Quote:
Originally Posted by tom @ eas
The OBD2 port is intercepted, making it useless for diagnostics while in use. Meaning one must remember to disable the module in order to a tech to perform a diagnostic scan if troubleshooting (not only related to DME).
Worst case scenario would be forgetting to turn off the module and a BMW tech spending time troubleshooting why a scanner isn't communicating properly.
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But your valve control module wire taps in to the CAN BUS wires at the OBDII port too.
I always thought it would be required that a CAN BUS enabled tune would turn itself off it anything was ever connected to the OBDII port but now I understand why they have not enabled it that way. It's a sneaky way to block would-be car thieves. I would be willing to bet if users were to demand that the piggyback disable itself if anyone were to plug in to the OBDII port such a firmware revision or option would be quickly released. Has anyone ever asked for this?