Buses and control units on the E90, E91, E92, E93

The most important buses on the E90 are: K-CAN, MOST, PT-CAN, F-CAN.

The new feature is that the footwell module (FRM) is connected to the PT-CAN. This is because:

• The adaptive headlights are integrated into the footwell module. The adaptive headlights need the high-speed PT-CAN.
• The longitudinal dynamics management sends the signal for the brake light on the PT-CAN.

Compared with the E87, some new control units are connected to the F-CAN, e.g. LDM and ACC (LDM: longitudinal dynamic management; ACC: active cruise control).

> E90, E91, E92, E93: Buses and control units: