The air bag indicator is a light emitting diode (LED) display that is located in the instrument cluster. The air bag indicator is operated by the inflatable restraint sensing diagnostic module (SDM) Module. The air bag indicator FLASHES 7 times when the ignition switch is turned to the RUN position. The SDM module sends a Class 2 serial data message to the instrument cluster to inform the instrument cluster when to turn ON the air bag indicator.

The air bag indicator will also turn ON when one of the following actions occurs:

The anti-lock indicator is a LED display that is located in the instrument cluster. The anti-lock indicator is operated by the electronic brake control module (EBCM) module. The instrument cluster turns ON the anti-lock indicator for 3 seconds when the ignition switch is turned to the RUN position. The EBCM module then sends a class 2 serial data message to the instrument cluster to turn OFF the anti-lock indicator as soon as the 3 second bulb check is complete.

The anti-lock indicator will also turn ON when one of the following actions occurs:

The red brake indicator also turns ON for 3 seconds when the ignition switch is turned to the RUN position. Both the BCM and the EBCM can instruct the instrument cluster to turn ON the red brake indicator. The EBCM module will request the instrument cluster to turn the red brake indicator ON when one of the following actions occurs:

The red brake warning indicator is a LED display that is located in the instrument cluster. The red brake warning indicator is operated by the EBCM module and by the BCM. The red brake warning indicator is used to indicate when a brake system failure occurs or when the parking brake is set.

The red brake warning indicator turns ON when one of the following actions occurs:

Refer to Brake Warning System Description in Hydraulic Brakes for more information about the base brake system.

The battery indicator is a LED display that is located in the instrument cluster. The VCM sends a class 2 serial data message to the instrument cluster in order to instruct the instrument cluster when to turn ON or when to turn OFF the battery indicator. When the ignition switch is turned from the OFF position to the UNLOCK position the battery indicator will turn ON. The battery indicator will remain ON while the ignition switch is moved from UNLOCK position to RUN position. The battery indicator will remain ON until the ignition switch is turned to the CRANK position and back to the RUN position. Once the ignition switch is RELEASED to the RUN position after the ignition switch was just in the CRANK position the instrument cluster will turn the battery indicator ON for 3 seconds. The instrument cluster will then respond to the last Class 2 serial data message received from the VCM. The VCM will order the instrument cluster to turn the battery indicator OFF if the generator is charging. A diagnostic trouble code (DTC) will be stored in the VCM related to the system malfunction.

The check gauges indicator is a LED display located in the instrument cluster. The check gauges indicator turns ON for 3 seconds when the ignition switch is turned to the RUN position. The instrument cluster is constantly monitoring the engine coolant temperature and engine oil pressure when the engine s running. The engine coolant temperature information is sent to the instrument cluster over the Class 2 serial data line by the VCM. The engine oil pressure information is sent to the instrument cluster from a designated circuit connected to the oil pressure sensor. The instrument cluster will turn the CHECK GAUGES indicator ON if the engine coolant temperature gets too high or if the engine oil pressure gets too low while the engine is running.

The gate ajar indicator display is a LED display that is located in the instrument cluster. The gate ajar indicator turns ON when the instrument cluster receives a Class 2 serial data message from the body control module (BCM) requesting that the gate ajar indicator be turned ON.

The high beam indicator is a replaceable lamp that is located in the instrument cluster. The BCM sends a class 2 serial data message to the instrument cluster to instruct the instrument cluster when to turn ON or when to turn OFF the high beam indicator. If the BCM detects that the high beams are ON, the BCM will instruct the instrument cluster to turn ON the high beam indicator.

The low fuel indicator is a LED display is that is located in the instrument cluster. The low fuel indicator will turn ON for 3 seconds when the ignition switch is turned to the RUN position. When the ignition switch is in the RUN position, the VCM constantly sends a Percent of Fuel Remaining message over the class 2 serial data line to the instrument cluster in order to display the appropriate fuel level. The instrument cluster uses the fuel level information from the VCM in order to operate the fuel gauge. The information is also used in order to determine when the low fuel indicator should be turned ON.

