Circuit/System Description
WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
The pump motor is an integral part of the brake pressure modulator valve, while the pump motor relay is integral to the electronic brake control module (EBCM). The pump motor relay is not engaged during normal system operation. When the ABS, the traction control system, or the stability control operation is required the EBCM activates the pump motor relay and turns the pump motor ON.