GM Service Manual Online
For 1990-2009 cars only
Fuel Door Lock Relay: The scan tool displays ON/OFF. The fuel door will lock with a lock command.

Fuel Door Unlock Relay: The scan tool displays ON/OFF. The fuel door is released when commanded open.

Trunk Ajar Switch: The scan tool displays ON/OFF. The scan tool displays ON when the trunk is open.

Trunk Release Output: The scan tool displays ON/OFF. The trunk is released when commanded open.

Trunk Release Switch: The scan tool displays ON/OFF. The IPM will display the state of the rear compartment lid.