Brief description

Brief description

•	Main instrument unit, MIU (540)

•	Engine Control Module (ECM)

•

SID (541)

•	Column Integration Module, CIM (703a)

•	TCS/ESP (382/671)

•	Fuel level sensor (46)

•	Wheel speed sensor (298)

•	Steering wheel controls (633)

Description

The main instrument unit is used to convey information to the driver by means of gauges, display information and indicator and warning lamps.

The head unit receives information from other control modules via the I-bus. The control module processes the information and regulates gauges, the display, warning and indicator lamps internally (except for the Check Engine lamp, which is regulated by the engine control module (ECM) by the ECM grounding the lamp).

The gauge needles are regulated by individual stepper motors. Scales, needles, indicators and the display are illuminated by means of LEDs. The control module transmits bus information, such as button and display illumination. The head unit is equipped with its own diagnostics function and a diagnostic trouble code is generated in the event of a fault.

The main instrument unit incorporates the following:

•	Speedometer

•	Odometer/tripmeter

•	Tachometer

•	Fuel level gauge

•	Coolant temperature gauge

•	Turbo boost gauge

•	Warning and indicator lamps

•	Main instrument unit display

•	Instrument and display lighting

The main instrument unit carries out calculations for the following functions:

•	Fuel level

•	Sums up and stores driven distance

SID, display and buttons

•	Main instrument unit, MIU (540)

•

SID (541)

•	Column Integration Module, CIM (703a)

•	Steering wheel controls (633)

•	Control module, BCM (707)

•	Switch panel (737a)

Description


SID has two components:

- the symbols for warnings and indications

- text information, which can cover up to two rows.

Test messages are transmitted on the I-bus and are displayed in SID.

The following functions in the information display are adjusted using the INFO and SET buttons on the left side of the steering wheel:

•	Trip functions

•	Function reset

•	Check message deletion

•

Settings