Circuit/System Description
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The shock sensor is a component of the content theft deterrent (CTD) system which monitors the vehicle for shock impacts. The shock sensor provides an alarm signal to the body control module (BCM) in the event that the vehicle is being tampered with. The sensor ground is controlled through a switched ground from the BCM. By providing ground from the BCM the sensor is powered-up and activated.