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. VTD prevents drive away theft by keeping the vehicle from starting. CTD is the vehicle alarm system which discourages unauthorized entry into the vehicle. These system are described and diagnosed separately within this section.
SECURITY Telltale
The SECURITY Telltale on the instrument cluster is controlled by both the VTD System and the CTD System. The SECURITY telltale is controlled by the body control module (BCM) through the class 2 data line.
| • | The VTD System contained in the BCM commands the instrument cluster to control the SECURITY telltale only when the ignition switch is ON. The VTD System uses the telltale as a malfunction indicator. |
| • | The CTD System also contained in the BCM commands the instrument cluster to control the indicator only when the ignition switch is OFF. The CTD System uses the SECURITY telltale to identify system status. |
Theft Lock Radio (if applicable)
Refer to Diagnostic Starting Point - Entertainment in Entertainment.
CTD/VTD Description and Operation
Refer to the following for the appropriate description and operation:
