Instrument Cluster: Notes
The instrument cluster is part of the overall driver information system. The design of the E46 instrument cluster is similar to the "low" version cluster introduced on the E39.
The cluster on the E46 still uses the five familiar analog gauges which are the fuel level, speedometer, tachometer, coolant temperature and the fuel economy gauge.
There are also three LCD blocks which display:
- Check Control Pictogram - this area displays information regarding lamp failures, door and trunk status as well as fluid levels (i.e. coolant and washer fluid)
- Odometer Display - this display shows total mileage and trip odometer information. The Board Computer (BC) information is also displayed here. There are 5 pieces of information which can de displayed here by scrolling with the turn signal stalk switch. The new service interval indicator is also displayed here (SIA IV).
- Transmission Display - the transmission range and program indicator is shown here. Any transmission related faults are indicated to the driver by a gear symbol.
In addition to the LCD display blocks, there are various indicator lamps some of which include the oil pressure warning, battery charge indicator, MIL etc.
The E46 makes extensive use of bus network for communication between control other vehicle systems. The bus network also helps streamline communication and reduce the overall wiring requirement.
Other features of the E46 cluster include:
- Stepper motor drives for the analog gauges
- New design Service Interval Indicator (SIA IV)
- Automatic transmission range/program display
The instrument cluster is a sealed unit and contains no serviceable components, other than the back lighting illumination bulbs.