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Diagnostics communication

Diagnostics communication





In the Saab 9-3, half of all control modules are connected to a bus. The bus is divided into a P-bus (Powertrain Bus) and an I-bus (Instrument Bus). Both buses are connected to the main instrument (MIU). The buses are electrically isolated.

The diagnostics tool is not directly connected to a bus, but communicates with DIVE, one of the control modules connected to the I-bus and thus has access to all control modules connected to a bus.

All information sent out by a control module is available on all control modules connected to a bus. MIU is responsible for making sure that information available on the one bus also is available on the other bus.

For further information regarding Bus and diagnostics communication, see 3, Bus and diagnostics communication, Technical description, Diagnostics communication