Since 5/97 an instrument cluster has been phased-in which features the plugged-on instrument cluster electronics (IKE ) integrated in the display unit (AE ). This instrument cluster can replace older instrument cluster versions.
The instrument cluster uses the engine speed signal from the engine control unit (td for petrol engines) to determine the engine speed. Adaptation to match the various types of engines takes place by means of the stored coding data.
In the case of the integrated version of the instrument cluster, phased-in as from 5/97, the coding data defines whether the engine speed signal is routed via the CAN bus or via a separate line to the instrument cluster.
As of terminal 15 "ON", the engine speed instrument (rev counter) is controlled by the instrument cluster electronics (IKE ) with the corresponding engine speed signal. The engine speed information is also made available on the instrument bus(I-bus ) and body bus (K-bus ) for other control units.