Shift Interlock Systems: Description

Transmission is equipped with a electronically controlled shift lock and cable operated key lock system. See Fig 1 . Shift lock system prevents shift lever from being moved from Park unless brake pedal is depressed. Key lock system prevents ignition key being moved from "1" to "0" position on ignition switch unless shift lever is in Park.

System consists of brakelight switch, key interlock cable, transmission range switch, Transmission Control Module (TCM) and shift lock solenoid.

Fig 1: Exploded View Of Shift Selector Assembly

Courtesy of BMW OF NORTH AMERICA, INC.