The Content Theft Deterrent (CTD) system is a subsystem of the Body Control Module (BCM). The BCM provides all logic necessary to operate the theft deterrent system. The BCM also sends and receives information from other systems to perform theft deterrent functions, therefore, it is important to become familiar with general operation of the BCM and how the BCM sends and receives information from other systems to execute theft deterrent functions. Use a scan tool in order to diagnose the theft deterrent system when referred to in diagnostic procedures. In addition to displaying DTCs, the scan tool can be used to display BCM input status and the data values used. The scan tool can also be used to instruct the BCM to command many theft deterrent subsystems ON or OFF. Any of these features can be selected using the scan tool. Become very familiar with the BCM capabilities and diagnostic features. These self-diagnostic features are referenced in the DTC tables and are very useful in diagnosing non-DTC setting malfunctions as well. Most system malfunctions are traceable to faulty wiring and connectors, and occasionally components. Using a scan tool to display data while moving wiring or connector can help diagnose an intermittent malfunction. For the BCM to provide theft deterrent functions, the BCM relies on other systems to provide information that is not a direct input to the BCM. This information can be received either by a direct circuit to the BCM, or by a specific message to the BCM on the serial data line. The following table describes input and output information the BCM uses to perform theft deterrent functions and how the BCM receives this information:

To test operation of the theft deterrent system, an illegal entry can be simulated. Perform the theft deterrent test as follows:

1. Ensure hatch or trunk is closed and latched.
2. Close the hood (export only).
3. Sit in driver's seat with doors closed.
4. Turn ON the ignition switch.
5. Open a window with power window switch.
6. Turn OFF the park/headlamps.
7. Turn OFF the ignition and remove the ignition key.
8. Open door to exit vehicle; SECURITY lamp should be flashing.
9. Lock doors using power lock switch; SECURITY lamp should be ON continuously (not flashing).
10. Exit vehicle and close door; SECURITY lamp should go out in 2-3 seconds.
11. Reach through open window and unlock doors using either manual locks or power unlock switch.
12. Open door; alarm should activate.
13. Disarm theft deterrent alarm mode by either unlocking the driver or passenger door by using the door lock cylinder, turn the ignition ON with a valid PASS-Key®, or press the unlock button on the remote door lock transmitter.

If the theft deterrent system does not operate as described above, check the operation of the following items using a scan tool:

If the above items check OK, cycle the horn and/or lights (fog, backup, turn signals) output through the BCM output control functions, or the SECURITY indicator through the IPC output control functions using a scan tool. These systems must be diagnosed first before diagnosing the theft deterrent system.