K9 Body Control Module
WARNING: This page is about a different car, the 2021 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
The K9 Body Control Module input circuit has an internal resistor connected to 12 V, which is the signal circuit to the S2 Transmission Manual Shift Switch. The K9 Body Control Module monitors the voltage on the circuit.