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Control module

Control module


The main instrument unit consists of three replaceable main components:


• Instrument unit

• Control module (electronic unit MIU)

• Odometer display


The control module is integrated in the main instrument unit and has 2 connectors, one 12-pin (K12) and one 20-pin (K20).

The main instrument unit differs between engine variants. Cars with petrol engines that are not equipped with Trionic 7 are not fitted with a P-bus, so a 22-pin connector (K22) is added. Cars with diesel engines and cars with Trionic 7 do have a P-bus and therefore do not require the 22-pin connector.

The control module receives information from its own sensors and switches as well as from other systems. It processes the information and uses it to control instruments and lamps. Certain information is put on the bus.

When a fault occurs, the control module stores the diagnostic trouble code. In case of replacement, a control module for that specific car must be ordered and its programming will then be carried out at Saab Automobile. The odometer reading stored in the old control module and shown on the display must be programmed into the new control module.

The instrument unit contains gauges and meters controlled by its own control module on the basis of information received from other systems as well as its own sensors. Warning and indicator lamps which are controlled by their own sensors/switches as well as control modules from other systems. All the warning lamps, indicator lamps and light bulbs (not LEDs) are replaceable.

The odometer and tripmeter display has two number registers, one with six digits for showing the odometer reading and one with four digits for the tripmeter reading.

The control module stores the distance driven and displays it. There is a lamp in the display which is replaceable.

Diagnosis

If an internal fault occurs in the main instrument unit's control module, diagnostic trouble code B1605 is set.