E46iC BUS System: Notes
The Bus system of the E46iC continues to use the K-Bus as the main communication link between body and driver information modules. The Convertible Top Module (CVM) is added to the K-Bus for communication with the GM V for top operation and the Instrument Cluster for diagnostic purposes. The addition of memory functions for both outside mirrors has required memory modules to control the operation. These modules are also connected to the K-Bus for communication with the Seat Memory module.
As with other MRS III systems, the MRS module is now connected to the K-Bus for coding/diagnostic and communication with the other control modules.