GM Service Manual Online
For 1990-2009 cars only
Door Lock Switch: The Door Lock Switch input displays the status of the door lock switches. Display value will be Lock/Unlock/Idle.

Door Lock Output: The Door Lock Output displays the status of the door lock (lock) relay. Display value will be On/Off.

Door Unlock Output: The Door Unlock Output displays the status of the door lock (unlock) relay. Display value will be On/Off.

Driver Unlock Output: The Driver Unlock Output displays the status of the door lock (driver unlock) relay. Display value will be On/Off.