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BoydRB last won the day on January 25

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About BoydRB

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  1. Thx again for posting the info from the service bulletin. Looks like my dealer's technicians learned about this for the first time trying to reprogram the salvage module I installed. Just to finish up this thread, the last thing I tried was complete disassembly of the module (which has about 5 different circuit boards layered in the chassis) to see if I could locate a board with an eeprom containing the VIN. I was unable to locate an eeprom on any of the boards, but decided the VIN was probably stored on one of the 2 boards with CAN bus interfaces on them (audio board and main board). I tried swapping out each of these boards for boards from the module with the non-matching VIN. When the audio board was swapped out, the module remained locked, but when the main board was swapped out with my original board, the system unlocked. Unfortunately, the main board with my correct VIN was probably also the board that was not functioning correctly in my original system, since I am now back to the original functionality (only some aspects of the system work). Bottom line seems to be that the simplest solution may be to just buy a new, unprogrammed module.
  2. Thx for your response Logan, appreciate you taking the time to share your knowledge with me. It's perplexing to me that the technicians at a GM/Cadillac dealer wouldn't know if an OEM module could be unlocked or not with their own diagnostic and programming tools. They spent a few hours trying to unlock my module, so it seems they believed it was possible. I've asked around from a few other automotive techs, and they all seem to believe the unlock should be simple, and have never heard of "one-time only VIN programming". Also, I have found instructions on the web for performing a VIN relearn / unlock sequence on GM navigation radios using the Tech 2: As an alternate solution, I've also seen a number of videos & posts where the eeprom containing the VIN is removed (or unpowered) as a solution, however I have as yet been unable to locate an eeprom on the circuit boards from the old module I took out. I am starting to wonder whether the issue is related to my module being a full system (am/fm/xm radio, video disc player, navigation, mp3, and hard drive) complete with system software licensed to GM by Microsoft. Perhaps this system is engineered differently than the standard radio + disc player configurations, and requires a different unlock sequence, but then again I would expect the GM technicians to know that!
  3. I recently lost some radio/cd/nav/hard drive unit functionality (no output to nav touchscreen, unable to access music on hard drive, CD player not working) in my 2009 CTS. I replaced the entire unit (GM part # 25979736 with an identical unit from another 2009 CTS, and it displays the expected "locked" message on my touchscreen. I took it to my local dealer to have it unlocked but they were not successful. The report from the service technician stated that he: (1) verified communication with the radio through the diagnostic port, (2) programmed the radio with the latest calibrations (radio did not unlock), and (3) attempted to reset the radio manually (radio did not unlock). The report then stated I would need a new unit, and that the VIN burn for this radio is "one-time only". Has anyone ever heard of this or experienced a similar problem? Or should I assume the service technician didn't know the proper procedure to unlock the radio? My understanding is that I should be able to unlock it myself if I have access to a GM Tech2 scan tool. Has anyone ever unlocked this particular radio from the 2009 CTS or had one unlocked by the dealer? It doesn't sound plausible to me that GM would make a part that can't be reprogrammed or relearn the VIN for another vehicle.