Brief component description
Main buses are responsible for the inter-system data exchange between the control units. This also includes the system functions diagnosis, programming and encoding.
Sub-bus systems exchange data within a function group. For example, if the data of the intelligent battery sensor or the preheating control unit from the engine control (DME) is read in.
Example, engine control (DME)
| Item | Explanation |
|---|---|
| 1 | Active air-flap control |
| 2 | Intelligent battery sensor |
| 3 | Preheating control unit |
| 4 | Coolant pump for charge air cooler |
| 5 | Engine control |
Further examples are:
- Connection of the footwell module to the switch block of the driver's door and the exterior mirror
- Connection of the roof function center to the rain-light-solar-condensation sensor
- Connection of the Automatic air conditioning the 15 servomotors
Example, footwell module (FRM)
| Item | Explanation |
|---|---|
| 1 | Operating facility for light |
| 2 | Driver assist systems control panel |
| 3 | Exterior mirror, driver's side |
| 4 | Exterior mirror, passenger's side |
| 5 | Seat adjustment switch block, driver's side |
| 6 | Seat adjustment switch block, passenger's side |
| 7 | Driver's door switch block |
| 8 | Headlight driver module, left |
| 9 | Headlight driver module, right |
| 10 | Footwell module (FRM) |
In a LIN bus system, there is always only one master control unit installed. A maximum of up to 16 users (so-called slaves) may be connected. There is no prescribed bus structure. The maximum cable length for a LIN bus is limited to 40 meters. The data transfer rate of the LIN spans from 2.4 to 19.2 kBit/s. A closing termination is not absolutely necessary due to the lower data transfer rate.