SECURITY Telltale
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
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.