Circuit Operation

The instrument cluster serves as the primary interface for the vehicle' 5 driver.

The instrument communicates with other major electronic components over a class 2 serial data line. The instrument cluster used in this vehicle is either a base or an uplevel (UB7). The following list is a list of instrument cluster functions:
^ Speedometer
^ Engine RPM (Tachometer)
^ PRNDL
^ English/Metric Display
^ Fuel Level
^ Odometer Display
^ Driver Information Center (DIC) Display (W/UB7) The following list indicates the warning messages:
^ Head up display (HUD) interface (W/UA6)
^ Warning/status indicators:
^ Anti-lock
^ AIR BAG
^ BRAKE
^ High beam
^ SECURITY
^ SERVICE ENGINE SOON
^ SERVICE VEHICLE SOON
^ Turn signals
^ Fasten safety belt

The instrument cluster has the capability to diagnose malfunctions in the following the cluster controls or to which the cluster communicates:
^ The sensors
^ The input switches
^ The components
^ The systems

When the instrument cluster or other microprocessor-controlled module, detects a malfunction, the cluster may turn on an instrument cluster indicator or request/display a message to the DIC. This alerts the driver that a malfunction has occurred. Some indicator lamps and instrument cluster messages have dual controls.