Brief description of the main instrument unit: General

The main instrument unit conveys information to the driver and functions as an information link between the P-bus and the I-bus.

The vehicle speed is essential information for many control modules. The rear left wheel sensor is used by ESP to obtain wheel speed information. MIU receives wheel speed information from the ESP control module via the P-bus. MIU converts the wheel speed information to vehicle speed and sends it on the buses.

The main instrument unit has its own diagnostics function and sets a diagnostic trouble code when a fault occurs.

The main instrument unit incorporates the following:

• Control module
• Speedometer
• Tachometer
• Odometer/trip meter
• Fuel gauge
• Coolant temperature gauge
• Turbo boost gauge
• Instrument and display lighting
• Warning and indicator lamps