For 1990-2009 cars

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.

Calibration ID: This information refers to how the BCM is calibrated. This information is for assembly plant use only.
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.
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.
Year Module Built: This information refers to the year that the BCM was built.