BMW Data Link Interface Project

The Basics

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20-pinconn.gif
BMW 20-pin Data Link connector

The principle is simple.  BMW dealers can connect a computer to the 20-pin connector under the hood, and do all manner of impressive things.  (See capabilities.)  There are two parts of this:
 
  • The hardware aspect, which is just getting the two machines to talk to each other.


  • The software aspect is figuring out what they should say -- what commands to send to the ECU, and how to interpret what it sends back.
 

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