Circuit/System Description
WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
The rear compartment lid can be released by holding either front power door lock switch to the unlock position for a minimum of 2 seconds or by pressing the rear compartment release button on the key fob. The transaxle must be in the PARK position for the rear compartment to release. When the rear compartment lid release is commanded, voltage is applied to the rear compartment lid release actuator from the BCM, thus opening the rear compartment.