Body Control Module (BCM)

Battery Voltage: The scan tool displays 0.0-16.0 volts. The battery voltage input represents the system voltage measured at the BCM ignition feed input.

GM Part Number: The scan tool displays the 8-digit alphanumeric module part number.

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

Ignition 0: Input to the control module from the ignition switch indicating the ignition 0 position. Switch closed (HOT) in ignition switch positions UNLOCK, ACC, ON, and START.

Ignition 1: Input to the control module from the ignition switch indicating the ignition 1 position. Switch closed (HOT) in ignition switch positions ON and START.

Ignition 3: Input to the control module from the ignition switch indicating the ignition 3 position. Switch closed (HOT) in ignition switch position ON.

Julian Date of Build: This is the day of the year that the module was built.

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

SWC Switch Voltage: Indicates the steering wheel controls supply voltage.

SWC Switch Power: Indicates if voltage is supplied to the steering wheel controls.

Year Module Built: This is the year that the module was built.