a few minutes with the doors closed. Went back into the car, and the digital cluster came on, and said "Audio Off", and the infotainment screen was lit up, but black.

I used my VCXNano to look in GDS2 and see what was going on with the HMI. The labeled VIN was not my vehicles VIN, and there was a DTC code saying that there was "High Voltage". I had the vehicle plugged into a battery tender the entire time.

I swapped the parts out at my junkyard with another HMI and ACM from a 2016 Malibu, thinking it was a hardware issue. And the same issue has occured a second time.

Any advice or ideas on what the issue is? Im really out of guesses now. I didnt do any USB updates to software on the HMI, but I dont think that would cause a voltage issue?

Im planning on upgrading my 2015 Buick Lacrosse HMI 2.0 to a newer 2.5 in order to have Carplay. Ive done a little bit of research, and I know I'll need to reprogram the 2.5 HMI to match my VIN (I can do this on my own) as well as getting a new USB plugin compatable with carplay and my vehicle, but im stumped on the radio. I hear some are replacing their entire radio module, and some saying they updated their old one via USB. I can do the update on my own, but is there another reason I would need to get a new radio? And many say radio MODULE, meaning the screen? Or is it a different component to the radio?

Any advice would be greatly appreciated!

Im looking to add carplay into my 2015 Lacrosse, and I only see a couple of options. Im pretty savy with car maintenance, so my first thought was to find an OEM 2016 headunit (which has carplay), and swap it out for my 2015. Would there be any other modifications needed? I havent found a straight up answer on if its compatable or not. I would assume more is needed in order to "project" the phone interface onto the screen, but have yet to get an answer.