The most informative being the one named “IBUSInsideDRAFTREV5.pdf”. 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). Both of these bus systems are technically identical, the only difference is their use by model. From this point forward they will be referred to as the I/K-Bus and differences will be pointed out separately. Models without Navigation or IKE will use the K-Bus only. The K-Bus was added to the E38 along with the I-Bus. With the introduction of the E38, the I-Bus is now referred to as the instrumentation bus. The E31 version of the I-Bus was used for body electronics and driver information systems. The I-Bus is known as the “Instrumentation-Bus” and the K-Bus is the “Karosserie-Bus” – Karosserie is German for “Body”. Initially the I-Bus was introduced on the E31 as the information bus. The I/K buses handle information/multimedia peripherals. Since the K-bus has available only one single line yet it transmits data in both directions, data are transmitted in half-duplex mode – it is possible to only transmit or receive at any one time. In other words, it is a way for devices within the car to communicate with each other. The K-bus is a serial communications bus in which all connected control units can send as well as receive information over a single wire. The K-Bus is a standard bus protocol for BMW car electronics. *** Project: Arduino & BMW K/I-Bus Interface ***

Using navcoder with e39