GM Service Manual Online
For 1990-2009 cars only
Valet Switch: The scan tool displays Active/Inactive. The scan tool displays active when in valet mode.

Hatch/Trunk Release Switch: The scan tool displays Active/Inactive. The scan tool displays active when the hatch/trunk release switch is depressed.

Hatch/Trunk Release Solenoid: The scan tool displays Active/Inactive. The scan tool will display the state of the rear compartment lid.