Operation

OPERATION

The Instrument Cluster (IC) receives and sends messages via the Programmable Communication Interface (PCI) and the Controller Area Network (CAN) data bus. The indicator lamps will illuminate briefly for a bulb check when the ignition is turned from off to run. All of the gauges receive their information via the CAN Bus from the Next Generation Controller (NGC) and the Body Control Module (BCM).

The Customer Information System (CIS) main control module is the cluster. The cluster uses a microprocessor to process information to/from the PCI data bus and direct hard wired inputs from the Park Brake Switch, Electronic Vehicle Information Center (EVIC), Turn Signals, and optional Navigation (NAV) buttons. The Pulse Width Modulated (PWM) dimming hard wired signal is provided by the cluster to modules and lamps that require PWM dimming. The PWM dimming hard wired Signal is created from the dimming PCI bus message sent by the BCM. The cluster will receive a "Wake-Up" signal from the BCM and a "battery" feed from the Integrated Power Module (IPM) for power control/supply, cluster PCI data bus communication with the Controller Anti-Lock Brake (CAB), BCM, EVIC, Driver Door Module (DDM), IPM, Navigation Module (NAV), Next Generation Controller (NGC combines former Powertrain Control Module and Transmission Control Module functions), Occupant Restraint Controller (ORC), Passenger Door Module (PDM), Sentry Key REmote Entry Module (SKREEM), and the scan tool [via the Data Link Connector (DLC)]. The rear camera will have a NTSC signal to the cluster. It will display the objects in the rear when the vehicle is in reverse.

Red-Green-Blue (RGB) Video data will be received from the Navigation module, for display on the Thin Filmed Transistor (TFT) screen (if equipped).

The Instrument Panel Switch Pod is the secondary part of the CIS. The switch pod will contain an Analog Clock (w/time adjust button), Hazard Switch, EVIC and NAV (optional) controls, and Vehicle Theft Security System (VTSS) LED.

The cluster has four gauges: Speedometer, tachometer, fuel, and temperature. The gauges and the LED's are not individually replaceable thereby requiring complete replacement of the Instrument Cluster if a repair is necessary. In the event that the cluster loses communication with other modules on the CAN Bus, the cluster will display "no bus" in the VF display.

The Trip/Reset button is used to switch the display from trip to total mileage. Holding the button when the display is in the trip mode will reset the trip mileage. This button is also used to put the cluster into self-diagnostic mode. The odometer display uses blue-green vacuum fluorescent digital characters. The cluster uses a vacuum-fluorescent shift indicator (PRND8) with auto-stick.

Following is a brief operation summary of the indicators and gauges of the instrument cluster:

- Charging System Indicator - This LED indicator monitors the electrical system voltage. The LED should turn on momentarily as the engine is started. If the LED stays on or turns on while driving, it indicates a problem with the charging system. Immediate service should be obtained.
- Airbag Indicator - This LED turns on and remains on for 6 to 8 seconds as a bulb check when the ignition switch is first turned ON. If the light is not on during starting, stays on, or turns on while driving, refer to the appropriate diagnostic information.
- Low Fuel Indicator - This LED indicator will illuminate when the fuel level reaches a predetermined low level of fuel and a chime will sound. It will stay lit until the fuel level is raised.
- Brake Warning Indicator - This LED indicator monitors various brake functions, including brake fluid level and parking brake application. If the LED turns on, it may indicate that the parking brake is applied or there is a low brake fluid level. The dual brake system provides a reserve braking capacity in the event of a failure to a portion of the hydraulic system. Failure of either half of the dual brake system is indicated by the Brake Warning Indicator which will turn on when the brake fluid level in the master cylinder has dropped below a specified level. The LED will remain on until the cause is corrected. The LED may flash momentarily during sharp cornering maneuvers which change fluid level conditions. The vehicle should have service performed. If brake failure is indicated, immediate repair is necessary. Vehicles equipped with ABS, are also equipped with Electronic Brake Force Distribution (EBD). In the event of an EBD failure, the Brake Warning Indicator will turn on along with the ABS Indicator. Immediate repair to the ABS system is required. The operation of the Brake Warning Indicator can be checked by turning the ignition switch from the OFF position to the ON position. The LED should illuminate for approximately two seconds. The LED should then turn off unless the parking brake is applied or a brake fault is detected. If the LED does not illuminate, refer to the appropriate diagnostic information. The LED also will turn on when the parking brake is applied with the ignition switch in the ON position. This LED shows only that the parking brake is applied. It does not show the degree of brake application.
- Front Fog Lamp Indicator - This LED indicator shows the front fog lights are ON.
- High Beam Indicator - This LED shows that the headlights are on high beam. Pull the Multi-Function lever towards the steering wheel to switch the headlights from high or low beam.
- High Engine Temperature Indicator - This LED warns of an overheated engine condition. If this LED is accompanied by a continuous chime, the engine temperature is critically hot, and the vehicle should be turned off immediately. The vehicle should be serviced as soon as possible.
- ABS Indicator - This LED monitors the ABS. The LED will turn on when the ignition switch is turned to the ON position and may stay on for as long as four seconds. If the ABS indicator remains on or turns on while driving, it indicates that the Anti-Lock portion of the brake system is not functioning and that service is required. However, the conventional brake system will continue to operate normally if the BRAKE warning indicator is not on. If the ABS indicator is on, the brake system should be serviced as soon as possible to restore the benefits of Anti-Lock brakes. If the ABS indicator does not turn on when the Ignition switch is turned to the ON position, refer to the appropriate diagnostic information.
- Malfunction Indicator - This LED indicator is part of an Onboard Diagnostic System (OBD) that monitors engine and automatic transmission control systems. The indicator will illuminate when the key is in the ON position before engine start. If the LED does not come on when turning the key from OFF to ON, have the condition checked promptly. Certain conditions such as a loose or missing gas cap, poor fuel quality, etc. may illuminate the indicator after engine start. The vehicle should be serviced if the indicator stays on through several of your typical driving cycles. In most situations the vehicle will drive normally and will not require towing. The Malfunction Indicator flashes to alert you to serious conditions that could lead to immediate loss of power or severe catalytic converter damage. The vehicle should be serviced as soon as possible if this occurs.
- Low Oil Pressure Indicator - This LED shows low engine oil pressure. The LED should turn on momentarily when the engine is started. If the LED turns on while driving, stop the vehicle and shut off the engine as soon as possible. A continuous chime will sound when this LED turns on. Do not operate the vehicle until the cause is corrected. This LED does not show how much oil is in the engine. The engine oil level must be checked under the hood.
- Seat Belt Indicator - The LED will turn on when the ignition switch is turned to the ON position as a reminder to "buckle up". The LED will remain on until the driver's [passenger as well if equipped with Occupant Classification System (OCS)] seat belt is buckled. The chime will sound for 6 seconds, or until the seat belt is buckled.
- Tire Pressure Monitor System Indicator - This LED will turn on when there is a low tire pressure condition. The LED will also turn on if a problem exists with any tire sensor. The LED will remain on until the tire pressure is properly set or the problem with the sensor is corrected. This LED will turn on monetarily as a bulb check when the engine is started.
- Traction Control/Acceleration Skid Control (ASR) Indicator - This LED indicator illuminates momentarily as a bulb check when the ignition switch is first turned ON. Extended heavy use of Traction Control/ASR may cause the system to deactivate and turn on the Traction Control/ASR Indicator. This is to prevent overheating of the brake system and is a normal condition. The system will remain disabled for about 4 minutes until the brakes have cooled. The system will automatically reactivate and turn off the Traction Control/ASR Indicator. The traction control/ASR indicator will turn on if:

