GM Service Manual Online
For 1990-2009 cars only
Arming Status: The scan tool displays Active/Inactive. The scan tool will display active when the content theft deterrent (CTD) system is armed.

Content Theft Mode: The scan tool displays Ignition On/Arm Pending/Standby/Sim. Arm. Pend./Trunk Open/Unlocked/Open/Locked/Ignition Lock/Sim. Armed/Armed/Warn Away/Alarm/Audible Only. The scan tool will displays the current state of the CTD system.

CTD Status: The scan tool displays Armed/Disarmed. The scan tool will display Armed when the CTD system is armed.

Door Ajar Switch: The scan tool displays Door Closed/Door Ajar. The scan tool displays the status of the right front, right rear, and left read doors and will display Door Ajar when any of these doors are ajar.

Door Cylinder Switch: The scan tool displays Idle/Lock/Unlock. The scan tool will display the position of the door key cylinder switch.

Door Cylinder Switch: The scan tool displays the current voltage at the door cylinder switch.

Driver Door Ajar Switch: The scan tool displays Door Closed/Door Ajar. The scan tool will display Door Ajar when the drivers front door is ajar.

Horn Relay Command: The scan tool displays On/Off. The scan tool will display On when the horn is commanded on.

Security Indicator Command: The scan tool displays On/Off. The scan tools displays On if the SECURITY telltale is illuminated.

Trunk Ajar Switch: The scan tool displays Trunk Closed/Trunk Ajar. The scan tool will display Trunk Ajar when the truck is open.