Scan Tool Data Definitions - Outputs

CHECK GAUGES LAMP
Range: ON/OFF
This output refers to the commanded state of the CHECK GAUGES indicator.

ON is displayed when the instrument cluster is commanding the CHECK GAUGES indicator to turn ON.

The instrument cluster will command the CHECK GAUGES indicator to turn ON when one of the following conditions exist:
^ The instrument cluster receives a high engine coolant temperature (120°C or 248°F) from the VCM/PCM over the Class 2 data line and the engine is running.
^ The instrument cluster receives a low oil pressure signal (less than 5 ohm) from the oil pressure sender and the engine is running.
^ During the bulb check period. The bulb check will begin once the ignition switch is first turned to RUN position, and will last for 3 seconds.

OFF is displayed when the instrument cluster is not commanding the CHECK GAUGES indicator to turn ON.

LOW FUEL LAMP
Range: ON/OFF
This output refers to the commanded state of the LOW FUEL indicator. ON is displayed when the instrument cluster is commanding the LOW FUEL indicator ON. OFF is displayed when the instrument cluster is not commanding the LOW FUEL indicator ON. The instrument cluster will command the LOW FUEL indicator ON under the following conditions:
^ When the instrument cluster receives a class 2 (percent monitored fuel level) message of less than 19.2 percent from the VCM/PCM. Once the indicator is ON, the Monitored Fuel Level must rise above 23 percent in order to turn the indicator OFF.
^ During the bulb check period. The bulb check will begin once the ignition switch is first turned to RUN position, and will last for 3 seconds.
^ A class 2 communication failure has occurred between the instrument cluster and the VCM/PCM.

SERVICE 4WD
Range: ON/OFF
This output refers to the commanded state of the SERVICE 4WD indicator. ON is displayed when the instrument cluster is commanding the SERVICE 4WD indicator ON. The instrument cluster commands the SERVICE 4WD indicator ON when it receives a class 2 serial data message from the Automatic Transfer Case (ATC) module requesting the SERVICE 4WD indicator ON. OFF is displayed when the ATC module is not commanding the instrument cluster to turn the SERVICE 4WD indicator ON. The instrument cluster will also command the SERVICE 4WD indicator ON when one of the following conditions exist:
^ The instrument cluster receives a class 2 serial data message from the ATC module indicating a 4WD malfunction
A class 2 communication failure has occurred between the instrument cluster and the ATC module
^ A DTC is set related to the 4WD system

OVERSPEED LAMP
Range: ON/OFF
This output refers to the OVERSPEED indicator. ON is displayed when the instrument cluster is commanding the OVERSPEED indicator to FLASH because a class 2 serial data message is received from the VCM/PCM.

OFF is displayed when the instrument cluster is not commanding the OVERSPEED indicator to FLASH.

ANTI-LOCK BRAKE SYSTEM (ABS) LAMP
Range: ON/OFF
This output refers to the commanded state of the ABS indicator. ON is displayed when the instrument cluster is commanding the ABS indicator to turn ON. OFF is displayed when the instrument cluster is not commanding the ABS indicator to turn ON. The instrument cluster will command the ABS indicator to turn ON under the following conditions:
^ The instrument cluster receives a class 2 serial data message from the Electronic Brake Control Module (EBCM) indicating there is a malfunction in the ABS system
^ During the bulb check period. The bulb check will begin once the ignition switch is first turned to RUN position, and will last for 3 seconds.
^ A class 2 communication failure occurs.
^ A Diagnostic Trouble Code (DTC) is stored related to the system malfunction.

BRAKE LAMP
Range: ON/OFF
This output refers to the commanded state of the red BRAKE indicator. ON is displayed when the instrument cluster is commanding the red BRAKE indicator to turn ON. OFF is displayed when the instrument cluster is not commanding the red BRAKE indicator to turn ON. The instrument cluster will command the red BRAKE indicator to turn ON under the following conditions:
^ The red BRAKE indicator will FLASH when the instrument cluster receives a class 2 serial data message from the Body Control Module (BCM) that indicates the parking brake is set.
^ The instrument cluster receives a class 2 serial data message from the Electronic Brake Control Module (EBCM) indicating that there is a problem with the base brake system (non-ABS portion).
^ During the bulb check period. The bulb check will begin once the ignition switch is first turned to RUN position, and will last for 3 seconds.

