Envoy 2WD L6-4.2L (2008)
Alarm Module: Testing and Inspection
Security Indicator Malfunction
Security Indicator Malfunction
Diagnostic Instructions
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Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. See: Testing and Inspection/Initial Inspection and
Diagnostic Overview/Diagnostic System Check - Vehicle
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Review Strategy Based Diagnosis for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions provide an overview of each diagnostic category.
Circuit/System Description
The security indicator acts as a status indicator for the content theft deterrent (CTD) system when the ignition is OFF and as a fault indicator for the
immobilizer system when the ignition is ON. When either the body control module (BCM) or theft deterrent module (TDM) requires the security
indicator to be illuminated, a serial data message is sent to the instrument panel cluster (IPC), which will illuminate the indicator.
Circuit/System Verification
Ignition ON, verify the security indicator illuminates when performing the scan tool IPC Display Test.
If the security indicator does not illuminate, replace the IPC.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures/Verification Tests and Procedures
