Principles of Operation

PRINCIPLES OF OPERATION

The message center is an integral part of the instrument cluster. The message center communicates with the powertrain control module (PCM), the front electronic module (FEM), the rear electronic module (REM), and the anti-lock brake system (ABS) module over the communication network. As a technician, it is important to understand:
- where the input (command) originates from.
- all information (messages) necessary in order for a feature to operate.
- which module(s) receive(s) the input or command message.
- does the module which received the input (message) control the output of the feature, or does it output a message over the communication network to another module?
- which module controls the output of the feature.

Display Information
The display modes are:
- fuel (average fuel economy, distance to empty)
- setup
- system status
- warning
- temporary alert

The message center information can be selected by pressing any of the following 4 buttons:
- FUEL
- RESET
- SETUP
- STATUS

The setup display and the status display times-out and default to the fuel blank display function. The temporary alert display interrupts the current display to show the status of an event that has just happened. The warning display interrupts the current display until cleared or reset by the driver.

Status Displays
The status displays are timed modes and default back to the fuel blank display function. The status display modes are:
- oil life %
- AC air filter life %
- charging system
- low oil
- engine temperature
- brake fluid level
- washer fluid level
- driver door
- passenger door
- driver rear door
- passenger rear door
- luggage compartment lid
- headlamps
- front turn lamps
- side repeater lamps
- rear turn lamps
- stoplamps
- tail lamps
- traction control
- advance trac

Setup Displays
The setup displays are timed modes and default back to the fuel blank display function. The setup display modes are:
- English/metric units
- autolocks on, autolocks off
- easy exit seat on, easy exit seat off
- autolamp delay
- lock chirp on, lock chirp off
- language

Warning Messages
The warning messages can interrupt the display until cleared or reset by the driver. The warning messages are single cycle, non-resettable, and repetitive warning messages. The single cycle warning messages are:
- change oil now (0%)
- change oil soon (1%-5%)
- low oil level
- low washer fluid level
- low brake fluid level
- check headlamps
- check brake lamps
- check tail lamps
- check front turn lamps
- check rear turn lamps
- change A/C air filter soon
- luggage compartment lid
- check fuel cap
- service park brake
- apply park brake

The single cycle warning messages display once whenever the ignition switch is turned to the ON position or a fault occurs in a system and can be cleared by pressing the RESET button.

The repetitive warning messages are:
- check charging system
- low fuel level
- check transmission
- transmission overheated

The repetitive warning messages are displayed at a fixed interval whenever the ignition switch is turned to the ON position or the ACC position. To remove a repetitive warning message, press the RESET button. The message recurs after 10 minutes or until the warning condition is corrected.

The non-resettable warning messages display whenever the ignition switch is turned to the ON position and a fault occurs in a system. The fault must be corrected to clear the non-resettable warning messages.

The non-resettable warning messages are:
- stop engine safely
- driver door ajar
- passenger door ajar
- driver rear door ajar
- passenger rear door ajar
- decklid ajar switch
- park brake on
- ETC-engine failsafe mode

Temporary Alert Messages
The temporary alert display interrupts the current display to show the status of an event that has just happened. The temporary alert messages are:
- autolamp delay
- memory recall/save
- traction control
- advance trac
- speed control ON/OFF status