Instrument Cluster (IC), Operating Instructions

Shows Instrument Cluster During Lamp Check:

General
The instrument cluster (A1) has the following junctions:
- To provide information about important operating states of the vehicle (e.g. speed, fuel reserve.),
- To warn the driver about critical operating states
- To function as a display for various Systems (e.g. audio, trip computer...),
- To function as a computer and display for the "active service system" (ASSYST)
- To function as a trip computer

To perform these functions, the instrument cluster (A1) is equipped with the multifunction display (A1p13), various meters and gauges, warning and malfunction indicator lamps as well as an acoustic sensor.

Moreover, various signals are generated in the instrument cluster (A1) (e.g. "speed", "Term. 58d"...) and passed to the engine compartment CAN and/or the passenger compartment CAN.

Almost all the necessary information (except the signal for the airbag indicator and warning lamp A1e15) is passed from the various control modules to the instrument cluster (A1) on the engine compartment CAN or the passenger compartment CAN. Only a few wires are required to connect the instrument cluster to the rest of the vehicle. The instrument cluster (A1) is equipped, therefore, with just one connector.

A microprocessor is installed in the instrument cluster for processing data received from the control modules. The program and necessary data are stored in an electronic memory chip.


The program is operated using the system select/voice control pushbutton (S110s3), the scroll forward/back pushbuttons (S110s1) of the multi-function steering wheel and the two buttons on the instrument cluster (A1).


NOTE: Diagnosis is performed with the STAR diagnosis tool.