Vehicle Theft Alarm

Vehicles equipped with the export premium version of the Vehicle Theft Alarm (VTA) provide some preliminary diagnostic feedback by illuminating the security indicator located in the Electromechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN). If the security indicator illuminates with the ignition switch in the ON position, it indicates that there is a communication problem between the intrusion module and the EMIC, or between the intrusion module and the siren module. The EMIC will also turn ON the security indicator if it receives a message from the intrusion module indicating that a Diagnostic Trouble Code (DTC) has been stored for a siren module fault.

The hard wired circuits between components related to the VTA system may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.

However, conventional diagnostic methods will not prove conclusive in the diagnosis of the VTA system or the electronic controls or communication between other modules and devices that provide some features of the VTA system. The most reliable, efficient, and accurate means to diagnose the VTA system or the electronic controls and communication related to VTA system operation requires the use of a diagnostic scan tool. See the VEHICLE THEFT SECURITY SYSTEM menu item on the scan tool. Refer to the appropriate diagnostic information.