Simple Bus Interface (SBI) Serial Data Line

SBI does not communicate with the scan tool via the DLC. SBI information is interpreted by the driver door module (DDM) and transmitted on the Class 2 data link by the DDM.

The simple bus interface (SBI) is used for serial data communication between the four door modules as well as the driver door switch assembly (DDSA).

Refer to A Diagnostic System Check - Door Systems in Doors.