Instrument Cluster (IC), Function

Instrument Cluster (IC), Function







General
The instrument cluster (A1):
- Provides information about important vehicle operating conditions (e.g. speed, amount of fuel...)
- Provides warnings of critical operating conditions
- Functions as display for various systems (e.g. audio, trip computer, etc.)
- Functions as computer and display for the "Active Service System" (ASSYST)
- Functions as a trip computer

To perform these functions, the instrument cluster (A1) is equipped with the left multifunction display (A1p13) and right multifunction display (A1p15), various meters and gauges, warning and malfunction indicator lamps as well as an acoustic transmitter.

The instrument cluster (A1) also generates various signals (such as "Vehicle speed", "Terminal 58d"...) and relays them to the engine compartment or interior compartment CAN.

Virtually all of the required information (with the exception of the signal for the airbag indicator and warning lamp (A1e15)) is relayed from various control modules over the engine compartment CAN or the interior compartment CAN to the instrument cluster (A1).

For this reason, only a few lines are required to connect it with the rest of the vehicle. The instrument cluster (A1) thus has only one plug connector.

The instrument cluster contains a microprocessor to process the incoming data. The program and the necessary data are stored in an electronic memory chip.

The program is operated using the system select pushbutton (S110s3), the scroll forward/back pushbutton (S110s1) on the multifunction steering wheel and the instrument illumination dimmer and reset button (A1r1) on the instrument cluster (A1).

NOTE: Diagnosis is performed with the STAR Diagnosis tool.