Simple Bus Interface Serial Data Link

The Simple Bus Interface (SBI) is a serial data link. This serial data link replaces vehicle cables between the various door modules with a single wire. The same amount of information is sent by multiplexing (time-sharing) data to and from each device over that wire. The serial data signals are referenced to ground. If the Simple Bus Interface is lost, both the Rear Door Module (RDM) and Passenger Door Module (PDM) will go to sleep. With the RDM and PDM asleep, no power window operations are possible.