GM Service Manual Online
For 1990-2009 cars only
Battery Voltage: The scan tool displays 0.0-16.0 volts. The battery voltage input represents the system voltage measured at the body control module (BCM) ignition feed input.

Calibration ID: The scan tool displays the calibration ID.

Component Serial No.: The scan tool displays the component serial number.

Driver/Pass./Left Rear/Rt. Rear Door Jamb Sw.: Input from the respecting door indicating door status.

Ignition Accessory/Run: Input from ignition switch Accessory circuit. Used to determine power mode. Active in ACC and ON.

Ignition Switch: The scan tool displays Off/RAP/Accy./Run/Crank. The power mode is mapped to this input.

Ignition 1 Run/Crank: Input to the control module from the ignition switch indicating the Ignition 1 position. Active in ignition switch positions ON and START.

Key in Ignition: Input from ignition switch indicating that the ignition key is inserted into the ignition switch.

Julian Date of Build: The day of the year when module was built.

PROM ID: The scan tool displays the PROM ID.

Year Module Built: The year when module was built.

8-Digit GM Part Number: The module's part number.