D-Bus System

The D-Bus is a serial communications bus that transmits data between the DISplus and the connected control units. The control unit subject to diagnosis is selected by sending a diagnosis telegram to the control unit address. By request from the DISplus, the control unit transmits information and the contents of the fault memory or activates a control unit output. The D-bus is only active when the DIS or MoDIC is connected to the diagnostic socket and communicating.

• D-Bus is connected to power train (emission) related control units.
• DS2 Protocol Bus is connected to control units that do not affect emissions and the IKE.

  Through the IKE communication with the K-Bus is possible.

The operating voltage of the D-bus is 12 volts. The voltage measurement is taken from each data line connection to ground. Each module on the D-bus provides its own voltage.

D-Bus operation and signals are similar to K-Bus.