![]() ![]() Most of the information in this article comes directly from the PDF files in the resources & downloads section (Under the “K-Bus Structure” and “Resources” folders). – SM, Seat Memory, 1x Driver and 1x Passenger – MM, Mirror memory, 1x Driver and 1x Passenger On the BMW E46, the following control units are on the I/K-Bus: The most informative being the one named “IBUSInsideDRAFTREV5.pdf”. – MRS, Multiple-restraint system (Airbag module) USING NAVCODER WITH USB TO SERIAL DRIVER The bus’ physical layer is an open collector setup – pulled high (+12v) by the bus and pulled low by the talker. This means that the normal voltage on the wire while the bus is idle is +12V (the battery voltage, or Vbatt). A bit is transmitted by pulling low or shorting the bus with the ground momentarily. This is the reverse of many digital signals where the normal voltage is 0V and is raised high (Vmax which in this case is Vbatt or +12v) to send a bit. Serial communications on the bus are 9.6Kbps, 8 data bits, Even parity, and 1 stop bit. USING NAVCODER WITH USB TO SERIAL DOWNLOAD.USING NAVCODER WITH USB TO SERIAL DRIVER.
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