I coded it first along with my auto start stop. It worked fine till I tried flashing my car with BM3 and that messed up the ECU settings. I lost both those codings while other codings stayed, which was weird. I then redid auto start stop and acoustic signal when reverse gear is engaged. Auto start stop works but acoustic didn’t work this time even though it showed it was active.
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Current:
2020 BMW 330i xDrive
2018 Audi SQ5 Prestige
2017 Audi A7 Prestige
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