GM Service Manual Online
For 1990-2009 cars only

The theft deterrent system on this vehicle is comprised of 2 separate systems, the vehicle theft deterrent (VTD) system and the content theft deterrent (CTD) system. The VTD system prevents drive away theft by keeping the vehicle from starting. The CTD system is the vehicle alarm system which discourages unauthorized entry into the vehicle. These systems are described and diagnosed separately within this section.

Theft System Indicators

Security Indicator

The instrument panel cluster (IPC) illuminates the security indicator as determined by the content theft deterrent (CTD) system. The IPC receives a message from the theft deterrent module (TDM) or the body control module (BCM) via the serial data circuit requesting illumination.

    • The CTD system requests the IPC to illuminate the indicator only when the ignition switch is OFF. The CTD system uses the indicator in order to identify system status. For specific CTD condition that will illuminate the security indicator, refer to Content Theft Deterrent (CTD) Description and Operation .
    • The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.

Keyless Entry System

The keyless entry system functions interact with the content theft deterrent (CTD) system but is diagnosed as a stand-alone system. Refer to Keyless Entry System Description and Operation .

Radio with Theftlock

The theft deterrent system does not interact with radio theft lock equipped vehicles. Radio theft lock is diagnosed as a stand-alone system. Refer to Radio/Audio System Description and Operation .

CTD/VTD Description and Operation

    • For content theft deterrent (CTD) information, refer to Content Theft Deterrent (CTD) Description and Operation .
    • For vehicle theft deterrent (VTD) information, refer to Immobilizer Description and Operation .