Bus Systems

The instrument pack has two controlling microprocessors which process software information and control input and output data for the instrument pack and other systems. The processors communicate with other systems on the vehicle via four interfaces: I Bus, K Bus, CAN and diagnostic DS2 Bus. An 8 Kbyte, non-volatile memory (EEPROM) is provided for the storage of vehicle and instrument data (eg; mileage reading, service interval status).

The instrument pack also features a self diagnostic feature and on-board diagnostics via communication with T4. Inputs are received as either analogue signals via conventional hardwired connections or as digital signals via multi-channel connections with the bus systems. These signals are filtered and evaluated by the processors and the data converted into actuation of the analogue gauges and indicator/warning lamps. The processors also function as a gateway for the bus systems, processing data from one system and passing it to another.

The instrument pack receives and transmits data on five bus systems as follows: