Dynamic Digital Inputs

Distance signal - This information is supplied to the IKE by the ASC/DSC control module with a square-wave signal. Pulses from the left-rear wheel speed hall sensor are used to produce signal. The IKE processes this for the cluster display and provides a speed signal output on the I / K busses.

Engine speed signal - The TD signal is produced by the DME and sent to the IKE. This is a CAN bus signal on vehicles produced after 9/97. Engine speed is re-transmitted over the I/K buses by the IKE.

NOTE: The wiring continues to exist as in the earlier systems but the cluster is coded to only accept the information from the CAN.

Injection Signal - The DME supplies the signal to the IKE for fuel consumption evaluation. This signal is also transmitted via the CAN on later vehicles.

Fig 1: Identifying Dynamic Digital Inputs

Courtesy of BMW OF NORTH AMERICA, INC.

Dimmer signal - This is a pulse-width modulated signal from terminal 58, of the Lamp Control Module. It is used to control back lighting of instruments and the LCD and is also transmitted through the I/K buses.

Transmission Interface - This single-wire is a serial one-way interface that provides the IKE with selector lever position, driving program and the fault message. This information is provided over the CAN on vehicles from 9/97.