Principles of Operation
PRINCIPLES OF OPERATIONThe message center electronic functions use both hardwired and CAN circuits to receive information. It is very important to understand:
- where the input (command) originates.
- all the information (messages) necessary in order for a feature to operate.
- which module(s) receive(s) the input or command message.
- which module controls the output of the feature.
Display Information
The display modes are:
- information
- setup
- system check
- warning
- temporary alert
Various message center information can be selected and reset by pressing the following buttons:
- SET
- INFO
The select display and the reset display time-out and default to the information display mode. The temporary alert display interrupts the current display to show the status of an event that has just happened and disappears after a few seconds. The warning display interrupts the current display until cleared or reset by the driver.
Message Center General Displays
The message center display is a 2 row by 12 character LCD display. The display is controlled by a 2 button switch module that includes INFO and SET buttons outside of the instrument cluster. The information displayed in the message center display falls into 4 main categories:
- information
- warnings
- temporary alerts
Message Center Information Displays
The INFORMATION DISPLAY mode is entered by pressing the INFO button. Subsequent presses of the INFO button scroll through the menu features of the information display. All warning displays must be cleared for the instrument cluster mode to display INFORMATION DISPLAY.
System Check
When the SET FOR SYSTEM CHECK information is currently displayed, pressing the SET button leads the instrument cluster to initiate the system check function. The system check function provides the driver with the current status of certain vehicle functions. The status of each function is displayed sequentially on the message center. The driver has the ability to scroll through the system check displays by repeatedly pressing the SET button, or the display automatically scrolls at 2 seconds time out per display. The system check function can be terminated at any time by pressing any message center switch other than the SET button.
Warning Indicators and Messages
Warning Indicators And Messages:
The warning messages have precedence over all other messages. Every warning message is displayed. The messages can be single cycle, non-resettable, or repetitive. The instrument cluster indicators that are illuminated when a fault occurs and the message that follows are shown in the table.
Warning Messages
The instrument cluster messages that are displayed when a fault occurs are shown in the table.
The warning messages continue to cycle in order until the vehicle condition causing the warning is corrected, until the ignition switch is turned to the OFF position, or until the message center is reset while the warning is displayed. A warning is removed from the display when the message center is reset unless the warning is non-resettable. A repeated warning message is removed from the display when the message center is reset and displays again after 10 minutes if the warning condition is not corrected. The single cycle warning message is removed from the display when the message center is reset and is not displayed again until the next ignition cycle. Multiple messages are cycled through in a fixed order with a display of 4 seconds for each warning. No other display modes are allowed while a warning message is displayed.