Circuit/System Description
WARNING: This page is about a different car, the 2012 Buick Verano. However, it is still accessible from the selected car via links, so may be relevant.
The body control module (BCM) applies battery positive voltage to the lift glass/trunk motor release control circuit, which energizes the coil side of the rear compartment lid release relay. The switch side of the rear compartment lid release then closes, supplying battery positive voltage through the relay and the relay controlled output circuit to the rear compartment lid latch. The rear compartment lid latch then releases the trunk lid so that it may be manually raised to an open position.