- The traction control/ASR system is in use.
- The Traction Control/ASR switch has been used to turn the system OFF.
- There is a Traction Control/ASR System malfunction.
- The system has been deactivated to prevent damage to the brake system due to overheated brake temperatures.
- Turn Signal Indicators - The arrow will flash with the exterior turn signal when the turn signal lever is operated. If the vehicle electronics sense that the vehicle has traveled about 1 mile with the turn signals on, a chime will sound to alert you to turn the signals off. If either indicator flashes at a rapid rate, check for a defective outside light bulb.
- Temperature Gauge - This LED monitors the electrical system voltage. The LED should turn on momentarily as the engine is started. If the LED stays on or turns on while driving, it indicates a problem with the charging system. Immediate service should be obtained. The gauge pointer will likely indicate a higher temperature when driving in hot weather, up mountain grades, or when towing a trailer. It should not be allowed to exceed the upper limits of the normal operating range.
- Fuel Gauge - The pointer shows the level of fuel in the fuel tank when the ignition switch is in the ON position.
- Speedometer - Indicates vehicle speed.
- Tachometer - The red segments indicate the maximum permissible engine revolutions-per-minute (r.p.m. x 1000) for each gear range. Before reaching the red area, ease up on the accelerator.
- Transmission Range Indicator - This VF display indicator shows the automatic transmission gear selection.
- Auto-Stick Indicator - This VF display indicator illuminates when the gearshift lever is moved to the AutoStick position.
- Odometer/Trip Odometer - The odometer shows the total distance the vehicle has been driven. It is a Vacuum Fluorescent (VF) display. The two trip odometers show individual trip mileage. To switch from odometer to trip odometers, press and release the Trip Odometer button. To reset a trip odometer, display the desired trip odometer to be reset then push and hold the button until the display resets (approximately 2 seconds).
- Trip Odometer Button - Press this button to change the display from odometer to either of the two trip odometer settings. The word TRIP and either "A" or "B" will appear when in the trip odometer mode. Push in and hold the button for two seconds to reset the trip odometer to 0 miles or kilometers. The odometer must be in trip mode to reset.
- Cruise Indicator - This Vacuum Fluorescent (VF) display indicator shows that the Speed Control System is ON.
- Navigation Screen - Displays the current navigation system functions.
- Electronic Vehicle Information Center (EVIC) Display - When the appropriate conditions exist, this Vacuum Fluorescent (VF) display shows the EVIC messages.

ELECTRONIC VEHICLE INFORMATION CENTER

The EVIC has access to both non-switched and ignition switched sources of battery current so that some of its features remain operational at any time, while others may only operate with the ignition switch in the ON position. When the ignition switch is turned to the ON position, the EVIC display will return to the last function being displayed before the ignition was turned to the OFF position.

For more information on the features, control functions and setting procedures for the EVIC, see the owner's manual in the vehicle glove box.