Signal Path

When the shift +/- buttons are pressed, the signal is sent via the steering wheel electronics module and the slip-ring to the SZL module.

From the SZL the signal is passed on to the byteflight bus.

It then travels via the Safety Information Module (SIM) and the Central Gateway Module (ZGM) to the PT-CAN and ultimately the EGS (TCM) where it is processed.

For safety reasons, there is a hard-wired serial data cable available as redundant back-up in case of any bus problems.

Fig 1: Signal Path

Courtesy of BMW OF NORTH AMERICA, INC.