Mechanical Instrument Cluster

MECHANICAL INSTRUMENT CLUSTER
The instrument cluster displays four gauges, a vacuum fluorescent (VF) odometer, a VF PRNDL and up to (18) indicators. One reset button is used to switch the display from trip to total. Holding the button when the display is in the trip mode will reset the trip mileage. The cluster also supplies the power for the panel illumination. Most of the information that is displayed is received over the PCI bus from several modules.

With ignition in "lock", the cluster will wake up and display the door ajar and odometer display when a door is opened. The cluster will also wake up to control the panel illumination. In "off" (unlock) the PRNDL and several indicators will be functional but all gauges will not function. On transition from "off", (unlock) to run, the cluster will perform a check of all micro-controlled indicators, the odometer and the PRNDL for approx. 2 seconds. Other bulb checks with longer bulb check duration will be performed based on bus messages from other modules. If the cluster receives no PCI bus messages for (20) seconds after the transition to "run", the cluster will display "no bus" in the odometer.

A self test can be initiated by holding down the odometer reset button and switching the ignition from "lock" to "off', (unlock). This test will activate the gauges, turn on the indicator lights along with the odometer and PRNDL segments.