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Body Control Module (BCM)

Battery 1: The scan tool displays 0.0-25.5 V. This parameter is the system voltage measured by the BCM at the BCM battery input.
Shifter Unlock Fdbk: The scan tool displays High/Low. This parameter indicates Low when the mechanical lock is engaged preventing an inadvertent shift out of the PARK position. The Display indicates High when BCM opens the controlled ground circuit of the shift lock control solenoid.