Colorado 2WD L4-2.8L VIN 8 (2004)
Security Lamp/Indicator: Description and Operation
SECURITY INDICATOR
The SECURITY indicator on the instrument cluster is controlled by both the VTD system and the CTD system. The SECURITY indicator is an LED on
the instrument cluster which illuminates the word SECURITY. The SECURITY indicator is controlled by the body control module (BCM) grounding the
security indicator control circuit.
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The VTD system commands the instrument cluster to control the indicator only when the ignition switch is ON. The VTD system uses the
indicator as a malfunction indicator.
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The CTD system commands the instrument cluster to control the indicator only when the ignition switch is OFF. The CTD system uses the
indicator to identify system status.
The instrument panel cluster (IPC) illuminates the security indicator as determined by the theft deterrent system. The security indicator is illuminated
when the body control module (BCM) provides a ground on the security indicator control circuit.
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The vehicle theft deterrent (VTD) system requests the IPC to illuminate the indicator only when the ignition switch is ON.
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The content theft deterrent (CTD) system requests the IPC to illuminate the indicator only when the ignition switch is in the OFF or ACC positions
or during retained accessory power (RAP).
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The BCM performs the displays test at the start of each ignition cycle. The indicator illuminates for approximately 3 seconds.
