Use the scan tool data display values and definitions in order to assist in diagnosing vehicle malfunctions. Compare the vehicle's actual scan tool data with the typical data value in the table. Use the definitions information to aid in understanding the nature of the concern when the vehicle data display does not match the typical data values. Refer to Scan Tool Data List .

The typical scan tool data values were taken from a known good vehicle under the following conditions:

Accessory: The body control module (BCM) uses this data in order to determine the position of the ignition switch. ON is displayed when the ignition switch is in the ON or ACCY position.

Battery Voltage: This voltage value refers to the battery system voltage.

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

Driver Door Ajar Sw.: The scan tool displays On/Off. On is displayed when the driver door is open, Off when closed.

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

Last 4 Dig of GM Part No.: This information refers to the last 4 digits of the GM BCM part number that is currently in the vehicle.

Last 4 Digits of SDM Part Number: This information refers to the last 4 digits of the GM SDM part number that is currently in the vehicle.

Model Year: This information refers to the model year of the vehicle.

Passenger Door Ajar Sw.: The scan tool displays On/Off. On is displayed when at least one passenger door is open, Off when all passenger doors are closed.

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