Interfaces, Signals

CAN-Bus

The CAN-bus (Controller Area Network) is a serial bus system, in which all connected stations are equally entitled, i.e. each control unit can both send as well as receive. In other words, the connected control units can "communicate" and exchange information via the lines.

Due to the linear structure of the network, the bus system is fully available for all other control units in the event of one control unit failing. The connection consists of two data links (CAN-L and CAN-H) which are interface-protected by means of shielding (CAN-S).

The control units AGS, ASC/DSC (M62 only) and digital motor electronics (DME) are currently interconnected with this system. Linking-in of further control units will follow. The following signals are exchanged between AGS, ASC/DSC and DME control units via the CAN-bus:
- Accelerator pedal position
- Load signal
- Engine speed
- Driver program
- Gear
- Engine intervention
- Wheel speeds (M62 only)

The connected control units must all have the same CAN status. The CAN status can be checked via the diagnosis interface. The CAN status (bus index) is specified in the identification of the relevant control unit connected to the CAN-bus.