The overspeed indicator is a LED display that is located in the instrument cluster. The BCM sends a class 2 serial data message to the instrument cluster in order to inform the instrument cluster when to turn ON the overspeed indicator. The overspeed indicator will turn ON for 3 seconds when one of the following actions occurs:

The service 4WD indicator is a LED display located in the instrument cluster. The Automatic Transfer Case (ATC) module sends a class 2 serial data message to the instrument cluster to instruct the instrument cluster when to turn ON the service 4WD indicator.

The service 4WD indicator will also turn ON when one of the following actions occurs:

The seat belt indicator is a LED display located in the instrument cluster. The BCM sends a class 2 serial data message to the instrument cluster in order to inform the instrument cluster when to turn ON the seat belt indicator. The seat belt system has an enhanced seat belt warning system. The system activates the following components when the ignition has been turned to the RUN position and the driver's seat belt has not been buckled:

The seat belt warning lamp will be ON constant for the first 20 seconds and will FLASH for the remaining 55 seconds. The audible warning will stay ON when the driver seat belt is not fastened during the 8 second time period. The sequence of operation of the warning lamp and audible warning follows:

The Driver Seat Belt Is Unbuckled.

1. Turn the ignition switch to the RUN position.
2. The seat belt indicator turns ON constantly for 20 seconds.

The seat belt audible warning turns ON and stays ON for 8 seconds, then turns OFF.

3. The seat belt indicator FLASHES for the remaining 55 seconds.
4. If the driver seat belt buckle is buckled before the 8 second period is over, the audible warning and the seat belt indicator will turn OFF.

The Driver Seat Belt Is Buckled.

1. Turn the ignition switch to the RUN position.
2. The seat belt indicator turns ON for 75 seconds.

The seat belt audible warning will not turn ON.

3. The seat belt indicator turns OFF after 75 seconds.
4. If the driver seat belt buckle is unbuckled during the first 8 seconds, the seat belt audible warning will turn ON for the remainder of the 8 second delay.

The security indicator is a LED display that is located in the instrument cluster. The BCM sends a class 2 serial data message to the instrument cluster in order to inform the instrument cluster when to turn ON or FLASH the security indicator. If the security indicator is ON a DTC will be stored related to the system malfunction.

The service engine soon indicator, or the malfunction indicator lamp (MIL), is a LED display located in the instrument cluster. The service engine soon indicator is controlled directly by the VCM. The service engine soon indicator should turn ON when the ignition switch is in the RUN position and the engine is OFF. The service engine soon indicator should turn OFF 1-5 seconds after the engine starts. Service to the emission control system or service the engine control system may be required if the service engine soon indicator stays ON or turns ON while driving. If the service engine soon indicator is ON with the engine running a DTC will be stored related to the system malfunction.

The turn signal indicator is a replaceable lamp that is located in the instrument cluster. The turn signal indicators are directly operated by the turn signal switch and the turn signal flasher. The turn signal indicators do not turn ON during the bulb check or when the ignition switch is in the run position. Refer to Lighting Systems for more information about the turn signals.

The PRNDL display is a class 2 serial data message to the instrument cluster from the VCM. The PRNDL display is a vacuum florescent (VF) display which displays the fixed gear position of P, R, N, D, 3, 2, 1 surrounded by a moveable square flag in order to indicate the selected gear position. The position of the moveable square flag is sent to the instrument cluster from the transmission range switch over the class 2 serial data line. The transmission range switch and the neutral safety back up (NSBU) switch operate separately but are incorporated into one part. Since the system is entirely electronic, there is not any internal adjustment. The PRNDL display will operate as follows:

The purpose of illuminating the instrument cluster PRNDL display and indicator displays during the power up of the instrument cluster is to verify that all segments of the PRNDL display and that all of the indicator displays are working properly. The turn signal indicators do not turn ON during the bulb check. If an expected indicator or PRNDL segment does not function properly during the bulb check further diagnosis of the instrument cluster may be necessary. Refer to Diagnostic System Check - Instrument Cluster .