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 B27LF Front Side Door Outside Handle Switch - Left with approximately 7.5 V to the signal circuit 2674. Ground is applied at all times to the B27LF Front Side Door Outside Handle Switch - Left. When the switch is pressed, ground is applied to the K9 Body control Module through signal circuit 2674. The K9 Body Control Module will detect the voltage drop in the signal circuit 2674 and will command the doors to perform the LOCK/UNLOCK command.