FASTEN SEAT BELTS
Range: ON/OFF
This output refers to the commanded state of the fasten seat belts indicator. ON is displayed when the instrument cluster is commanding the fasten seat belts indicator to turn ON. OFF is displayed when the instrument cluster is not commanding the fasten seat belts indicator to turn ON. The instrument cluster will command the fasten seat belts indicator to turn ON under the following conditions:
^ The fasten seat belt indicator will turn ON for 20 seconds followed by 55 seconds of FLASHING when it receives a class 2 serial data message from the Body Control Module (BCM) that indicates the drivers seat belt is not buckled.
^ During the bulb check period for about 3 seconds after the ignition switch is first turned to the RUN position providing the drivers seat belt is not buckled. If the seat belt is buckled when the ignition switch is turned to the RUN position, the seat belt indicator will remain OFF.
^ If a class 2 communication failure occurs, the fasten seat belt indicator will turn ON for 20 seconds followed by 55 seconds of FLASHING.

SECURITY LAMP
Range: ON/OFF
This output refers to the commanded state of the SECURITY indicator. ON is displayed when the instrument cluster is commanding the SECURITY indicator ON. OFF is displayed when the instrument cluster is not commanding the SECURITY indicator ON. The instrument cluster will command the SECURITY indicator to turn ON under the following conditions:
^ During the bulb check period. The bulb check will begin once the ignition switch is first turned to RUN position, and will last for 3 seconds.
^ When the instrument cluster receives a class 2 serial data message from the (BCM).
^ A class 2 communication failure occurs and the ignition switch in the RUN position.

UPSHIFT LAMP (MANUAL TRANSMISSION VEHICLE ONLY)
Range: ON/OFF
This output refers to the commanded state of the UPSHIFT indicator. ON is displayed when the instrument cluster is commanding the UPSHIFT indicator to turn ON. OFF is displayed when the instrument cluster is not commanding the UPSHIFT indicator to turn ON. The instrument cluster will turn ON the upshift indicator when the instrument cluster receives a class 2 serial data message from the PCM/VCM.

HIGH BEAM LAMP
Range: ON/OFF
This output refers to the commanded state of the high beam lamp. ON is displayed when the instrument cluster is commanding the high beam lamp to turn ON. OFF is displayed when the instrument cluster is not commanding the high beam lamp to turn ON. The instrument cluster will turn ON the high beam lamp when the instrument cluster receives a class 2 serial data message from the Body Control Module (BCM).

BATTERY
Range: ON/OFF
This output refers to the commanded state of the battery (voltage) indicator. ON is displayed when the instrument cluster is commanding the battery indicator ON. OFF is displayed when the instrument cluster is not commanding the battery indicator ON. The instrument cluster will command the battery indicator ON under the following conditions:
^ The instrument cluster receives a class 2 serial data message from the PCM/VCM indicating that there is a charging system problem.
^ The ignition switch is turned to UNLOCK or RUN without the engine running.
^ A class 2 communication failure occurs.
^ During a 3 second bulb check after the engine has been started.

REAR GATE/DOOR AJAR
Range: OPEN/CLOSED
This output refers to the commanded state of the GATE AJAR indicator. ON is displayed when the instrument cluster receives a class 2 serial data message from the Body Control Module (BCM) requesting the instrument cluster to turn the GATE AJAR indicator ON. OFF is displayed when the instrument cluster does not receive a class 2 serial data message from the BCM requesting the instrument cluster to turn the GATE AJAR indicator ON.

TOW/HAUL LAMP
Range: ON/OFF
This output refers to the commanded state of the TOW/HAUL indicator. ON is displayed when the instrument cluster is commanding the TOW/HAUL indicator ON. OFF is displayed when the instrument cluster is not commanding the TOW/HAUL indicator ON. The BCM monitors the TOW/HAUL switch. When the BCM detects the TOW/HAUL switch was depressed it sends a class 2 serial data message to the instrument cluster. The instrument cluster will then command the TOW/HAUL indicator ON.

AIR BAG LAMP
Range: ON/OFF
This output refers to the commanded state of the Air Bag indicator. The Air Bag indicator is controlled by a class 2 serial data message from the inflatable restraint Sensing Diagnostic Module (SDM) module. ON is displayed when the SDM module sends a class 2 serial data message to the instrument cluster commanding the Air Bag indicator ON. OFF is displayed when the SDM module does not send a class 2 serial data message to the instrument cluster commanding the Air Bag indicator ON.

SERVICE ENGINE SOON LAMP
Range: ON/OFF
This output refers to the commanded state of the Service Engine Soon indicator. The Service Engine Soon indicator is controlled by a discrete wire from the PCM/VCM. ON is displayed when the VCM/PCM grounds CKT 419. OFF is displayed when the VCM/PCM does not ground CKT 419.