Transmission Control System (GS 20): Notes

WARNING: This page does not describe the selected car, but rather 43 other vehicles, including the 2006 BMW M3, 2006 BMW 330Ci, 2006 BMW 325Ci, 2005 BMW M3, and 2005 BMW 330xi. However, it is still accessible from the selected car via links, so may be relevant.

System is controlled by the GS 20 control module. The acronym (GS) comes from the German word "Getriebesteurung", meaning Gearbox Control. The design, program development and manufacturing of the GS 20 control system is the result of the combined efforts of BMW, Siemens and GM. The GS 20 control module is located in the E box in the engine compartment. See Fig 1 . It utilizes the 134 pin, "SKE" (standard shell construction), modular connector, enclosure. See Fig 2 , Fig 3 and Fig 4 .

Fig 1: Identifying GS 20 Control Module Location

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 2: Transmission Control Module Identification

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 3: Identifying Control Module Connectors

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 4: Identifying Transmission Control System

Courtesy of BMW OF NORTH AMERICA, INC.