Circuit/System Description
WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.
The K9 Body Control Module provides the S33 Steering Wheel Horn Contact with approximately 7.5V to the signal circuit 3287. When the switch is pressed, the K9 Body Control Module will detect the voltage drop in the signal circuit 3287 and will command the KR3 Horn Relay to energize.