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Theft Deterrent Alarm Malfunction — Alarm SirenDiagnostic Instructions
Diagnostic Fault Information
Circuit/System DescriptionThe alarm siren monitors the alarm enable signal circuit and will sound an audible alarm when the body control module indicates a event has occurred that requires an alarm. The alarm siren also monitors its own voltage circuits independent of the body control module. In the event of the interruption of voltage to the alarm siren, the alarm will sound. Reference InformationSchematic ReferenceTheft Deterrent System Schematics Connector End View ReferenceDescription and OperationContent Theft Deterrent (CTD) Description and Operation Electrical Information ReferenceScan Tool ReferenceControl Module References for scan tool information Circuit/System VerificationIgnition ON, command the Alarm Siren ON and OFF with a scan tool. Listen and feel for the KR101 theft deterrent security siren relay to turn ON and OFF. Circuit/System Testing
If the test lamp illuminates, test the control circuit for a short to voltage. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test or replace the KR101 theft deterrent security siren relay. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal 85 for a short to ground. If the circuit tests normal, test or replace the KR101 theft deterrent security siren relay. If greater than the specified range, test the ground circuit for an open/high resistance. If the alarm siren does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the P4 security siren. If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K9 body control module. If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 body control module. Component TestingRelay Test
If not within the specified range, replace the KR101 theft deterrent security siren relay.
If not the specified value, replace the KR101 theft deterrent security siren relay. If greater than the specified range, replace the KR101 theft deterrent security siren relay. Repair InstructionsPerform the Diagnostic Repair Verification after completing the diagnostic procedure.
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