Circuit/System Description
WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
The K9 Body Control Module provides the E7 Rear License Plate Lamp with approximately 7.5 V to the signal circuit 5797. When the switch is pressed, the K9 Body Control Module will detect the voltage drop in the signal circuit 5797 and will provide a 12 V pulse to the control circuit 6128 which will cause the M40 Rear Compartment Lid Latch to activate and release the rear compartment lid.