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Originally Posted by apw2607
The way it works as this. The coding computer determines what ECUs (Electronic control units) on the car need updating based on their current configuration. This is why, in some cases reprogramming a BMW can take almost 8 hrs if a large number of ECUs need to be reprogrammed.
So by installing say the sirius receiver, although the technician will go through the retrofit procedure, its certainly possible that other ECUs will get reprogrammed during the procedure.
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Let's say if I take my car in tomorrow, do I ask them to update all ECUs? How do I know whatever is the latest version of updates? I took my car in last time and they reprogrammed my steering wheel for exmaple, so it now pushes in and tilts up when I exit the car -- it used to go up only.