The CTD system uses the door jamb switches in the door lock assembly as one method to activate the alarm. The Driver Door Module (DDM) monitors all door jamb switches via a discrete input or the Simple Bus Interface (SBI) from the other three door modules. If the RIM receives a class 2 message from the DDM that a door is open and the CTD system is armed, RIM activates the alarm.

When the hood is opened the switch closes. When the DIM detects the hood ajar switch in a closed condition and the CTD system is armed, the RIM activates the alarm. Upon receiving the DIM class 2 message.

The rear compartment lid is equipped with an ajar switch. Any opening of the rear compartment caused by a forced entry, result in the switch closing. When the RIM detects the rear compartment ajar switch in a closed condition and the CTD system is armed, the RIM activates the alarm.

The RKE system can arm and disarm the CTD system. When the RKE module receives a door lock or unlock signal from the transmitter, the RKE module sends a class 2 message to the RIM to perform the appropriate arm/disarm functions.

The CTD system is an internal function of the Rear Integration Module (RIM) which utilizes class 2 serial data and various switch input information to perform CTD functions. When the RIM detects an unauthorized entry it commands the Dash Integration Module (DIM) to activate the horns and exterior lamps via the class 2 serial data line. The RIM has five basic modes (disarmed, standby, delayed, armed, and alarm) for operating the CTD system. The different modes are described below.

1. The RIM has the CTD system in a disarmed mode until the following conditions are detected:

•	Ignition key turned to the OFF position.

•	Any door open.

2. The RIM enters the standby mode when the above conditions are detected. In standby mode the RIM commands the instrument cluster to flash the SECURITY indicator via the class 2 serial data line. (If all the doors are closed and the LOCK button on the transmitter is used, the RIM enters the delayed mode (step 3).
3. When the last door, rear compartment lid, or hood (export) is closed, the RIM enters the delayed mode for 30 seconds. In delayed mode the RIM commands the instrument cluster to illuminate (stop flashing) the SECURITY indicator via the class 2 serial data line.
4. After 30 seconds, the RIM enters the armed mode. In armed mode the RIM commands the instrument cluster to turn off the SECURITY indicator via the class 2 serial data line. Any forced entry activates the alarm mode.
5. When the RIM detects a forced entry, the RIM enters the alarm mode. The RIM commands the DIM to activate the horn and exterior lamps for 30 seconds, via a class 2 message.

Important: The CTD system can be armed with the windows or sunroof open.

The RIM monitors the following inputs:

The RIM commands the DIM to control the following via a class 2 message: