Scan Tool Data Definitions

Use the Scan Tool Data Display Values and Definitions Information in order to assist in diagnosing vehicle malfunctions. Compare the vehicles actual scan tool data with the typical data display value table information. Use the data information in order to aid in understanding the nature of the problem when the vehicle does not match with the typical data display values.

The scan tool data values were taken from a known good vehicle under the following conditions:
^ The ignition switch is in the ON position.
^ The engine is not running.
^ The vehicle is in PARK.

A/C clutch Mode: The BCM uses this data to determine if the A/C Clutch is energized or not.

A/C Request: The BCM uses this input to determine the position of the air conditioning switch. YES is displayed when A/C is requested.

Calibration ID: This information refers to how the BCM is calibrated. This information is for assembly plant use only.

Coolant level: This input to the BCM is used to determine the level of engine coolant.

Ignition 0: The BCM uses this data in order to determine the position of the ignition switch. Active is displayed when the ignition switch is in the ON or ACCY position.

Ignition 1: The BCM uses this data in order to determine the position of the ignition switch. Active is displayed when the ignition switch is in the ON or CRANK position.

Ignition 3: The BCM uses this data in order to determine the position of the ignition switch. Active is displayed when the ignition switch is in the Run position.

Key In Ignition: This information refers to whether or not the ignition key is inserted into the ignition switch. The BCM uses this data to perform chime functions. YES is displayed when the key is inserted into the ignition switch.

Seatbelt: This input to the BCM is used to discriminate between the use or lack of use of the drivers seatbelt.

Traction Switch: The BCM uses this input to determine the position of the traction control switch. ON is displayed when the enhanced traction system is active.

Park Brake Switch: The BCM uses this input to determine the position of the rear park brake switch. ON is displayed when the park brake is applied.

Panic Horn Relay: This output displays whether or not the BCM is providing ground for the horn relay. ON is displayed when the BCM is providing ground for the relay.

Last 4 Dig. of GM Part #: This information refers to the last 4 digits of the GM BCM part number that is currently in the vehicle.

Oil Life/TIM Reset Switch: This input to the BCM is used to reset the Oil pressure / Tire pressure monitor.

Washer Fluid Level: This BCM input monitors windshield washer fluid level.

Year Module Built: This information refers to the year that the BCM was built.