![]() 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 ***
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