Standard Corporate Protocol (SCP)

Item Description
1 Instrument Cluster
2 Body Processor Module (BPM)
3 Passenger Door Control Module (PDCM)
4 Passenger Seat Control Module (PSCM)
5 Security and Locking Control Module (SLCM)
6 Driver Seat Control Module (DSCM)
7 Diagnostic Connector - LHD Shown
8 Driver Door Control Module (DDCM)
9 Standard Corporate Protocol (SCP) Network

The modules illustrated, form the body control system and are connected by a two-wire multiplexed SCP bus. The SCP bus is a high speed, serial communications system.

Control messages and data are passed between modules at a speed of up to 785 complete messages per second. Passing information in this way between modules, saves using large amounts of copper cable which would be necessary if all modules where hardwired together around the vehicle and provides the facility for more electronic control of various functions, which where not feasible previously.

The functions performed by a particular module depend totally on its location within the vehicle (called Zonal Partitioning) and not on its name. For example, the Security and Locking Control Module, located in the luggage compartment, performs the security and locking functions, as expected, but also controls most of the rear lamps and the bulb fail module, under instructions passed to it via the SCP bus from the Body Processor Module.