Originally posted by Kronik
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However, the definitive answer on why the coding varies is because the Central Electrics module (and the version of the software that runs the module) is typically different for Australian-delivered cars to that of US-delivered cars, and therefore, the coding sequence required may differ. Remember that Central Electrics controls a lot more than just the tail lights, which goes some way to explaining why there are multiple versions for multiple markets. Some countries impose unusual legal requirements on vehicle lighting and other functions, which would need to be catered for by specific modules / software / configurations.
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